Physics
Scientific paper
Jun 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001georl..28.2321w&link_type=abstract
Geophysical Research Letters, Volume 28, Issue 12, p. 2321-2324
Physics
13
Geodesy And Gravity: Crustal Movements-Interplate, Geodesy And Gravity: Instruments And Techniques, Tectonophysics: Plate Boundary-General, Tectonophysics: Instruments And Techniques
Scientific paper
A new analysis of velocities of geodetic markers straddling the San Andreas Fault System in southern California reveals that interseismic deformation is localized along a dozen sub-parallel narrow belts of high shear strain rate that correlate well with active geologic fault segments and locally with concentrated zones of microseismicity. High shear strain rates (0.3-0.95 μstrain/year) are observed northward and southward of the San Andreas fault's big bend, whereas the big bend itself is characterized by a diffuse low magnitude shear strain rate. Dilatational deformation is diffuse and of relatively low magnitude (<0.2 μstrain/year), with the highest contraction rates occurring in the Ventura and Los Angeles basins. Because no prior assumptions were made regarding the geology, tectonics, or seismicity of the region, our analysis demonstrates that geodetic observations alone can be used to detect active fault segments.
Bock Yehuda
Sudman Yonadav
Wdowinski Shimon
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