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  • 550 - Earth sciences  (20)
  • 551.7
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  • English  (16)
  • German  (6)
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  • 2000-2004  (21)
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  • 1
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    Interpreting climate proxies from tree-rings (2004)
    In:  The Climate in Historical Times : Towards a Synthesis of Holocene Proxy Data and Climate Models | GKSS School of Environmental Research
    Details
    Publication Date: 2020-02-12
    Description: Trees, as long living plants, are governed by environmental and/or climate changes within their habitat. Their growth rings record to a large extent the temporal dynamics of these changes either directly or through tree physiological reactions. They render the highest time resolution thus far possible for environmental or climate reconstructions of the past 10,000 years (exactly dated, annually resolved, see: [828], [994]). Trees are a substantial part of the human environment with a high socio-economic value. Their large geographical extension over various regions of the world, including those with greatest population densities but also marginal areas allows to gain unique informations about local and regional consequences of global climate change.
    Keywords: 550 - Earth sciences
    Language: English
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  • 2
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    Three-dimensional viscoelastic finite element model for post-seismic deformation of the great 1960 Chile earthquake (2004)
    In:  Journal of Geophysical Research
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    Publication Date: 2020-02-12
    Keywords: 550 - Earth sciences
    Language: English
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  • 3
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    Rejuvenation of the lithosphere by the Hawaiian plume (2004)
    In:  Nature
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    Publication Date: 2020-02-12
    Description: The volcanism responsible for creating the chain of the Hawaiian islands and seamounts is believed to mark the passage of the oceanic lithosphere over a mantle plume1,2. In this picture hot material rises from great depth within a fixed narrow conduit to the surface, penetrating the moving lithosphere3. Although a number of models describe possible plume–lithosphere interactions4, seismic imaging techniques have not had sufficient resolution to distinguish between them. Here we apply the S-wave ‘receiver function’ technique to data of three permanent seismic broadband stations on the Hawaiian islands, to map the thickness of the underlying lithosphere. We find that under Big Island the lithosphere is 100–110 km thick, as expected for an oceanic plate 90–100 million years old that is not modified by a plume. But the lithosphere thins gradually along the island chain to about 50–60 km below Kauai. The width of the thinning is about 300 km. In this zone, well within the larger-scale topographic swell, we infer that the rejuvenation model5 (where the plume thins the lithosphere) is operative; however, the largerscale topographic swell is probably supported dynamically.
    Keywords: 550 - Earth sciences
    Language: English
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  • 4
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    Near Real Time GPS Water Vapor Monitoring for Numerical Weather Prediction in Germany (2004)
    In:  Journal of the Meteorological Society of Japan
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    Publication Date: 2020-02-12
    Keywords: 550 - Earth sciences
    Language: English
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  • 5
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    Slab-derived boron isotope signatures in arc volcanic rocks from the Central Andes and evidence for boron isotope fractionation during progressive slab dehydration (2003)
    In:  Geochemistry Geophysics Geosystems (G3)
    Details
    Publication Date: 2020-02-12
    Description: Late Miocene to Quaternary volcanic rocks from the frontal arc to the back-arc region of the Central Volcanic Zone in the Andes show a wide range of δ11B values (+4 to −7 ‰) and boron concentrations (6 to 60 ppm). Positive δ11B values of samples from the volcanic front indicate involvement of a 11B-enriched slab component, most likely derived from altered oceanic crust, despite the thick Andean continental lithosphere, and rule out a pure crust-mantle origin for these lavas. The δ11B values and boron concentrations in the lavas decrease with increasing depth of the Wadati-Benioff Zone. This across-arc variation in δ11B values and decreasing B/Nb ratios from the arc to the back-arc samples are attributed to the combined effects of boron-isotope fractionation during progressive dehydration in the slab and a steady decrease in slab-fluid flux toward the back arc, coupled with a relatively constant degree of crustal contamination as indicated by similar Sr, Nd and Pb isotope ratios in all samples. Three-component mixing calculations for slab-derived fluid, the mantle wedge and the continental crust based on B, Sr and Nd isotope data indicate that the slab-fluid component dominates the boron composition of the fertile mantle and that the primary arc magmas were contaminated by an average addition of 15 to 30% crustal material. Modeling of fluid-mineral boron-isotope fractionation as a function of temperature shows that dehydration reactions liberate continuously changing fluid compositions from the slab during progressive subduction. A combination of a boron-isotope fractionation model and a temperature model for the Central Andean subduction zone fits the across-arc variation in δ11B and we conclude that the boron-isotope composition of arc volcanic rocks, especially in island arcs, is dominated by changing δ11B-composition of boron-rich slab-fluids during progressive dehydration. Owing to the decrease in slab-derived fluid flux crustal contamination becomes more important toward the back-arc. Because of the boron-isotope fractionation effect, across-arc variations in δ11B need not necessarily reflect different mixing proportions between boron derived from the slab-fluid and the mantle wedge.
