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  • Weitere Quellen  (17)
  • Elsevier  (12)
  • Inst. f. Geophys., Ruhr-Univ. Bochum  (5)
  • 2010-2014
  • 1980-1984  (17)
  • 1981  (9)
  • 1980  (8)
  • 1
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    Unbekannt
    High resolution group velocity analysis (1981)
    Elsevier
    In:  Bull., Polar Proj. OP-O3A4, Computer-aided Seismic Analysis and Discrimination, London, Elsevier, vol. 16, no. 4, pp. 97-109, (ISBN 0080419208)
    Details
    Publikationsdatum: 1981
    Schlagwort(e): Group veloc. ; Velocity analysis
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    BIBLIOGRAFIE SEISMOLOGIE
  • 2
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    Registrierungen seismischer Ereignisse im Ruhrgebiet 1980 (1981)
    Inst. f. Geophys., Ruhr-Univ. Bochum
    In:  Wissenschaftl. Veröffentl. (Reihe B), Hrsg. H.-P. Harjes, Atlanta, Inst. f. Geophys., Ruhr-Univ. Bochum, vol. 10, no. PL-TR-91-2127, pp. 1219-1222
    Details
    Publikationsdatum: 1981
    Schlagwort(e): BUG ; ERDSTOSS (see also rockburst and Gebirgsschlag) ; Mining geophysics ; GEBIRGSSCHLAG (see also rockburst and Erdstoss) ; Earthquake catalog ; Rock bursts (see also ERDSTOSS and GEBIRGSSCHLAG) ; Local earthquakes
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    BIBLIOGRAFIE SEISMOLOGIE
  • 3
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    Die Magnetisierung der ozeanischen Kruste Ein Beitrag zum Vine-Matthews-Modell nach Ergebnissen mariner Tiefbohrungen (1981)
    Inst. f. Geophys., Ruhr-Univ. Bochum
    In:  Dissertation, Berichte, Bochum, Inst. f. Geophys., Ruhr-Univ. Bochum, vol. 10, no. 9, pp. 1109-1111
    Details
    Publikationsdatum: 1981
    Schlagwort(e): Geomagnetics ; Plate tectonics ; Borehole geophys.
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    BIBLIOGRAFIE SEISMOLOGIE
  • 4
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    Geophysical Aspects of the Energy Problem (1980)
    Elsevier
    In:  Amsterdam, I-VII + 329 pp., Elsevier, vol. 1, no. Publ. No. 12, pp. 127, (ISBN 3-540-44363-0)
    Details
    Publikationsdatum: 1980
    Schlagwort(e): Geothermics ; application ; and ; prospection ; Earthquake hazard ; nuclear ; power ; plants ; Earthquake risk ; solar ; Energy (of earthquakes) ; pollution ; FROTH ; pp. ; 1-81, ; 279-288
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    BIBLIOGRAFIE SEISMOLOGIE
  • 5
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    Wave Propagation in Elastic Solids, 3. repr. (1980)
    Elsevier
    In:  Amsterdam, Elsevier
    Details
    Publikationsdatum: 1980
    Schlagwort(e): Seismology ; Seismics (controlled source seismology) ; Wave propagation ; Waves ; Textbook of geophysics
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    BIBLIOGRAFIE SEISMOLOGIE
  • 6
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    Geschwindigkeitsuntersuchungen am Falkenberger Granit (1981)
    Inst. f. Geophys., Ruhr-Univ. Bochum
    In:  Diplomarbeit, Rome, Inst. f. Geophys., Ruhr-Univ. Bochum, vol. 10, no. 13, pp. 1431-1434, (ISBN 0 08 042822 3)
    Details
    Publikationsdatum: 1981
    Schlagwort(e): Velocity ; Physical properties of rocks ; Laboratory measurements ; Instruments ; Wohrl
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    BIBLIOGRAFIE SEISMOLOGIE
  • 7
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    Modellseismische Untersuchungen über den Einfluß von Bergmitteleinlagerungen in tektonisch ungestörten und gestörten Kohleflözen auf die Ausbreitung von Rayleigh Flözwellen (1981)
    Inst. f. Geophys., Ruhr-Univ. Bochum
    In:  Diplomarbeit, Tokyo, Inst. f. Geophys., Ruhr-Univ. Bochum, vol. C 560, 183 pp., no. 29, pp. 1321-1323, (ISBN 3-933346-037)
    Details
    Publikationsdatum: 1981
    Schlagwort(e): SEModelling ; Channel waves ; Mining geophysics ; Rayleigh waves ; Kuhbach
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    BIBLIOGRAFIE SEISMOLOGIE
  • 8
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    Untersuchungen von Bruch- und Scherprozessen im Granit und Serpentinit bei hohen Drücken und Temperaturen (1981)
    Inst. f. Geophys., Ruhr-Univ. Bochum
    In:  Dissertation, Berichte, Houston, Inst. f. Geophys., Ruhr-Univ. Bochum, no. 10, pp. 103-155
    Details
    Publikationsdatum: 1981
    Schlagwort(e): Stress ; cracks and fractures (.NE. fracturing) ; Fracture ; Laboratory measurements
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    BIBLIOGRAFIE SEISMOLOGIE
  • 9
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    Home occupancy by male Octopus vulgaris in a large seawater tank (1980)
    Elsevier
    In:  Animal Behaviour, 28 (4). pp. 1123-1126.
