Lianxing Wen -> Research -> Seismology -> Los Angeles Basin
Map of southern California, displaying major faults,
Los Angeles basin with seismic stations, two aftershocks, and
the Landers fault rupture. The dashed light contours indicate the isosurface of the
Los Angeles basin (from Yerkes, et al., 1965). OBG and DOW were triggered
by the mainshock of 1992 Lander's Earthquake.
The best-fitting model and associated ray paths are shown at the top
of the figure followed by two collumns of synthetics. Aftershock synthetics
(left) start with a prediction at PAS (Pasadena, hard rock site). Peak amplitudes
in cm are given above each trace. Simulations of the mainshock are
given on the right starting with the observation at Pasadena.
The synthetic at PAS for event 940801 fits the observation very well for this
The basin responses at OBG and DOW due to the different
types of incident energy. The top traces are the observed displacements.
The basin responses due to incident sSmS (reflected from surface and turned
back to surface by the Moho discontinuity), SmS (downdoing and turned back by the Moho),
sS8.5S (reflected from surface and turned back by an interface at
8.5 km depth) and direct upgoing wave are labeled as sSmS, SmS, sS8.5S and
Upgoing. Those responses are generated by convolving the transfer functions
related to each incident group of rays with moment rate function, obtained
by deconvolving the PAS aftershock from mainshock.