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  • 1
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    In:  Geophysical Research Letters 26: 783-786
    Publication Date: 1999
    Keywords: Andes, ANCORP 96, seismology, tectonics/crustal structure, geological interpretation
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  • 2
    Publication Date: 2016-04-04
    Description: We installed a dense, amphibious, temporary seismological network to study the seismicity and structure of the seismogenic zone in southern Chile between 37° and 39°S, the nucleation area of the great 1960 Chile earthquake. 213 local earthquakes with 14.754 onset times were used for a simultaneous inversion for the 1-D velocity model and precise earthquake locations. Relocated artificial shots suggest an accuracy of the earthquake hypocenter of about 1 km (horizontally) and 500 m (vertically). Crustal events along trench-parallel and transverse, deep-reaching faults reflect the interseismic transpressional deformation of the forearc crust due to the subduction of the Nazca plate. The transverse faults seems to accomplish differential lateral stresses between subduction zone segments. Many events situated in an internally structured, planar seismicity patch at 20 to 40 km depth near the coast indicate a stress concentration at the plate's interface at 38°S which might in part be induced by the fragmented forearc structure.
    Type: Article , PeerReviewed
    Format: text
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  • 3
    Publication Date: 2018-02-15
    Description: In 2005 an amphibious seismic network was deployed on the Chilean forearc between 41.75°S and 43.25°S. 364 local events were observed in a 11-month period. A subset of the P and S arrival times were inverted for hypocentral coordinates, 1-D velocity structure and station delays. Main seismic activity occurred predominantly in a belt parallel to the coast of Chiloé Island in a depth range of 12–30 km presumably related to the plate interface. The 30° inclination of the shallow part of the Wadati-Benioff zone is similar to observations further north indicating that oceanic plate age is not controlling the subduction angle of the shallower part for the Chilean subduction zone. The down-dip termination of abundant intermediate depth seismicity at approximately 70 km depth seems to be related to the young age (and high temperature) of the oceanic plate. Crustal seismicity is associated with the Liquiñe-Ofqui fault zone and active volcanoes.
    Type: Article , PeerReviewed
    Format: text
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  • 4
    ISSN: 1432-1181
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Description / Table of Contents: Zusammenfassung Es wird ein einfaches Berechnungsverfahren vorgestellt, das eine Bestimmung des turbulenten Wärmeübergangs hinter einem hydrodynamischen Vorlauf gestattet. Durch eine Anpassung der Randbedingungen in der Reynoldsnalogie an die Strömungsverhältnisse bei unterschiedlichem Beginn von Temperatur- und Geschwindigkeitsgrenzschicht wird das Verhältnis der Nusseltzahlen einer Strömung mit Vorlauf zu der ohne Vorlauf formuliert. Dieses Nusseltzahlverhältnis stellt eine Korrekturfunktion für den Einfluß unbeheizter Anlaufstrecken dar und gestattet die Wärmeübergangsberechnung hinter hydrodynamischen Vorläufen aus den bekannten Gleichungen für den gleichzeitigen Beginn von Temperatur- und Strömungsgrenzschicht. Das Verfahren ist für Rohr-und Plattenströmungen anwendbar; die Korrekturfunktion ist in beiden Fällen eine Funktion der Vorlauflänge und der thermischen Lauflänge, für die Rohrströmung zusätzlich noch Funktion der Reynoldszahl.
