Three‐Dimensional Basin Depth Map of the Northern Los Angeles Basins from Gravity and Seismic Measurements

Abstract The San Gabriel, Chino, and Bernardino sedimentary basins in Southern California amplify earthquake ground motions prolong the duration of shaking due to basins' shape low seismic velocities. In event a major rupture along southern segment Andreas fault, their connection physical proximity Los Angeles (LA) can produce waveguide effect strong motions. Improved estimates depth sediment‐basement interface are needed for more accurate ground‐shaking models. We obtain three‐dimensional basement map by integrating gravity measurements. travel time P ‐to‐ S conversion, Bouguer 10 lines, combined linear relationship that is used extend 2D profiles 3D basin map. Basement calculated using predicted constrained with an ‐wave velocity model area. further depths from 17 boreholes. shows south‐central part Gabriel deepest significant signature associated our interpretation Raymond fault. Chino deepens toward south shallows northeastward. eastward edge Jacinto Fault Zone. addition, we demonstrate benefit data aid receiver functions.