    Keywords: 550 - Earth sciences
    Language: English
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  • 6
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    Receiver function analysis of the crust and upper mantle from the North German Basin to the Archaean Baltic Shield. (2003)
    In:  Geophysical Journal International
    Details
    Publication Date: 2020-02-12
    Description: Two passive seismic experiments have been carried out across the Trans European Suture Zone (TESZ) from northern Germany to southern Sweden (TOR) and across the Proterozoic-Archaean suture in Finland (SVEKALAPKO) to improve our understanding of the processes involved in the creation of the European continent. Teleseismic earthquakes recorded by the studies of the crust-mantle, and upper mantle seismic discontinuities with the receiver function method. Along the TOR network the depth to the Moho increases from 30 km at the southern edge of the profile to 40 km at the Elbe Line. Between the Elbe Line and TESZ the Moho branches off and whereas the deeper branch continues at 40 km depth to the TESZ a second branch appears at 30.35 km depth. The upper branch descends north of the TESZ to below 55 km under the northern end of the TOR profile. The crustal thickening north of the TESZ is accompanied by an increase in average Vp/Vs values, appearance of intracrustal conversion zones and north dipping features which we interpret as remnants of the subduction and subsequent collision between Avalonia and Baltica. In southern Finland beneath the SVEKALAPKO network the Moho starts in the south at the depth of 40-45 km, plunges to about 65 km depth south of the Archaean-Proterozoic suture. This deepening of the Moho is coincident with a north dipping intracrustal structure apparently related to the subduction and collision and of the Proterozoic and Archaean provinces in Proterozoic. North of the line of the suture the Moho rises smoothly to 45-50 km depth in the Archaean province. Along the TOR profile, 410 and 660 discontinuities were hard to detect. However, manyfold stacking of receiver functions revealed that the conversions from the two discontinuities arrive more or less accordingto IASP91 predicted time. Across the SVEKALAPKO network 410 and 660 discontinuities arrive markedly earlier than IASP91 theoretical arrival times. In particular north of the Archaean-Proterozoic suture in Finland the 410 and 660 km conversions arrive about 2s earlier, indicating about 5 per cent higher average upper mantle velocities and lower temperatures than what IASP91 global model predicts. Test
    Keywords: 550 - Earth sciences
    Language: English
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  • 7
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    Depth to Moho in Greenland: receiver-function analysis suggests two Proterozoic blocks in Greenland (2003)
    In:  Earth and Planetary Science Letters
    Details
    Publication Date: 2020-02-12
    Description: The GLATIS project (Greenland Lithosphere Analysed Teleseismically on the Ice Sheet) with collaborators has operated a total of 16 temporary broadband seismographs for periods from 3 months to 2 years distributed over much of Greenland from late 1999 to the present. The very first results are presented in this paper, where receiver-function analysis has been used to map the depth to Moho in a large region where crustal thicknesses were previously completely unknown. The results suggest that the Proterozoic part of central Greenland consists of two distinct blocks with different depths to Moho. North of the Archean core in southern Greenland is a zone of very thick Proterozoic crust with an average depth to Moho close to 48 km. Further to the north the Proterozoic crust thins to 37–42 km. We suggest that the boundary between thick and thin crust forms the boundary between the geologically defined Nagssugtoqidian and Rinkian mobile belts, which thus can be viewed as two blocks, based on the large difference in depth to Moho (over 6 km). Depth to Moho on the Archean crust is around 40 km. Four of the stations are placed in the interior of Greenland on the ice sheet, where we find the data quality excellent, but receiver-function analyses are complicated by strong converted phases generated at the base of the ice sheet, which in some places is more than 3 km thick.
    Keywords: 550 - Earth sciences
    Language: English
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  • 8
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    Short- and long-term effects of GPS measured crustal deformation rates along the south central Andes (2003)
    In:  Journal of Geophysical Research
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    Publication Date: 2020-02-12
    Keywords: 550 - Earth sciences
    Language: English
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  • 9
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    Stratigraphische Tabelle von Deutschland (STD) 2002 (2002)
    In:  Schriftenreihe der Deutschen Geologischen Gesellschaft
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    Publication Date: 2020-02-12
    Keywords: 550 - Earth sciences
    Language: German
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  • 10
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    Goethe und die Wolken : In Zusammenarbeit mit dem Kunstamt Charlottenburg zu Berlin anläßlich der Ausstellung: "Wetterstation" von Nina Neumaier in der Kleinen Orangerie, Schloss Charlottenburg, 20.-22. August 1999 zum 250. Geburtstag von J.W. von Goethe (2002)
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    Publication Date: 2020-02-12
    Keywords: 550 - Earth sciences
    Language: German , English
    Type: info:eu-repo/semantics/other
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  • 11
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    First experience with near real-time water vapor estimation in a German GPS network (2001)
    In:  Journal of Atmospheric and Solar-Terrestrial Physics
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    Publication Date: 2020-02-12
    Keywords: 550 - Earth sciences
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  • 12
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    Assessment of the natural frequency of the sedimentary cover in the Cologne area (Germany) using noise measurements (2001)
    In:  Journal of Earthquake Engineering
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    Publication Date: 2020-02-12
    Description: Noise measurements were carried out at 381 sites in the Cologne area (Germany) using both short period and broad band sensors. The large number of data allowed both assesment of the influence of different sensors in the site response estimation and to compare the widely used H/V technique with the recently proposed Fourier Phase Spectral Method (FPSM). The results show that short period sensors are able to reliably retrieve site effects at frequencies well below their corner frequencies. Moreover, the H/V method should be preferred to the FPSM in determining the fundamental resonance frequency of soils. Finally, a map showing the resonance frequency distribution in the studied area was drawn using the results obtained applying the H/V technique.