    Notes: Abstract An analytical method is presented to calculate the turbulent heat transfer behind an hydrodynamic starting length. By modification of the boundary conditions in the Reynolds analogie with respect to the flow conditions for different running lengths of the boundary layer of temperatur and velocity the heat transfer ratio of a flow with to a flow without hydrodynamic starting length can be formulated. This heat transfer ratio is a correction function to describe the influence of an unheated starting length and allows the heat transfer calculation by using the well known heat transfer formulas for the simultaneous hydrodynamic and thermal start. The method can be applied as well to the flat plate flow as to the pipe flow. In both cases the correction function depends on the unheated starting length and the thermal running length, for the pipe flow additionaly on the Reynolds number.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1432-1181
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Description / Table of Contents: Zusammenfassung Es wird ein halbanalytisches Berechnungsverfahren zur Bestimmung der instationären Temperaturen von Haut-Steg-Verbindungen vorgestellt, das den Einfluß einer Fügung zwischen Haut (Flansch eines Winkels) und Steg numerisch berücksichtigt. Ausgehend von den Temperaturfunktionen, die sich unabhängig voneinander für die beiden Strukturelemente bei gegebenen Randbedingungen und konstanter Randtemperatur an der Verbindungsstelle ergeben, kann der thermische Übergangswiderstand der Fügung (z.B. einer Nietverbindung) durch Formulierung einer Wärmebilanz sowohl oberhalb als auch unterhalb der Fügung auf einfache Art in die Berechnung einbezogen werden. Das Verfahren, das am Beispiel von Flugzeugstrukturen (versteifte Tragflügelgurtplatte, Tragflügelkasten) für den Sprung der Fluidtemperatur und des Wärmeübergangskoeffizienten untersucht wird, läßt sich auch auf ähnliche Probleme in anderen Ingenieursdisziplinen übertragen.
    Notes: Abstract A semi-analytical method is presented for calculating temperature transients in skin-web-configurations including the effect of a thermal joint resistance at the web-skin (flange) junction. Based on the temperature functions independently developed for both elements at given boundary conditions and constant junction temperature the joint resistance can be taken into account easily by formulation of a heat balance above and below the joint. The method, here applied to aircraft structures (stiffened panel, wing box) for the step functions of fluid temperature and heat transfer coefficient can also be extended to similar problems in other engineering fields of application.
    Type of Medium: Electronic Resource
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  • 6
    Publication Date: 2016-06-22
    Description: A temporal seismic network recorded local seismicity along a 130 km long segment of the transpressional dextral strike-slip Liquiñe-Ofqui fault zone (LOFZ) in southern Chile. Seventy five shallow crustal events with magnitudes up to M(tief)w 3.8 and depths shallower than 25 km were observed in an 11-month period mainly occurring in different clusters. Those clusters are spatially related to the LOFZ, to the volcanoes Chaitén, Michinmahuida and Corcovado, and to active faulting on secondary faults. Further activity along the LOFZ is indicated by individual events located in direct vicinity of the surface expression of the LOFZ. Focal mechanisms were calculated using deviatoric moment tensor inversion of body wave amplitude spectra which mostly yield strike-slip mechanisms indicating a NE–SW direction of the P-axis for the LOFZ at this latitude. The seismic activity reveals the present-day activity of the fault zone. The recent M(tief)w 6.2 event near Puerto Aysén, Southern Chile at 45.4°S on April 21, 2007 shows that the LOFZ is also capable of producing large magnitude earthquakes and therefore imposing significant seismic hazard to this region.
    Type: Article , PeerReviewed
    Format: text
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  • 7
    Publication Date: 2017-11-09
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , NonPeerReviewed
    Format: application/pdf
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  • 8
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    GFZ Data Services
    Publication Date: 2018-03-05
    Description: Abstract
    Description: Local seismic network in Northern Chile, Southern Bolivia. (Grant-number: GIPP199604) Waveform data is available from the GEOFON data centre. License: “Creative Commons Attribution-ShareAlike 4.0 International License” (CC BY-SA).
