Mathematics – Logic
Scientific paper
May 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995georl..22.1033m&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 22, no. 9, p. 1033-1036
Mathematics
Logic
18
California, Earthquakes, Geological Faults, Seismic Waves, Shock Waves, Wave Propagation, P Waves, Propagation Velocity, Three Dimensional Models, Velocity Distribution
Scientific paper
Aftershocks of the 1971 San Fernando and 1994 Northridge earthquakes were relocated using a three-dimensional velocity model that was derived from inverting P-wave travel time data. The hypocenters show clear orientations of the dipping fault planes. The San Fernando aftershocks form a plane extending from a depth of 15 km to the surface, dipping toward the northeast at about 40 deg. The Northridge aftershocks delineate a fault extendingg from a depth of 18 km up to about 5 km, dipping toward the southwest at about 40 deg. In the region the aftershocks overlap in map view, the San Fernando plane cuts off the Northridge plane at a depth of 5 to 8 km, preventing it from reaching the surface. The similar but oppositely dipping fault planes suggest a pair of conjugate planes reflecting a horizontal northeast-southwest compression.
Mori Jim J.
Wald David J.
Wesson Robert L.
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