    Keywords: 550 - Earth sciences
    Language: English
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  • 13
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    Berechnung eislastinduzierter Vertikalbewegungen und Geoidänderungen in Südostalaska mit Hilfe viskoelastischer Erdmodelle (2001)
    Deutsches GeoForschungsZentrum GFZ
    In:  Scientific Technical Report
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    Publication Date: 2020-02-12
    Description: In Südostalaska wird eine relative Meeresspiegelabsenkung von bis zu 4 cm/ a beobachtet. Da dieses Gebiet während der letzten Kaltperiode durch das Kordillerische Eisschild bedeckt war und noch heute von Vergletscherung geprägt ist, liegt die Vermutung nahe, daß die Meeresspiegeländerungen zumindest teilweise durch isostatische Ausgleichsvorgänge hervorgerufen werden. Um diese Hypothese zu prüfen, werden für dieses Gebiet eislastinduzierte Vertikalbewegungen und Geoidänderungen mit Hilfe viskoelastischer Erdmodelle berechnet. Insbesondere werden sechs siebenschichtige Erdmodelle verwendet, die unterschiedliche Viskostitätsprofile berücksichtigen und die Bandbreite der plausiblen Lithosphärenmächtigkeiten abdecken. Das globale Lastmodell ICE-3G wird erweitert und das regionale Lastmodell AL-1 entwickelt, welches die rezente Vergletscherung Südostalaskas berücksichtigt. Weiterhin werden die Ozeane als Last einbezogen. Ein Vergleich der berechneten mit den beobachteten Meeresspiegeländerungen zeigt, daß die Beobachtungen nur zu einen geringen Anteil von wenigen Millimetern pro Jahr durch Isostasie erklärt werden können.
    Keywords: 550 - Earth sciences
    Language: German
    Type: info:eu-repo/semantics/report
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  • 14
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    Upper mantle anisotropy at the transition zone of the Saxothuringicum and Moldanubicum in southeast Germany revealed by shear wave splitting (2001)
    In:  Geophysical Journal International
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    Publication Date: 2020-02-12
    Description: The main structures of the mid-European lithosphere, crossing Europe from the Iberian peninsula to the Bohemian Massif, are predominantly formed by the Variscan orogeny. To investigate the anisotropy of the mantle at the transition zone between the two Variscan units, the Saxothuringicum and the Moldanubicum, we carried out a field experiment in SE Germany in 1995-1996: 23 mobile broad-band stations were installed for 6 months in the Vogtland-Oberpfalz-Bavarian Forest area. The station profile crossed the suture zone of the Saxothuringicum and Moldanubicum near the KTB borehole (German Continental Deep Drilling Program). With a mean station spacing of about 10 km? we intended to obtain a high lateral resolution of the anisotropy parameters and to resolve possible changes when passing the suture zone. The analysis of the observed birefringence of SKS phases shows E-W directions for the fast polarization. Therefore, the directions deviate only slightly from the strike of the Hercynian mountain belt and from the direction of the absolute plate motion in that region. Indications for the transition zone come from a rotation of the fast polarization direction from 86 degrees +/- 13 degrees in the northern part of the profile (Saxothuringicum) to 110 degrees +/- 15 degrees in the southern part (Moldanubicum) as well as from strong variations of the splitting parameters with respect to the azimuths of the incoming waves in the middle of the profile. We interpret these variations as an expression of a complex mantle structure formed either by several anisotropic layers with inclined symmetry axes in at least one layer or by a model consisting of inhomogeneous anisotropic layers. A comparison of the azimuthal variations of the splitting parameters in the middle of the profile with those observed at the Grafenberg station GRAl-situated in the central part of the transition zone approximately 100 km to the west-shows remarkable differences, which may reflect lateral variations in the direction and inclination of the symmetry axes in the transition zone even on a small scale. Both observations-the change in the fast polarization direction from the northern to the southern part as well as the variations with respect to different azimuths in the middle of the profile-suggest that the transition zone between the Saxothuringicum and the Moldanubicum continues down into the upper mantle.