    Keywords: Broadband seismic waveforms ; Seismic monitoring ; Central Andes ; magmatic arc ; local seismicity ; temporary local seismic network ; Northern Chile ; Southern Bolivia ; Monitoring system ; Seismological stations
    Type: Other , Seismic Network
    Format: ~70G
    Format: SEED data
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  • 9
    Publication Date: 2018-04-04
    Description: Abstract
    Description: The SWATH-D experiment is dense deployment of 154 seismic stations in the Central and Eastern Alps between Italy and Austria, complementing the larger-scale sparser AlpArray Seismic Network (AASN). SWATH-D will provide high resolution images from the surface into the upper mantle, and allow observations of local seismicity. SWATH-D focuses on a key area of the Alps where the hypothesized flip in subduction polarity has been suggested, and where an earlier seismic profile (TRANSALP) has imaged a jump in the Moho. Where mains power is available (at ca. 80 sites) stations are providing realtime data via the cellphone network and are equipped with Güralp CMG-3EPSC (60s) seismometers and Earth Data Recorders EDR-210. The rest of the stations are offline and consist mainly of Nanometrics Trillium Compact (120s) and Güralp CMG-3EPSC (60s) seismometers equipped with either Omnirecs CUBE3 or PR6-24 Earth Data Loggers. All stations are equipped with external GPS antennas and the sampling rate is 100 Hz (Heit, et al., 2018). The network will operate for 2 years starting in July 2017. The Swath-D data will be used directly by 20 individual proposals of the MB-4D Priority Program (Mountain Building Processes in Four Dimensions, 2017) of the German Research Foundation (DFG) and data products derived from it will contribute to additional 13 proposals. SWATH-D is thus an important link between the MB-4D Priority Program and the international AlpArray communities and a scientific service to many of the proposals within the DFG Priority Program. Waveform data are available from the GEOFON data centre, under network code ZS, and are embargoed until August 2023. After the end of embargo, data will be openly available under CC-BY 4.0 license according to GIPP-rules.
    Keywords: Broadband seismic waveforms ; Seismic monitoring ; temporary local seismic network ; Monitoring system ; Seismological stations
    Type: Other , Seismic Network
    Format: ~1T
    Format: SEED data
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  • 10
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    GFZ Data Services
    Publication Date: 2018-01-12
    Description: Abstract
    Description: The lithosphere of Iberia has been formed through a number of processes of continental collision and extension. In Lower Paleozoic, the collision of three tectonics blocks produced the Variscan Orogeny, the main event of formation of the Iberian lithosphere. The subsequent Mesozoic rifting and breakup of the Pangea had a profound effect on the continental crust of the western border of Iberia. Since the Miocene, the southern interaction between Africa and Iberia is characterized by a diffuse convergent margin that originates a vast area of deformation. The impact of this complex tectonic in the structure of the Iberian Lithosphere remains an incognito, especially in its western part beneath Portugal. While the surface geology is considerably studied and documented, the crustal and lithospheric structures are not well constrained. The existing knowledge relating the observed surface geology and Lithospheric deep structures is sparse and sometimes incoherent. The seismic activity observed along West Iberia is intensely clustered on few areas, namely on north Alentejo, Estremadura and Regua-Verin fault systems. Some of the problems to address are: What is the relation between surface topography and the deep crustal/lithospheric structure? How was it influenced by the past tectonic events? Which was the deep driving factor behind the tectonic units observed at surface: Lithosphere-Astenosphere boundary structure or deeper mantle structure? How the upper mantle and the Lithosphere-Astenosphere transition zone accommodated the past subduction? Which is its role and influence of the several tectonic units, and their contacts, in the present tectonic regime and in the stress field observed today? Is the anomalous seismicity and associated crustal deformation rates, due to an inherited structure from past orogenies? The main goal of this work is a 3D detailed image of the “slice” of the Earth beneath Western Iberia, by complementing the permanent seismic networks operating in Portugal and Spain. The different scales involved require the usage of several passive seismological methods: Local-Earthquake Tomography for fine structure of seismogenic areas, ambient noise tomography for regional crustal structure, Receiver Functions for Lithospheric structure and Surface-wave tomography for large scale Listosphere-Astenosphere structure. Crustal and Mantle seismic anisotropy analysis, coupled with source analysis and correlation with current geodetic measurements will allow establishing a reference 3D anisotropy model of present and past processes.
    Keywords: Broadband seismic waveforms ; Seismic monitoring ; Western Iberia ; seismotectonics ; temporary local seismic network ; Monitoring system ; Seismological stations
    Type: Other , Seismic Network
    Format: ~300G
    Format: SEED data
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