    Details
    Publikationsdatum: 2017-02-01
    Beschreibung: Pairs of individually recognizable male Octopus vulgaris were observed in a large seawater tank containing two suitable homes (brick pots or plastic buckets). None of the animals established exclusive occupancy of one home and for much of the time both animals were associated together at the same site. Usually one of the two homes was preferred and its occupant was most likely to be the larger animal, or the earlier resident if they were of equal size. Large animals were observed to take food forcefully from smaller octopus. An arm alignment interaction is described which, it is suggested, may be a means by which two octopuses establish their relative sizes.
    Materialart: Article , PeerReviewed
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  • 10
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    Sectional representations for simulating aerosol dynamics (1980)
    Elsevier
    In:  Journal of Colloid and Interface Science, 76 (2). pp. 541-556.
    Details
    Publikationsdatum: 2016-11-30
    Beschreibung: A general method for simulating aerosol size distribution dynamics is developed. The method, based on dividing the particle size domain into sections and dealing only with one integral quantity in each section (e.g., number, surface area, or volume), has the advantages that the integral quantity is conserved within the computational domain and coagulations between all particle sizes are properly accounted for. To demonstrate the simplicity and accuracy of the method for a practical problem, the evolution of a power plant plume aerosol undergoing coagulation is simulated.
    Materialart: Article , PeerReviewed
    Format: text
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    ARTIKEL (OCEANREP)
  • 11
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    Large allochthonous sediment masses and their role in the construction of the continental slope and rise off southwestern Africa (1980)
    Elsevier
    In:  Marine Geology, 37 (3-4). pp. 333-354.
    Details
    Publikationsdatum: 2016-04-12
    Beschreibung: Large Neogene slumps have affected over 260,000 km2 of the outer continental margin and adjacent Cape Basin off southwestern Africa. Individual structures cover areas up to 68,700 km2 and proximally are commonly composed of huge rotated sediment blocks up to 450 m thick and several kilometers across. Seismic shocks, possibly in conjunction with lower-slope undercutting by bottom-current erosion, are suggested as possible trigger mechanisms for these features which are all thought to be post-Pliocene (possibly Pleistocene) in age. Older slumps are also recognized along the margin and four cycles of sedimentation/slumping are identified: early Upper Cretaceous (I); late Upper Cretaceous (II); Palaeogene (III); and Neogene (IV). In the main part of the Orange Basin depocentre (west of Childs Bank) the Cretaceous slump styles are thought to represent Mississippi delta-type down-slope sediment cascades (with reverse faulting and mud diapirism) over 1 km thick which resulted from very rapid dumping of terrigenous material from the Orange River. Cainozoic slumps show a different tectonic style and locus and this is thought to reflect a change in sedimentation patterns which resulted from lower terrigenous input onto the margin, higher biogenic/authigenic sedimentation, and slowed crustal subsidence. A connection possibly exists between low sea level stands and the Cainozoic episodes of slumping.
    Materialart: Article , PeerReviewed
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  • 12
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    Compositions of deep-sea ash layers derived from north pacific volcanic arcs: variations in time and space (1980)
    Elsevier
    In:  Journal of Volcanology and Geothermal Research, 7 (1-2). pp. 107-137.