    Keywords: 550 - Earth sciences
    Language: English
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  • 15
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    Salinare Tiefenwässer in Norddeutschland : gas- und isotopengeochemische Untersuchungen zur Herkunft und geothermische Nutzung (2000)
    Deutsches GeoForschungsZentrum GFZ
    In:  Scientific Technical Report STR
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    Publication Date: 2021-02-25
    Description: Die im Norddeutschen Becken vorkommenden hochsalinaren, heißen Tiefenwässer besitzen ein beträchtliches Wärmepotential, das bisher in Neustadt-Glewe, Neubrandenburg und Waren zur Energiegewinnung genutzt wird. Das Ziel der vorliegenden Arbeit bestand zum einen darin, die Herkunft und die Genese dieser Solen und der in ihnen gelösten Stoffe zu rekonstruieren. Ein zweiter Schwerpunkt bestand in der Ermittlung geochemischer Parameter, die für einen problemlosen Langzeitbetrieb geothermischer Anlagen und somit für deren Wirtschaftlichkeit von Bedeutung sind. Die untersuchten Solen stammten aus Aquiferen, die durch fünf Bohrungen (Neubrandenburg, Waren, Rheinsberg, Neustadt-Glewe, Hamburg-Allermöhe) in Tiefen von 1250 bis 3250 m (54 bis l28°C) erschlossen wurden. Alle untersuchten Na-Cl-Solen wurden aus Sandsteinaquiferen des Keuper (Contorta!Postera-Schichten) gefördert, für die mit zunehmender Tiefe steigende TDS-Gehalte (134 bis 224 g/1) charakteristisch sind. Die Zusammensetzung der gelösten Feststoffe blieb über einen Zeitraum von 3 Jahren konstant. Die Br/CJ-Verhältnisse der Solen sind kleiner als in eingedampftem Meerwasser. Dies und 811B-Werte von +23.8 %o bis +36.3 %o indizieren die Herkunft des Salzgehaltes durch Auflösung/Laugung von Salzen. Das Gas-Wasser-Volumenverhältnis in Proben geothermisch genutzter Solen liegt bei max. 1:10. Die Gasphase wird von C02, N2 und CH4 dominiert, wobei der Gehalt an C02 und CH4 mit der Tiefe zunimmt. Als Spurengase treten He, Ar, H2 und weitere Kohlenwasserstoffe auf (jeweils 〈1 Vol.-%). Die Gasphase des Thermalwassers Neustadt-Giewe zeigte über einen Zeitraum von 2 Jahren keine Änderung in ihrer Zusammensetzung. Periodische Schwankungen in sehr kleinen Konzentrationsbereichen während einer mehrtägigen Gasmeßkampagne korrelieren mit den Erdgezeiten. Die N2-Ar-He-Verhältnisse zeigen, daß es sich um tiefzirkulierende Oberflächenwässer handelt. Untermauert wird diese Interpretation durch die sehr niedrigen 3HefHe-Verhältnisse (R!Ra:S;O.Ol), die keine Mantelheliumkomponente anzeigen, sowie die gegenüber Luft (295.5) leicht erhöhten 40 Ar/36 Ar-Verhältnisse von bis zu 367.5. He-Akkumulationsalter als scheinbare Verweildauer der Solen von 20 bis 50 Ma wurden berechnet. Das Tiefenwasser von NeustadtGiewe besaß gegenüber den anderen Lokationen erhöhte Kohlenwasserstoffgehalte. Die 813C1,2,3- Werte weisen auf thermogenetische Kohlenwasserstoffe und auf ein marines Ausgangsmaterial mit einer Reife, die einer Vitrinitreflektion von etwa 1.2 % entspricht, hin. Die Herkunft aus Corgreichen Zechstein-Sedimenten ist wahrscheinlich, organisches Material des wesentlich tiefer liegenden Karbons scheidet als Quelle aus. Die 8180- und öD-Werte der Wässer zeigen an, daß meteorisches Wasser bei der Genese eine bedeutende Rolle gespielt hat. Die ermittelte isatopische Zusammensetzung der meteorischen Komponente weicht von heutigen Niederschlagswässern ab und weist einen letztmaligen Kontakt mit der Atmosphäre zu einer Zeit deutlich wärmeren Klimas als das heutige nach. Die in einem Thermalwasser vorhandenen Gase können die technologische Eignung der Sole und den Betrieb einer geothermischen Anlage maßgeblich beinflussen (Scaling, Auftreten brennbarer Gase, Entlösung von Gasen). Bei Vorhandensein Corg-reicher Sedimente nimmt die Wahrscheinlichkeit des Auftretens brennbarer Gase in Wässern aus größerer Tiefe, die durch ihre höhere Temperatur wirtschaftlicher sind, zu. Um die Entgasung eines Tiefenwassers innerhalb einer Anlage zu verhindem und somit Scaling und unkontrolliertes Entgasen zu minimieren, wurde anhand Literaturdaten exemplarisch für den Thermalwasserkreislauf der Anlage Neustadt-Giewe (Sole mit den höchsten Gasgehalten) ein Mindestanlagendruck berechnet. Danach sind etwa 2 bar ausreichend, um ein Entgasen der Sole zu verhindern; Strömungseffekte erfordern jedoch eine Erhöhung des Anlagendrucks auf etwa 4 bar. Die zeitliche Konstanz in der Zusammensetzung der gelösten Feststoffe und der Gasphase über einen Zeitraum von 2 bzw. 3 Jahren zeugt von einer relativ großen räumlichen Homogenität der Aquifere, wodurch der Betrieb der Anlagen durch Änderungen in der chemischen Zusammensetzung der Solen kaum gefährdet zu sein scheint. Die Ergebnisse der vorliegenden Arbeit haben gezeigt, daß sowohl bei der hydrodynamischen Vorerkundung als auch während des Betriebes eines geothermischen Heizwerkes die genaue Kenntnis der Gasmengen und der Gaszusammensetzung von entscheidender Bedeutung ist.
