3-DIMENSIONAL SIMULATION OF A MAGNITUDE-7.75 EARTHQUAKE ON THE SAN-ANDREAS FAULT

Simulation of 2 minutes of long-period ground motion in the Los Angele s area with the use of a three-dimensional finite-difference method on a parallel supercomputer provides an estimate of the seismic hazard f rom a magnitude 7.75 earthquake along the 170-kilometer section of the San Andreas fault between Tejon Pass and San Bernardino. Maximum grou nd velocities are predicted to occur near the fault (2.5 meters per se cond) and in the Los Angeles basin (1.4 meters per second) where large amplitude surface waves prolong shaking for more than 60 seconds. Sim ulated spectral amplitudes for some regions within the Los Angeles bas in are up to 10 times larger than those at sites outside the basin at similar distances from the San Andreas fault.