Mathematics – Logic
Scientific paper
Nov 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994georl..21.2345s&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 21, no. 22, p. 2345-2348
Mathematics
Logic
2
France, Geological Faults, Plates (Tectonics), Seismology, Shear Stress, Stress Distribution, Stress Propagation, Tectonics, Amplitudes, Earthquakes, Magnetic Measurement, Magnetic Properties, Tables (Data)
Scientific paper
Focal mechanisms of 31 Central France earthquakes (m(sub b) = 2.9-4.4) were evaluated to determine if slip is compatible with stress field determinations conducted at four nearby sites. The coherent picture that results indicates that the regional stress fields can be inferred by linear extrapolation of in-situ measurements performed between 400-1000 m depths. Furthermore, the results show that in spite of rather constant principal stress directions from one site to the next (100 km apart), principal stress amplitudes vary significantly. For the domain investigated (200x200 sq km), the size of the homogeneous stress field regions appears to be fairly small (about 100x100 sq km). In addition, within these regions, important local stress perturbations as identified by extremely inconsistent focal mechanisms, are present. Thus only by integrating different data types is it possible to map properly the regional stress field. This mapping provides means to identify the homogeneous regions as well as to highlight zones of local stress perturbations, most likely indicative of active faulting.
Cornet Francois H.
Scotti Oona
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