    Description: Deep seated hydrothermal brines in the North German Basin have a considerable heat potential, which is currently used for geothermal energy recovery in Neustadt-Glewe, Neubrandenburg and Waren. One aim of this study was to reconstruct the origin of these brines and their dissolved substances. Another goalwas to determine geochemical parameters which are critically influence the long-term operation, and hence the econornic viability of geothermal plants. The brines come from aquifers which have been accessed by 5 boreholes (Neubrandenburg, Waren, Rheinsberg, Neustadt-Glewe, Hamburg-Allermöhe) in depths from 1250 to 3250 m (54 to 128 °C). All investigated Na-Cl-brines were produced from sandstone aquifers of the Keuper (Contorta!Postera layers). Typically, TDS-values (134 to 224 g/1) increase with depth. The compositions of the dissolved solids were constant during 3 years. The Br/Cl ratios of the brines are lower than evaporated sea water. This, and 811B-values of +23.8 %o up to +36.3 %o indicate dissolution/leaching of salt as the origin of the salt content. The gas-water volume ratio of samples from brines used for geothermal energy recovery are less than around 1:10. The gas phase is dorninated by C02, N2 and C~ with higher C02- and C~ contents with increasing depths. He, Ar, H2 and other hydrocarbons exist as traces ( 〈1 vol.% each). The gas phase of the thermal water from Neustadt-Giewe showed no changes in its composition during 2 years. Small · periodical variations in the concentrations obtained from gas monitaring over several days correlate with the earth tides. The N2-Ar-He ratios show that the waters are deep-circulating meteoric waters. This interpretation is supported by very low 3HefHe ratios (R!Ra:S;O.Ol), which show no mantle helium, and 40 ArP6 Ar ratios up to 367.5, which are slightly enhanced compared to air (295.5). He accumulation ages, taken as the apparent residence time of the brines, were calculated to be 20 to 50 Ma. Compared to the other locations the formation water from Neustadt-Giewe contained enhanced hydrocarbon contents. The 813C1,2,3 values point to thermogenic hydrocarbons and to a marine source rock with a maturity corresponding to about 1.2 % vitrinite reflectivity. An origin from Corg-rich Zechstein sediments seems probable, organic material from significantly deeper-seated Carboniferous formations can be ruled out. The 8180 and ÖD values of the waters confirm that meteoric water played an important role in the brine genesis. The determined isotopic composition of the meteoric component deviates from recent precipitation and indicates a last contact with the atmosphere at a time when climate conditions were significantly warmer than today. Gases dissolved in thermal waters can significantly affect both the technological suitability of a brine and the operation of a geothermal heat plant (scaling, degassing, occurence of flammable gases). If Corg-rich sedimentary rocks occur, the probability of the occurence of flammable gases increases in waters from larger depths, which are more economic due to their higher temperature. The pressure needed to prevent degassing inside a plant and thus to rninirnize scaling and uncontrolled degassing was calculated for the example of the thermal water cycle at Neustadt-Giewe (brine with the highest gas content). About 2 bars are sufficient to prevent degassing; however, flow effects require increasing the pressure up to about 4 bars. The constant composition of both the dissolved solids and gases over a period of 2 to 3 years is a sign of a relatively large spatial uniformity of the aquifers. Therefore the continuous operation of the plants seems unlikely to be endangered by a change in the chernical composition of the brines. The results of this study have shown that during the hydrodynarnic reconnaissance as weil as during the operation of a geothermal heat plant, precise knowlegde of the gas concentration is of essential importance.
    Keywords: 550 - Earth sciences
    Language: German
    Type: info:eu-repo/semantics/doctoralThesis
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  • 16
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    A receiver function study of the northwest pacific subduction zone and the hawaiian mantle plume (2000)
    GeoForschungsZentrum
    In:  Scientific Technical Report
    Details
    Publication Date: 2020-02-12
    Description: Seismological models of upper mantle structure provide important constraints on the Earth"s convection system. Resolving the details of the upper mantle discontinuities is important for modelling the composition of the mantle and for understanding the effect that the discontinuities may have on mantle convection. Recently, numerous permanent and temporary seismic stations and networks have been set up around the world. It is possible to get the seismic records for the research needs from data management systems like IRIS, GEOFON, GEOSCOPE, FREESIA, etc. The use of seismograms collected from a large number of stations and earthquakes around the world enable us to study the global and the regional structure of the Earth. In this work, the receiver function technique (e.g. Owens et. Al., 1995) is applied to study the upper mantle structure in the northwest Pacific subduction zone and in the Hawaiian hotspot area. In the northwest Pacific, the Pacific plate is subducted into the upper mantle to more than 600 km depth, indicated by seismicity. In Hawaii, the volcanic edifice of the Hawaiian Islands and seamounts are believed to result from the passage of the oceanic lithosphere over a stationary mantle hotspot (Wilson, 1963; Morgan, 1971; Morgan et. al., 1995). In both regions the upper mantle structure is affected by the cold and warm materials, respectively. To study the extension of the temperature anomaly is important for understanding the Earth"s convection system. The olivine component of the mantle material is intensively studied in laboratories (e.g. Ito and Takahashi, 1989; Irifune, 1987). With increasing temperature and pressure, the olivine crystal undergoes a series of phase transformations which will result in a variation of the seismic structure. The effect of the temperature anomaly on the main upper mantle discontinuities will be discussed in chapter 2. Recently, the receiver function technique is increasingly applied to investigate the upper mantle discontinuities. To isolate the upper mantle conversion phases, newly developed moveout correction and migration methods are applied to separately distributed seismic stations as well as station arrays. The receiver function method used in this study will be introduced in chapter 3. In chapter 4 and 5, receiver function studies in the area of the northwest Pacific subduction zone and the Hawaiian mantle plume are presented. Regional tectonic background and the previous seismological works in these two areas will be first introduced in each chapter, and followed by description of data, processing steps, results and interpretations. In chapter 6, I will summarize the observations of the 410 and 660 topography in the northwest Pacific subduction zone and in the area around the Hawaiian mantle plume.
