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Detailed Reference Information |
Bawden, G.W. (2001). Source parameters for the 1952 Kern County earthquake, California: A joint inversion of leveling and triangulation observations. Journal of Geophysical Research 106: doi: 10.1029/2000JB900315. issn: 0148-0227. |
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Coseismic leveling and triangulation observations are used to determine the faulting geometry and slip distribution of the July 21, 1952, Mw 7.3 Kern County earthquake on the White Wolf fault. A singular value decomposition inversion is used to assess the ability of the geodetic network to resolve slip along a multisegment fault and shows that the network is sufficient to resolve slip along the surface rupture to a depth of 10 km. Below 10 km, the network can only resolve dip slip near the fault ends. The preferred source model is a two-segment right-stepping fault with a strike of 51¿ and a dip of 75 ¿SW. The epicentral patch has deep (6--27 km) left-lateral oblique slip, while the northeastern patch has shallow (1--12.5 km) reverse slip. There is nearly uniform reverse slip (epicentral, 1.6 m; northeast, 1.9 m), with 3.6 m of left-lateral strike slip limited to the epicentral patch. The seismic moment is Mo=9.2¿0.5¿1019 N m (Mw=7.2). The signal-to-noise ratio of the leveling and triangulation data is reduced by 96% and 49%, respectively. The slip distribution from the preferred model matches regional geomorphic features and may provide a driving mechanism for regional shortening across the Comanche thrust and structural continuity with the Scodie seismic lineament to the northeast. ¿ 2001 American Geophysical Union |
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Abstract |
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Keywords
Seismology, Earthquake dynamics and mechanics, Seismology, Earthquake parameters, Tectonophysics, Continental neotectonics, Tectonophysics, Continental tectonics—general |
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Publisher
American Geophysical Union 2000 Florida Avenue N.W. Washington, D.C. 20009-1277 USA 1-202-462-6900 1-202-328-0566 service@agu.org |
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