Results 201 to 210 of about 84,535 (249)
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Predictions of shear-wave velocities in southern California using surface geology
Bulletin of the Seismological Society of America, 1998AbstractA new model of the average shear-wave velocity in the uppermost 30 m has been generated by extrapolation of discrete velocity profiles using surface geology at several scales. Statistical methods have been applied to create a map that is no more complicated than is supported by the velocity data; several geologic units with similar responses ...
Stephen K. Park, Scott D. Elrick
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A Site-Conditions Map for California Based on Geology and Shear-Wave Velocity
Bulletin of the Seismological Society of America, 2000One simple way of accounting for site conditions in calculating seismic hazards is to use the shear-wave velocity in the shallow subsurface to classify materials. The average shear-wave velocity to 30 m ( V 30s) has been used to develop site categories that can be used for modifying a calculated ground motion to account for site conditions.
G. Taylor +7 more
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Tectonophysics, 1997
Abstract A geostatistical approach is used to analyze the spatial distribution of fracture density in shear zones. The methodology proposed is illustrated with data obtained from the mapping of drift walls at the Henderson mine in the Chibougamau mining district, Quebec.
O. Tavchandjian +4 more
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Abstract A geostatistical approach is used to analyze the spatial distribution of fracture density in shear zones. The methodology proposed is illustrated with data obtained from the mapping of drift walls at the Henderson mine in the Chibougamau mining district, Quebec.
O. Tavchandjian +4 more
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Pure and Applied Geophysics, 1998
A brief outline is given on experimental studies carried out in the Minnesota Mineral and Rock Physics Laboratory of microstructural evolution and rheology of mantle mineral aggregates or their analogues, using a simple shear deformation geometry.
M. J. Daines +4 more
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A brief outline is given on experimental studies carried out in the Minnesota Mineral and Rock Physics Laboratory of microstructural evolution and rheology of mantle mineral aggregates or their analogues, using a simple shear deformation geometry.
M. J. Daines +4 more
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Seismic soil classification of Italy based on surface geology and shear-wave velocity measurements
Soil Dynamics and Earthquake Engineering, 2019Abstract During an earthquake the seismic wave amplification related to local site conditions can have a significant impact on the ground motion. In order to account for these local effects some proxies for the soil characteristics exist; e.g., the average shear-wave velocity of the upper 30 m ( V S , 30 ) , or the equivalent ...
Forte, Giovanni +5 more
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Geology and timing of dextral strike-slip shear zones in Danmarkshavn, North-East Greenland Caledonides [PDF]
Geological Magazine, 2006 The North-East Greenland eclogite province is divided into a western, central and eastern block by the sinistral Storstrømmen shear zone in the west and the dextral Germania Land deformation zone in the east. A family of steep, NNW-striking dextral mylonite zones in the Danmarkshavn area are geometrically and kinematically similar to the ductile ...
C. Sartini-Rideout +2 more
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Shearing Phenomena at High Pressure of Possible Importance for Geology
The Journal of Geology, 1936Various phenomena of plastic flow under shearing stress are studied at confining pressures up to $50,000 kg./cm.^2$ The shearing stress required to produce flow may-increase many fold beyond its normal value. There may be either "hardening" or "softening" phenomena while a steady state is being reached.
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Geology and genesis of Nalunaq Palaeoproterozoic shear zone-hosted gold deposit, South Greenland
Applied Earth Science, 2000AbstractThe Nalunaq deposit is a shear zone-hosted gold deposit characterized by very high grades (up to 5240 g Au/t over 0.8 m). The host rocks are Palaeoproterozoic metabasic rocks of the Nanortalik Nappe, which is part of the Ketilidian Mobile Belt. The Nanortalik Nappe consists of bedded massive pyrrhotite/graphitic chert horizons overlain by fine ...
L. Kludt, K. Kaltoft, D. M. Schlatter
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Shear Wave Velocity- and Geology-Based Seismic Microzonation of Port-au-Prince, Haiti
Earthquake Spectra, 2011A seismic site classification microzonation for the city of Port-au-Prince is presented herein. The microzonation is based on 35 shear wave velocity ( VS) profiles collected throughout the city and a new geologic map of the region. The VS profiles were obtained using the multichannel analysis of surface waves (MASW) method, while the geologic map was ...
Scott M. Olson +7 more
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Gently sloping shear zones in the Belomorian Mobile Belt: Geology, structure, and P–T parameters
Geotectonics, 2016The Belomorian Mobile Belt (BMB) in northern Karelia mostly consists of gently sloping shear zones, whose gneisses and migmatized amphibolites and blastomylonites are typically thinly banded, with their banding consistently dipping north- and northeastward.
V. M. Kozlovskii +9 more
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