    Keywords: 550 - Earth sciences
    Language: English
    Type: info:eu-repo/semantics/doctoralThesis
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    Hochauflösende Schwerefeldbestimmung aus Kombination von terrestrischen Messungen und Satellitendaten über Kugelfunktionen (2000)
    GeoForschungsZentrum
    In:  Scientific Technical Report
    Details
    Publication Date: 2020-02-12
    Keywords: 550 - Earth sciences
    Language: German
    Type: info:eu-repo/semantics/doctoralThesis
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  • 18
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    Magnetotellurik und erdmagnetische Tiefensondierung bei Rittsteig, Bayern (2000)
    In:  Protokoll über das Kolloquium Elektromagnetische Tiefenforschung: 18. Kolloquium: Altenberg, 20.3. - 24.3.2000
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    Publication Date: 2021-09-15
    Description: Im Herbst 1998 sind in einer Zusammenarbeit zwischen dem GFZ Potsdam und der Universität Frankfurt a. Main nahe der Ortschaft Rittste ig (Böhmerwald, Bayern) magnetotellurische Messungen und erdmagnetische Tiefensondierungen mit SPAM Mk III-Datenloggern im Frequenzbereich zwischen maximal lk H z und 0.001H z durchgeführt worden. Im Folgenden werden die Ergebnisse von zwölf Stationen vorgestellt . Mit 2D Modellrechnungen soll überprüft werden, inwieweit existierende Eigenpo~entialmodelle durch die Magnetotellurik bestätig t und erweitert werden können.
    Keywords: 550 - Earth sciences
    Language: German
    Type: info:eu-repo/semantics/conferenceObject
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    Evaluation of pre-CHAMP Gravity Models "GRIM5-S1" and "GRIM5-C1" with Satellite Crossover Altimetry (2000)
    GFZ German Research Centre for Geosciences
    In:  Scientific Technical Report STR
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    Publication Date: 2020-02-12
    Description: The new GFZ/GRGS gravity field models GRIM5-S1 and Cl, current initial models for the CHAMP mission, have been compared with other recent models (JGM 3, EGM 96) for radial accuracy (by means of latitude lumped coefficients) in computations on altimetry satellite orbits. The basis for accuracy judgements are extensive (multi-year) averages of crossover sea height differences from Geosat and ERS 1/2 missions. These data are fully independent of the data used to develop these gravity models. We tested how well these observed differences in all the world's oceans agree with projections of the same errors from the scaled covariance matrix of their harmonic geopotential coefficients. It was found that the tentative (model) scale factor of 5 for the formal standard deviations of the harmonic coefficients of the new GRIM fields is justified, i.e. the accuracy estimates, provided together with the geopotential coefficients, are realistic.
    Keywords: 550 - Earth sciences
    Language: English
    Type: info:eu-repo/semantics/report
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    Seismic polarization anisotropy beneath the central Tibetan Plateau (2000)
    In:  Journal of Geophysical Research
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    Publication Date: 2020-02-12
    Description: SKS and SKKS shear waves recorded on the INDEPTH III seismic array deployed in central Tibet during 1998 - 1999 have been analysed for the direction and extent of seismic polarization anisotropy. The 400-km-long NNW trending array extended south to north, from the central Lhasa terrane, across the Karakoram-Jiali fault system and Banggong-Nujiang suture to the central Qiangtang terrane. Substantial splitting with delay times from 1 to 2 s, and fast directions varying from E-W to NE-SW, was observed for stations in the Qiangtang trerrane and northernmost Lhasa terrane. No detectable splitting was observed for stations located farther south in the central Lahsa terrane. The change in shear wave splitting characteristics occurs at 32°N, approximately coincident with the transcurrent Karakoram-Jiali fault system but ~40 km south of the surface trace of the Banggong-Nujiang suture. This location is also near the southernmost edge of a region of high Sn attenuation and low upper mantle velocities found in previous studies. The transition between no measured splitting and strong anisotropy (2.2 s delay time) is exceptionally sharp (=15 km), suggesting a large crustal contribution to the measured splitting. The E-W to NE-SW fast directions are broadly similar to the fast directions observed farther east along the Yadong-Golmud highway, suggesting that no large-scale change in anisotropic properties occurs in the east-west direction. However, in detail, fast directions and delay times vary over lateral distances of ~100 km in both the N-S and E-W direction by as much as 40° and 0.5-1 s, respectively. The onset of measurable splitting at 32° N most likely marks the northern limit of the underthrusting Indian lithosphere, which is characterized by negligible polarization anisotropy. Taken in conjunction with decades of geophysical and geological observations in Tibet, the new anisotropy measurements are consistent with a model where hot and weak upper mantle beneath northern Tibet is being squeezed and sheared between the advancing Indian lithosphere to the south and the Tsaidam and Tarim Lithospheres to the north and west, resulting in eastward flow and possibly thickening and subsequent detachment due to gravitational instability. In northern Tibet, crustal deformation clearly follows this large-scale deformation pattern.