    Details
    Publikationsdatum: 2016-09-12
    Beschreibung: Glass separates from 115 ash layers derived from the Kamchatkan (DSDP Site 192; 34 layers), the eastern Aleutian (DSDP Site 183; 56 layers) and the Alaska Peninsula (DSDP Site 178; 25 layers) volcanic arcs have been analyzed for up to 28 elements. In addition, the abundance and diversity of associated mafic phenocrysts have been evaluated. The resulting data set has made possible an evaluation of the late Miocene to Recent changes in composition of ashes derived from North Pacific volcanic arcs and of the factors controlling the evolution of highly siliceous magmas. We find no evidence for a general transition from arc tholeiite to calc-alkalic magma parentage of ashes derived from the volcanic arcs during the last 10 m.y., but instead find 0.1- to 0.5-m.y. intervals during which particular types of volcanism are prevalent. Most convincing is the transition from arc tholeiite to calc-alkalic for ashes derived from Kamchatka during the last 0.8 m.y., a change believed to be associated with a landward shift in the site of magma generation. Considered together, ashes derived from North Pacific volcanic arcs have been becoming more siliceous during the last 1.5 m.y. and may be associated with accelerated subduction during the same time interval. Hydrous phenocrysts (e.g., biotite) are typically associated with low-silica deep-sea ashes, but not with terrestrial volcanic rocks of comparable silica contents, suggesting the important role of water in the evolution of siliceous magma. REE patterns and relative abundances of mafic phenocrysts demonstrate the importance of fractional crystallization in controlling the evolution of highly siliceous arc magmas. REE increase with increasing silica, but become less concentrated in ashes with SiO2 〉 64%. Eu anomalies increase throughout the SiO2 range. Initial fractionation is dominated by clinopyroxene and plagioclase with amphibole strongly influencing fractionation above 64% SiO2.
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  • 13
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    Tectonic pattern of the Azores spreading centre and triple junction (1980)
    Elsevier
    In:  Earth and Planetary Science Letters, 51 (2). pp. 415-434.
    Details
    Publikationsdatum: 2021-03-01
    Beschreibung: The major tectonic elements of the Azores triple junction have been mapped using long-range side-scan sonar. The data enable the Mid-Atlantic Ridge axis to be located with a precision of a few kilometres. Major faults and other tectonic and volcanic elements of the ridge maintain their regional trend of 010° to 020° past the triple junction area. There is no oblique spreading, and only minor transform offsets of the Mid-Atlantic Ridge occur here. The main effect of the triple junction or Azores hot spot is to diminish the amplitude of the median valley to 200 m or less. There is no axial high: a topographic high seen on several profiles is located to the east of the Mid-Atlantic Ridge spreading axis and does not appear to have any fundamental significance. The third arm of the triple junction includes the Azores srreading centre which appears to have developed as a series of en echelon rifted basins (the Terceira Rift) extending from Formigas Trough at 36.8°N, 24.5°W to a point near 39.3°N, 28.8°W. There are indications that recent activity in the spreading centre may be concentrated in a series of ridges which flank the older rifted basins. Until recently the northwest end of the Terceira Rift was connected to the Mid-Atlantic Ridge axis either directly at an RRR junction, or via a transform fault. The triple junction has probably moved south during the last 6 Ma to a positin on the Mid-Atlantic Ridge near 38.7°N. Initiation of the Azores spreading centre may have occurred during the 36 Ma B.P. rearrangement of poles, with an RFF triple junction north from the East Azores fracture zone to the North Azores fracture zone and transferring a wedge of European plate to the African plate. The tectonic elements revealed by this study are in good agreement with inferred earthquake mechanisms and with the RM2 plate tectonic model of Minster and Jordan, but east-west motion between North America and Africa does not seem to be compatible with the other motions at the triple junction unless it is of very recent (2〉3 Ma) origin.
    Materialart: Article , PeerReviewed
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  • 14
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    Graben formation - the Maltese Islands - a case history (1981)
    Elsevier
    In:  Tectonophysics, 73 (1-3). pp. 151-168.
    Details
    Publikationsdatum: 2021-06-08
    Beschreibung: The structural setting of the Maltese Islands is governed by two rift systems of different ages and trends and the interference of both. Accompanying faults are exposed at many places along cliffs and belong to the most spectacular phenomena of rift faulting of the world. Malta is part of a wide shelf bridge that connects the Ragusa platform of southern Sicily and the Tripolitanian platform of northern Libya. The archipelago is underlain by a continental crust of African provenance. The older rift generation traversing the islands strikes about 50° to 70° to create a basin-and-range structure on western Malta, Comino and eastern Gozo. This micro-province is framed by two master faults at an average distance of 14 km. Crustal extension started during the Early Miocene, as observed by growth faulting and sedimentary dikes parallel to the future rift. A syndepositional uparching of about 200 m has preceded the physiographical rifting in post-Middle Miocene times. Discrete dip-slip faulting created an external wedge block, split by internal tilt blocks of antithetic character, both compensating an average 15% crustal spreading normal to the rift axis. Shoulder upwarping of approximately 120 m has evolved synchronously with the rifting. Structures of the first generation are crosscut by still active, second-generation rift faults, which on Malta strike about 120°, but on Gozo between 80° and 90°. These faults are associated with the Pantelleria rift, whose deep trough sets immediately south of the islands. Rifting was mainly originated during Late Miocene/Early Pliocene time to continue in parts up to the Present. A set of transform faults runs through the straits on both sides of Comino to form a complicated en echelon or Riedel shear structure on easternmost Gozo and westernmost Malta. Shoulder upwarping related to the Pantelleria rift has considerably tilted the block of Malta NNE-ward and caused the inundated river valleys of the natural harbour of Valletta. The superimposition of two rift structures of different trends has been caused principally by a rotation of the controlling stress regime about 10 m.y. ago. The active Afro—Eurasian collision front is located about 200 km north and northwest of the islands. A contemporary change of plate tectonic stresses is discussed to explain the intraplate rift pattern on Malta as foreland-specific reactions to plate tectonic processes.
