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Active faulting and deformation of the Coalinga anticline as interpreted from three-dimensional velocity structure and seismicity

Journal of Geophysical Research
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Abstract

This work gives a clear picture of the geometry of aftershock seismicity in a large thrust earthquake. Interpretation of hypocenters and fault plane solutions, from the 1983 Coalinga, Coast Range California, earthquake sequence, in combination with the three-dimensional velocity structure shows that the active faulting beneath the fold primarily consists of a set of southwest dipping thrusts uplifting blocks of higher-velocity material. With the three-dimensional velocity model each individual hypocenter moved slightly (0-2km) in accord with the details of the surrounding velocity structure, so that secondary features in the seismicity pattern are more detailed than with a local one-dimensional model and station corrections. The overall character of the fault plane solutions was not altered by the three-dimensional model, but the more accurate ray paths did result in distinct changes. In particular, the mainshock has a fault plane dipping 30?? southwest instead of the 23?? obtained with the one-dimensional model. -from Author

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Active faulting and deformation of the Coalinga anticline as interpreted from three-dimensional velocity structure and seismicity
Series title Journal of Geophysical Research
Volume 94
Issue B11
Year Published 1989
Language English
Larger Work Type Article
Larger Work Subtype Journal Article
Larger Work Title Journal of Geophysical Research