    Keywords: 550 - Earth sciences
    Language: English
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  • 21
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    The Archaeology of Geological Catastrophes (2000)
    London : The Geological Society
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    Keywords: Geoarchäologie ; Naturkatastrophe ; Archaeological geology ; Archaeology ; Archaeology and natural disasters ; Archäologie ; Archéologie et catastrophes naturelles ; Catastrophes (Geology) ; Catastrophes naturelles ; Earthquakes ; Effect of environment on ; Geschichte ; History ; Human beings ; Methodology ; Tremblements de terre ; Volcanoes ; Volcans
    Description / Table of Contents: Preface / Iain Stewart / Geological Society, London, Special Publications, 171, vii-ix, 1 January 2000, https://doi.org/10.1144/GSL.SP.2000.171.01.01 --- Creation and destruction of travertine monumental stone by earthquake faulting at Hierapolis, Turkey / P. L. Hancock, R. M. L. Chalmers, E. Altunel, Z. Çakir and A. Becher-Hancock / Geological Society, London, Special Publications, 171, 1-14, 1 January 2000, https://doi.org/10.1144/GSL.SP.2000.171.01.02 --- Uses of volcanic products in antiquity / D. R. Griffiths / Geological Society, London, Special Publications, 171, 15-23, 1 January 2000, https://doi.org/10.1144/GSL.SP.2000.171.01.03 --- The advent of archaeoseismology in the Mediterranean / R. E. Jones and S. C. Stiros / Geological Society, London, Special Publications, 171, 25-32, 1 January 2000, https://doi.org/10.1144/GSL.SP.2000.171.01.04 --- A critical reappraisal of the classical texts and archaeological evidence for earthquakes in the Atalanti region, central mainland Greece / Victoria Buck and Iain Stewart / Geological Society, London, Special Publications, 171, 33-44, 1 January 2000, https://doi.org/10.1144/GSL.SP.2000.171.01.05 --- Aims and methods in territorial archaeology: possible clues to a strong fourth-century AD earthquake in the Straits of Messina (southern Italy) / Emanuela Guidoboni, Anna Muggia and Gianluca Valensise / Geological Society, London, Special Publications, 171, 45-70, 1 January 2000, https://doi.org/10.1144/GSL.SP.2000.171.01.06 --- Santorini (Greece) before the Minoan eruption: a reconstruction of the ring-island, natural resources and clay deposits from the Akrotiri excavation / Walter L. Friedrich, Marit-Solveig Seidenkrantz and Ole Bjørslev Nielsen / Geological Society, London, Special Publications, 171, 71-80, 1 January 2000, https://doi.org/10.1144/GSL.SP.2000.171.01.07 --- The eruption of the Santorini volcano and its effects on Minoan Crete / Jan Driessen and Colin F. MacDonald / Geological Society, London, Special Publications, 171, 81-93, 1 January 2000, https://doi.org/10.1144/GSL.SP.2000.171.01.08 --- Late Minoan IB marine ware, the marine environment of the Aegean, and the Bronze Age eruption of the Thera volcano / Peter Bicknell / Geological Society, London, Special Publications, 171, 95-103, 1 January 2000, https://doi.org/10.1144/GSL.SP.2000.171.01.09 --- Ground-penetrating radar mapping of Minoan volcanic deposits and the Late Bronze Age palaeotopography, Thera, Greece / James K. Russell and Mark V. Stasiuk / Geological Society, London, Special Publications, 171, 105-121, 1 January 2000, https://doi.org/10.1144/GSL.SP.2000.171.01.10 --- Precursory phenomena and destructive events related to the Late Bronze Age Minoan (Thera, Greece) and AD 79 (Vesuvius, Italy) Plinian eruptions; inferences from the stratigraphy in the archaeological areas / Raffaello Cioni, Lucia Gurioli, Alessandro Sbrana and Georges Vougioukalakis / Geological Society, London, Special Publications, 171, 123-141, 1 January 2000, https://doi.org/10.1144/GSL.SP.2000.171.01.11 --- A geographical information system for the archaeological area of Pompeii / M. T. Pareschi, G. Stefani, A. Varone, L. Cavarra, F. Giannini and A. Meriggi / Geological Society, London, Special Publications, 171, 143-158, 1 January 2000, https://doi.org/10.1144/GSL.SP.2000.171.01.12 --- Apulian Bronze Age pottery as a long-distance indicator of the Avellino Pumice eruption (Vesuvius, Italy) / Raffaello Cioni, Sara Levi and Roberto Sulpizio / Geological Society, London, Special Publications, 171, 159-177, 1 January 2000, https://doi.org/10.1144/GSL.SP.2000.171.01.13 --- Human response to Etna volcano during the classical period / D. K. Chester, A. M. Duncan, J. E. Guest, P. A. Johnston and J. J. L. Smolenaars / Geological Society, London, Special Publications, 171, 179-188, 1 