Three-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 Angeles area with the use of a three-dimensional finite-difference method on a parallel supercomputer provides an estimate of the seismic hazard from a magnitude 7.75 earthquake along the 170-kilometer section of the San Andreas fault b...

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Bibliographic Details
Published in:Science (American Association for the Advancement of Science) 1995-12, Vol.270 (5242), p.1628-1632
Main Authors: Olsen, Kim B., Archuleta, Ralph J., Matarese, Joseph R.
Format: Article
Language:English
Subjects:
Amplitude
Cities
Earth sciences
Earth, ocean, space
Earthquakes
Earthquakes, seismology
Engineering and environment geology. Geothermics
Exact sciences and technology
Internal geophysics
Kinetics
Modeling
Natural hazards: prediction, damages, etc
Particle velocity
Research Article
S waves
Simulation
Simulations
Strikes
Tectonics. Structural geology. Plate tectonics
Three dimensional modeling
Velocity
Wave velocity
Workstations
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Summary:Simulation of 2 minutes of long-period ground motion in the Los Angeles area with the use of a three-dimensional finite-difference method on a parallel supercomputer provides an estimate of the seismic hazard from a magnitude 7.75 earthquake along the 170-kilometer section of the San Andreas fault between Tejon Pass and San Bernardino. Maximum ground velocities are predicted to occur near the fault (2.5 meters per second) and in the Los Angeles basin (1.4 meters per second) where large amplitude surface waves prolong shaking for more than 60 seconds. Simulated spectral amplitudes for some regions within the Los Angeles basin are up to 10 times larger than those at sites outside the basin at similar distances from the San Andreas fault.
ISSN:0036-8075
1095-9203
DOI:10.1126/science.270.5242.1628