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A Seismic Hazard Map Based on Geology and Shear‐wave Velocity in Rawalpindi–Islamabad, Pakistan
Acta Geologica Sinica - English Edition, 2021AbstractThe ‘twin cities’ district of Rawalpindi–Islamabad is among the most endangered seismic regions in Pakistan, with the seismic hazard assessed (0.32 g) to intensity IX MMI for a 475‐year return period. A seismic hazard map for Rawalpindi–Islamabad is presented herein, based on 85 shear‐wave velocity (VS) profiles obtained through geophysical H/V
Sarfraz KHAN +2 more
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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 Park, Scott Elrick
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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 ...
K. Kaltoft, D. M. Schlatter, L. Kludt
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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.
S. Karato +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.
S. Karato +4 more
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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 ...
Brady R. Cox +7 more
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International Journal of Earth Sciences, 2009
The Higher Himalayan Shear Zone (HHSZ) in the Sutlej section reveals (1) top-to-SW ductile shearing, (2) top-to-NE ductile shearing in the upper- and the lower strands of the South Tibetan Detachment System (STDSU, STDSL), and (3) top-to-SW brittle shearing corroborated by trapezoid-shaped minerals in micro-scale. In the proposed extrusion model of the
MUKHERJEE, S, KOYI, HA
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The Higher Himalayan Shear Zone (HHSZ) in the Sutlej section reveals (1) top-to-SW ductile shearing, (2) top-to-NE ductile shearing in the upper- and the lower strands of the South Tibetan Detachment System (STDSU, STDSL), and (3) top-to-SW brittle shearing corroborated by trapezoid-shaped minerals in micro-scale. In the proposed extrusion model of the
MUKHERJEE, S, KOYI, HA
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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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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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