Harold Magistrale, Keith McLaughlin, Steven Day

A geology-based 3D velocity model of the Los Angeles basin sediments

  • Geochemistry and Petrology
  • Geophysics

Abstract Seismic hazard studies of the Los Angeles basin area require a realistic seismic-velocity model. We use geologic information about depth to crystalline basement, depths to sedimentary horizons, uplift of sediments, and surface geology in a velocity-depth-age function to construct a three-dimensional velocity model. In earthquake location tests, the model predicts travel times satisfactorily, and in earthquake ground-motion simulations, the model correctly determines the timing and amplitude of late-arriving waves.

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