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) Vol. 270; no. 5242; pp. 1628 - 1632
Main Authors:	Olsen, Kim B., Archuleta, Ralph J., Matarese, Joseph R.
Format:	Journal Article
Language:	English
Published:	Washington, DC American Society for the Advancement of Science 08-12-1995 American Association for the Advancement of Science The American Association for the Advancement of Science
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 United States North America California San Andreas Fault Los Angeles California United States > US San Andreas Fault Los Angeles Basin finite difference analysis simulation S-waves elastic waves ground motion velocity earthquakes rupture amplitude surface waves propagation three-dimensional models fault displacements magnitude hypocenter topographic maps seismic risk
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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.
Bibliography:	ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23
ISSN:	0036-8075 1095-9203
DOI:	10.1126/science.270.5242.1628