Physics
Scientific paper
Apr 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991pepi...66..253c&link_type=abstract
Physics of the Earth and Planetary Interiors, Volume 66, Issue 3-4, p. 253-258.
Physics
Scientific paper
The largest offshore earthquake that has occurred west of northern Baja California has been studied. Recalculated magnitudes are mb = 5.4 and Ms = 6.2. P-wave first motions, polarization of the S waves and wave form modeling were used to calculate the fault plane solution and source parameters. The source mechanism indicates a right-lateral strike-slip fault with a plane that strikes 309° and dips 76° northwest, and a compressional axis that trends approximately north-south. It was not possible to relocate this event; therefore, it cannot be determined whether it occurred in the Maximinos or the San Isidro fault; these faults have a different trend (330°) from the strike of the inferred fault plane. Body-wave modeling gave a seismic moment of 1.8 +/- 0.5 × 1025 dyn cm and constrained the source depth to 8 +/- 2 km. The dislocation time function indicates a simple rupture pattern with a total duration of 8 +/- 1.2 s. Apparent stress calculated from the relation of Kanamari and Anderson was 20 bars.
Cruces Francisco J.
Rebollar Cecilio J.
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