Structure of the Northern Los Angeles Basins Revealed in Teleseismic Receiver Functions from Short‐Term Nodal Seismic Arrays
Abstract
We use teleseismic receiver functions computed from an ∼35‐day nodal dataset recorded along three profiles in the northern basins of Los Angeles, California, to map the depth and shape of the sediment–basement interface and to identify possible deep fault offsets. The results show the Moho discontinuity, the bottom of the basement, and intermediary sedimentary layers. There are also indications of midcrustal offsets along strike of the Red Hill and Raymond faults. The results are compared with receiver functions from nearby permanent broadband stations and the 1993 Los Angeles Region Seismic Experiment (LARSE) profile. The images show that dense deployments of node‐type sensors can be used to characterize basin structure in a noisy urban environment.
Additional Information
© 2018 Seismological Society of America. Published Online 1 August 2018. Data and Resources: The broadband seismograms used in this study were downloaded from the Incorporated Research Institutions for Seismology (IRIS) Data Management Center (DMC) at www.iris.edu (last accessed October 2017) or from the Southern California Earthquake Data Center using the Seismogram Transfer Program (STP) at http://scedc.caltech.edu/research-tools/stp/STPdocumentation.html (last accessed February 2018). Nodal data were collected by the three deployments operated by Louisiana State University, the California Institute of Technology, and the University of Utah. Seismic data from the SG1 line are archived at the IRIS DMC (Persaud, 2017; doi: 10.7914/SN/XG_2017); the presented data from SG2 and SB4 can be obtained from the authors. Event origin times and locations were obtained from the IRIS Data Service at https://ds.iris.edu/wilber3/find_event (last accessed October 2017). Active faults were compiled from the 2010 Fault Activity Map of California (Jennings and Bryant, 2010). The broadband and nodal waveforms were all preprocessed using the Seismic Analysis Code (SAC) software (Goldstein et al., 2003), and the figures were all prepared with the Generic Mapping Tool (GMT) software (Wessel et al., 2013) and SAC. The authors thank Massimo Di Bona for providing the codes for calculating the receiver functions and Nicola Piana Agostinetti for his advice on the use of the codes. The authors are grateful to the deployment and pickup crews from the California State Polytechnic University, Pomona, local California high schools, the Jet Propulsion Laboratory, California Institute of Technology, and Louisiana State University who helped with the fieldwork; the Los Angeles area homeowners for their willingness to host the nodes, and Bridget O'Neill and Noel Barstow for their help coordinating the Incorporated Research Institutions for Seismology (IRIS) Portable Array Seismic Studies of the Continental Lithosphere (PASSCAL) nodes that were deployed along SG1. The authors thank Carl Tape, an anonymous reviewer, