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  • GEOPHYSICS  (14)
  • 1980-1984  (14)
Collection
Keywords
  • GEOPHYSICS  (14)
Years
Year
  • 1
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    Gravity anomalies and the structure of western Tibet and the southern Tarim Basin (1984)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Gravity anomalies across the western part of the Tarim Basin and the Kunlun mountain belt show that this area is not in local isostatic equilibrium. These data can be explained if a strong plate underlying the Tarim Basin extends southwestward beneath the belt at least 80 km and supports part of the topography of northwest Tibet. This corroborates Norin's inference that late Tertiary crustal shortening has occurred in this area by southward underthrusting of the Tarim Basin beneath the Kunlun. This study places a lower bound on the amount of underthrusting.
    Keywords: GEOPHYSICS
    Type: Geophysical Research Letters (ISSN 0094-8276); 11; 1251-125
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Seismicity, fault plane solutions, depth of faulting, and active tectonics of the Andes of Peru, Ecuador, and southern Colombia (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The long-period P waveforms observed for 17 earthquakes in the Peruvian Andes during 1963-1976 are compared with synthetic waveforms to obtain fault-plane solutions and focal depths. The morphological units of the Peruvian Andes are characterized: coastal plains, Cordillera Occidental, altiplano and central high plateau, Cordillera Oriental, and sub-Andes. The data base and analysis methodology are discussed, and the results are presented in tables, diagrams, graphs, maps, and photographs illustrating typical formations. Most of the earthquakes are shown to occur in the transition zone from the sub-Andes to the Cordillera Oriental under formations of about 1 km elevation at focal depths of 10-38 km. It is suggested that the sub-Andean earthquakes reflect hinterland deformation of a detached fold and thrust belt, perhaps like that which occurred in parts of the Canadian Rockies. From the total crustal shortening evident in Andean morphology and the shortening rate of the recent earthquakes it is estimated that the topography and crustal root of the Andes have been formed during the last 90-135 Myr.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research (ISSN 0148-0227); 88; 10403-10
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Focal depths and fault plane solutions of earthquakes under the Tibetan plateau (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Seismic data are used to place constraints on the focal depths and fault plane solutions of 16 crustal earthquakes beneath the highest parts of the Tibetan plateau. Synthetic seismograms were computed for large events from 1962 to 1976, and compared with the observed waveforms. All of the events studied are found to have occurred at depths less than 15 km and probably between 5 and 10 km, suggesting that the crust below 10-15 km is essentially aseismic, as in most of the Western United States. Fault-plane solutions show combinations of normal and strike slip faulting with T axes consistently oriented approximately east-west, supporting the inference that the upper crust of Tibet is actively extending in an east-west direction. In addition, solutions for two intermediate-depth events at depths of 90 and 85 km show primarily normal faulting with east-west T axes. Results show that brittle deformation occurs at shallow depths in the crust and in the uppermost mantle, but the lower crust seems to be aseismic.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research; 88; Feb. 10
    Format: text
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  • 4
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    The uppermost mantle P wave velocities beneath Turkey and Iran (1980)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Keywords: GEOPHYSICS
    Type: Geophysical Research Letters; 7; Jan. 198
    Format: text
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  • 5
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    A possible dependence of tectonic strength on the age of the crust in Asia (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: In Asia, the intensity and style of active tectonics appears to depend on the age of the last orogenic activity. The shields have remained essentially undeformed during the India-Eurasian collision, but Paleozoic and Mesozoic orogenic belts apparently have been reactivated by this collision, with a suggestion of greater reactivation and more diffuse deformation of the younger belts. If the greater observed heat flow in regions of more recent orogenic activity reflects, at least in part, a greater heat flow from the mantle beneath the younger belts, then the temperatures in the mantle beneath the younger belts should be higher than beneath older belts and shields. Because of the strong dependence on temperature of the creep strength of minerals, particularly of olivine, the crust and mantle beneath the hotter, younger belts should be much weaker than those beneath older belts. This difference in temperature, and consequent difference in strength, may be the cause of the greater reactivation of younger belts.
    Keywords: GEOPHYSICS
    Type: Earth and Planetary Science Letters; 52; 1, Ja; Jan. 198
    Format: text
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  • 6
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    Tectonic deformation of the Andes and the configuration of the subducted slab in central Peru: Results from a micro-seismic experiment (1983)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The vast majority of the microearthquakes recorded occurred to the east: on the Huaytapallana fault in the Eastern Cordillera or in the western margin of the sub-Andes. The sub-Andes appear to be the physiographic province subjected to the most intense seismic deformation. Focal depths for the crustal events here are as deep as 50 km, and the fault plane solutions, show thrust faulting on steep planes oriented roughly north-south. The Huaytapallana fault in the Cordillera Oriental also shows relatively high seismicity along a northeast-southwest trend that agrees with the fault scarp and the east dipping nodal plane of two large earthquakes that occurred on this fault in 1969. The recorded microearthquakes of intermediate depth show a flat seismic zone about 25 km thick at a depth of about 100 km. This agrees with the suggestion that beneath Peru the slab first dips at an angle of 30 deg to a depth of 100 km and then flattens following a quasi-horizontal trajectory. Fault plane solutions of intermediate depth microearthquakes have horizontal T axes oriented east-west.
    Keywords: GEOPHYSICS
    Type: NASA-CR-175445 , NAS 1.26:175445
    Format: application/pdf
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  • 7
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    Constraints on the structure of the Himalaya from an analysis of gravity anomalies and a flexural model of the lithosphere (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research (ISSN 0148-0227); 88; Oct. 10
    Format: text
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  • 8
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    Tectonic implications of the microearthquake seismicity and fault plane solutions in southern Peru (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Because the contortion in the seismic zone in southern Peru is aligned approximately parallel to the direction of relative plate motion, rather than perpendicular to the coast of Peru, the position of the contortion need not migrate with respect to the overriding South American plate as the Nazca plate subducts beneath it, and the flow in the surrounding asthenosphere could be in a steady state. In addition, the position of the contortion defines the northern boundary of the volcanic arc in southern Peru. The inference that a wedge of asthenospheric material must overlie the downgoing slab for subduction-related volcanism to occur is thereby strengthened.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research (ISSN 0148-0227); 89; 6139-615
    Format: text
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  • 9
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    The configuration of the seismic zone and the downgoing slab in southern Peru (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Keywords: GEOPHYSICS
    Type: Geophysical Research Letters (ISSN 0094-8276); 11; 38-41
    Format: text
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  • 10
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    Geophysical study of the structure and processes of the continental convergence zones: Alpine-Himalayan belt (1983)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Studies of the structure of the continental collision zones using seismic and body waves, theoretical modelling of the thermal regime of the convergence processes, and studies of earthquake mechanisms and deformation aspects of the model are covered.
    Keywords: GEOPHYSICS
    Type: NASA-CR-170019 , NAS 1.26:170019 , SASR-1-3
    Format: application/pdf
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