January 2000, https://doi.org/10.1144/GSL.SP.2000.171.01.14 --- The Johnston-Lavis collection: a unique record of Italian volcanism / W. L. Kirk, R. Siddall and S. Stead / Geological Society, London, Special Publications, 171, 189-194, 1 January 2000, https://doi.org/10.1144/GSL.SP.2000.171.01.15 --- The archaeology of a Plinian eruption of the Popocatépetl volcano / Patricia Plunket and Gabriela Uruñuela / Geological Society, London, Special Publications, 171, 195-203, 1 January 2000, https://doi.org/10.1144/GSL.SP.2000.171.01.16 --- Timing of the prehistoric eruption of Xitle Volcano and the abandonment of Cuicuilco Pyramid, Southern Basin of Mexico / Silvia Gonzalez, Alejandro Pastrana, Claus Siebe and Geoff Duller / Geological Society, London, Special Publications, 171, 205-224, 1 January 2000, https://doi.org/10.1144/GSL.SP.2000.171.01.17 --- Volcanic disasters and cultural discontinuities in Holocene time, in West New Britain, Papua New Guinea / Robin Torrence, Christina Pavlides, Peter Jackson and John Webb / Geological Society, London, Special Publications, 171, 225-244, 1 January 2000, https://doi.org/10.1144/GSL.SP.2000.171.01.18 --- Tephrochronology of the Brooks River Archaeological District, Katmai National Park and Preserve, Alaska: what can and cannot be done with tephra deposits / James R. Riehle, Don. E. Dumond, Charles E. Meyer and Jeanne M. Schaaf / Geological Society, London, Special Publications, 171, 245-266, 1 January 2000, https://doi.org/10.1144/GSL.SP.2000.171.01.19 --- Endemic stress, farming communities and the influence of Icelandic volcanic eruptions in the Scottish Highlands / R. A. Dodgshon, D. D. Gilbertson and J. P. Grattan / Geological Society, London, Special Publications, 171, 267-280, 1 January 2000, https://doi.org/10.1144/GSL.SP.2000.171.01.20 --- Comparison and cross-checking of historical, archaeological and geological evidence for the location and type of historical and sub-historical eruptions of multiple-vent oceanic island volcanoes / S. J. Day, J. C. Carracedo, H. Guillou, F. J. Pais Pais, E. Rodriguez Badiola, J. F. B. D. Fonseca and S. I. N. Heleno / Geological Society, London, Special Publications, 171, 281-306, 1 January 2000, https://doi.org/10.1144/GSL.SP.2000.171.01.21 --- ‘A fire spitting volcano in our dear Germany’: documentary evidence for a low-intensity volcanic eruption of the Gleichberg in 1783? / J. P. Grattan, D. D. Gilbertson and A. Dill / Geological Society, London, Special Publications, 171, 307-315, 1 January 2000, https://doi.org/10.1144/GSL.SP.2000.171.01.22 --- Volcanic soils: their nature and significance for archaeology / Peter James, David Chester and Angus Duncan / Geological Society, London, Special Publications, 171, 317-338, 1 January 2000, https://doi.org/10.1144/GSL.SP.2000.171.01.23 --- The use of volcaniclastic material in Roman hydraulic concretes: a brief review / Ruth Siddall / Geological Society, London, Special Publications, 171, 339-344, 1 January 2000, https://doi.org/10.1144/GSL.SP.2000.171.01.24 --- Olmec stone sculpture: selection criteria for basalt / Patrick Hunt / Geological Society, London, Special Publications, 171, 345-353, 1 January 2000, https://doi.org/10.1144/GSL.SP.2000.171.01.25 --- Seismic and volcanic hazards affecting the vulnerability of the Sana’a area of Yemen / Richard Hughes and Adrian Collings / Geological Society, London, Special Publications, 171, 355-372, 1 January 2000, https://doi.org/10.1144/GSL.SP.2000.171.01.26 --- Archaeological, geomorphological and geological evidence for a major earthquake at Sagalassos (SW Turkey) around the middle of the seventh century AD / Marc Waelkens, Manuel Sintubin, Philippe Muchez and Etienne Paulissen / Geological Society, London, Special Publications, 171, 373-383, 1 January 2000, https://doi.org/10.1144/GSL.SP.2000.171.01.27 --- Fault pattern of Nisyros Island volcano (Aegean Sea, Greece): structural, coastal and archaeological evidence / Stathis C. Stiros / Geological Society, London, Special Publications, 171, 385-397, 1 January 2000, https://doi.org/10.1144/GSL.SP.2000.171.01.28 --- The geological origins of the oracle at Delphi, Greece / J. Z. De Boer and J. R. Hale / Geological Society, London, Special Publications, 171, 399-412, 1 January 2000, https://doi.org/10.1144/GSL.SP.2000.171.01.29
    Pages: Online-Ressource (IX, 412 Seiten) , Illustrationen, Diagramme, Karten
    ISBN: 1862390622
    URL: http://sp.lyellcollection.org/content/171/1
    Language: English
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