San Gabriel River Shallow Vs Transect

San Gabriel River Shallow Vs Transect A 60-km long cross section of the upper 200 m of the Los Angeles and San Gabriel basins, at 100X vertical exaggeration, showing measured shear-wave speed. Red-orange regions indicate soils that would strongly amplify ground shaking during an earthquake. The section was derived using seismic surface waves from urban background noise sources. (Image from W.A. Thelen, M. Clark, C.T. Lopez, C. Loughner, H. Park, J.B. Scott, S.B. Smith, B. Greschke, and J.N. Louie, 2006. A transect of 200 shallow shear-velocity profiles across the Los Angeles Basin, Bulletin of the Seismological Society of America, 96(3):1055–1067, ©Seismological Society of America.)

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