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  • 15
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    Phosphate regeneration from sediments of the Peru continental margin by dissolution of fish debris (1981)
    Elsevier
    In:  Geochimica et Cosmochimica Acta, 45 (4). pp. 577-588.
    Details
    Publikationsdatum: 2016-03-01
    Beschreibung: Generally, oxidative regeneration of phosphate from anoxic sediments is by microbially mediated sulfate reduction processes. Stoichiometric modelling of such reactions takes into consideration varying proportions of ‘decomposable’ organically bound P to account for the ratios among nutrients in depth-concentration profiles of near-surface sediments. New results of interstitial water composition from sediments underlying the water masses influenced by coastal upwelling of the eastern boundary current system off Peru indicate that dissolution of phosphatic fish debris represents a mechanism for remineralization of phosphate comparable to or larger in magnitude than that by oxidative regeneration of organically bound P. Dissolved interstitial phosphate from fish debris is revealed by an excess amount of phosphate over that predicted from a simple stoichiometric oxidative regeneration model and by anomalously high dissolved interstitial fluoride concentrations. Phosphate flux estimates based on diffusion from the sediment suggest that this mechanism may generate up to 10% of the nutrient pool in the waters of the Peru undercurrent. Partitioning of P among the two sources reveals further that fish debris phosphate is about four times more important than organically bound P in nutrient generation from sediments of the Peru continental margin. Not only does this mechanism of regeneration affect the nutrient cycling but may also control widespread phosphorite formation in this area.
    Materialart: Article , PeerReviewed
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  • 16
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    The Ultrastructure of Skeletogenesis in Hermatypic Corals (1980)
    Elsevier
    In:  International Review of Cytology, 67 . pp. 171-214.
    Details
    Publikationsdatum: 2018-10-29
    Beschreibung: This chapter discusses coral skeletogenesis, focusing on the morphology of the skeletogenic tissues. It reviews the light and electron microscope studies carried out in this regard, illustrating the example of the morphology of the skeletogenic tissues of the coral Pocillopora damicornis. A structural organic matrix is present in the adult skeleton of Pocillopora damicornis. One component of this structural matrix is present transiently at the growth surface of the skeleton. It consists of individual sheaths enveloping each forming aragonite crystal. These crystal sheaths, plus some small extracellular vesicles that are presumed to represent a precursor for the sheaths, are together implicated in the hypotheses for coral calcification. The hypotheses fall into the following three broad categories: (1) algal removal of possible inhibitory substances; (2) a general stimulatory effect of algal metabolism; and (3) algal contribution to a skeletal organic matrix.
    Materialart: Article , PeerReviewed
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  • 17
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    Patterns of groundwater salinity changes in a deep continental-oceanic transect off the southeastern Atlantic coast of the U.S.A. (1981)
    Elsevier
    In:  Journal of Hydrology, 54 (1-3). pp. 95-105.
    Details
    Publikationsdatum: 2018-07-25
    Beschreibung: Investigations of formation-fluid salinities in a transect from western Georgia to the edge of the Blake Plateau off the coast of Georgia show surprisingly similar hydrochemical features offshore and onshore. A fresh-brackish wedge of groundwater (〈25 g/kg total dissolved solids) lies beneath the shelf to a depth of ∼ 900 m. On land, brackish waters extend to a maximum depth of ∼ 1.2 km below sea level in Lowndes County, Georgia. In deeper horizons, hypersaline brines (〉 100 g/kg) occur in Lower Cretaceous (?) strata. These strata have a pronounced evaporitic (anhydritic) character in the offshore segment. Strong salinity gradients in interstitial waters signify buried evaporite deposits at drill sites beneath the Blake Plateau.
    Materialart: Article , PeerReviewed
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