Results 161 to 170 of about 77,777 (186)

Tectonic stresses South Bay Mine, Canada

Geologische Rundschau, 1978
The South Bay copper-zinc-silver orebody, 52 miles east of Red Lake in northwestern Ontario, lies in refolded siliceous volcanic rocks near the close of an Archaean volcanic cycle. The rock mass mechanics events at South Bay mainly happened during the endogenesis and uplift of the earth's crust at the Birch-Uchi greenstone belt.
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Tectonic Stress Reconstruction Based on Structural Features in Tectonic Superposition Areas

Mining, Metallurgy & Exploration, 2020
Tectonic stress is an important parameter for understanding the dynamics of underground engineering and for the exploitation of coalbed methane. Multiple-period structural features usually have complex spatial relationships in tectonic superposition areas, which provides evidence for identification of the sequence of the tectonic stress period ...
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Numerical Simulation of Tectonic Stress Field in Longmenshan Tectonic Belts after Earthquake

Applied Mechanics and Materials, 2012
Two-dimensional finite element model of Longmenshan area was built on the basis of depth study on geological structure conditions and of rock mechanical properties in Longmenshan area, tectonic stress field and variation process of Longmenshan fault belt were inversed after the earthquake.
Sheng Rui Su, Hu Jun He, Ying Zhang, Peng Li   +3 more
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Tectonic stress field in East Eurasia

Physics of the Earth and Planetary Interiors, 1983
Abstract The overall pattern of the recent tectonic stress field in the eastern part of the Eurasian plate is inferred from the geological features of large transcurrent and reverse faults, graben structures and from focal mechanism solutions of shallow earthquakes. NE-SW striking trajectory lines, of maximum horizontal tectonic stress axis (σ Hmax),
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Apparent stress and stress drop for intraplate earthquakes and tectonic stress in the plates

pure and applied geophysics, 1977
The magnitude of shear stress in the lithosphere is bounded from below by the apparent stress and stress drop during intraplate earthquakes. Apparent stresses and stress drops for a number of mid-plate earthquakes are calculated from the earthquake magnitude, SH wave amplitude spectra, and estimates of the length of the fault zone.
Randall M. Richardson, Sean C. Solomon
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Stress variability and brittle tectonic structures

Earth-Science Reviews, 2005
The problem of stress variability, both in space and time, during brittle deformation of rocks is faced in this note. Several possible causes of the temporal and spatial variations of the stress tensor are reviewed and discussed. A genetic partitioning of the stress tensor is proposed, showing that any stress field within a crustal volume can be seen ...
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The sources of lithospheric tectonic stresses

Philosophical Transactions of the Royal Society of London. Series A: Physical and Engineering Sciences, 1991
The stresses associated with large-scale tectonic deformation have three possible origins: (1) plate-boundary forces counterbalanced by viscous drag beneath the plates; (2) density heterogeneities situated within the plates (say at depths shallower than 200 km); (3) mass heterogeneities in the deep mantle.
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Seismic activation of tectonic stresses by mining

Journal of Seismology, 2013
Hard coal mining in the area of the Bytom Syncline (Upper Silesia Coal Basin, Poland) has been associated with the occurrence of high-energy seismic events (up to 109 J; local magnitude up to 4.0), which have been recorded by the local mining seismological network and regional seismological network. It has been noticed that the strongest seismic events
Henryk Marcak, Grzegorz Mutke
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Tectonic stress field in the Indian subcontinent

Journal of Geophysical Research: Solid Earth, 1992
A map of maximum horizontal compressive stress orientation in the Indian subcontinent has been prepared using orientations derived from three different stress indicators: borehole elongation breakouts, in situ hydraulic fracturing measurements, and earthquake focal mechanisms. Most part of the subcontinent appears to be characterized by a compressional
T. N. Gowd, S. V. Srirama Rao, V. K. Gaur   +2 more
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Tectonic stress distribution of New Zealand

New Zealand is considered as one of the most active earthquake sources in the world, experiencing the deadly 2011 M6.3 at Christchurch, as well as more than 180,000 earthquakes from 1964 to 2016. One important parameter in earthquake statistics is the b value in the frequency magnitude distribution (Gutenberg and Richter, 1954).
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