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Strong shaking in Los Angeles expected from southern San Andreas earthquake
Department of Geological Sciences, San Diego State University, San Diego, California, USA
Department of Geological Sciences, San Diego State University, San Diego, California, USA
Scripps Institution of Oceanography, University of California, San Diego, La Jolla, California, USA
San Diego Supercomputer Center, University of California, San Diego, La Jolla, California, USA
San Diego Supercomputer Center, University of California, San Diego, La Jolla, California, USA
San Diego Supercomputer Center, University of California, San Diego, La Jolla, California, USA
San Diego Supercomputer Center, University of California, San Diego, La Jolla, California, USA
Department of Earth Sciences, University of Southern California, Los Angeles, California, USA
Department of Earth Sciences, University of Southern California, Los Angeles, California, USA
The southernmost San Andreas fault has a high probability of rupturing in a large (greater than magnitude 7.5) earthquake sometime during the next few decades. New simulations show that the chain of sedimentary basins between San Bernardino and downtown Los Angeles form an effective waveguide that channels Love waves along the southern edge of the San Bernardino and San Gabriel Mountains. Earthquake scenarios with northward rupture, in which the guided wave is efficiently excited, produce unusually high long-period ground motions over much of the greater Los Angeles region, including intense, localized amplitude modulations arising from variations in waveguide cross-section.
Received 12 December 2005; accepted 27 February 2006; published 5 April 2006.
Citation: (2006), Strong shaking in Los Angeles expected from southern San Andreas earthquake, Geophys. Res. Lett., 33, L07305, doi:10.1029/2005GL025472.
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