A Caltech Library Service

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

Villa, Valeria and Li, Yida and Clayton, Robert W. and Persaud, Patricia (2022) Three-Dimensional Basin Depth Map of the Northern Los Angeles Basins from Gravity and Seismic Measurements. . (Unpublished)

[img] PDF - Submitted Version
Creative Commons Attribution.

[img] PDF - Supplemental Material
Creative Commons Attribution.


Use this Persistent URL to link to this item:


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

Item Type:Report or Paper (Discussion Paper)
Related URLs:
URLURL TypeDescription Paper basin depth model
Villa, Valeria0000-0002-0518-9143
Li, Yida0000-0003-0664-0247
Clayton, Robert W.0000-0003-3323-3508
Persaud, Patricia0000-0003-3462-7023
Additional Information:Attribution 4.0 International (CC BY 4.0). We are grateful to the hundreds of nodal deployment volunteers, Los Angeles residents, and business owners who hosted our instruments. We thank Liu et al. (2018), Wang et al. (2021), and Ghose et al. (2022)for providing their receiver function results. This research was supported by the National Science Foundation awards 2105358 and 105320. The BASIN project was partly supported by U.S. Geological Survey awards GS17AP00002 and G19AP00015, and Southern California Earthquake Center awards 18029 and 19033. Data collection was supported by Louisiana State University and California Institute of Technology. Nodal instruments were provided by Incorporated Research Institutions for Seismology (IRIS), Portable Array Seismic Studies of the Continental Lithosphere (PASSCAL), University of Utah, Louisiana State 505University, and the University of Oklahoma. Data Availability Statement. The basement time was obtained from Liu et al. (2018), Wang et al. (2021), and Ghose et al. (2022). Li et al. (2022) provided the shear-wave velocity model. The basement depths obtained from well logs are publicly available through the Geologic Energy Management Division's (CalGEM) online mapping application Well Finder Buwalda (1940). The Bouguer gravity data was provided by the Pan American CenterEarth and Environmental Science portal. Figures were plotted using the GMT software, PyGMT, and cartopy (Met Office, 2010; Uieda et al., 2022; Wessel et al., 2019). The 3D basin depth model is available at
Group:Seismological Laboratory
Funding AgencyGrant Number
Southern California Earthquake Center (SCEC)18029
Southern California Earthquake Center (SCEC)19033
Record Number:CaltechAUTHORS:20220815-504409000
Persistent URL:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:116279
Deposited By: George Porter
Deposited On:16 Aug 2022 16:18
Last Modified:16 Aug 2022 16:18

Repository Staff Only: item control page