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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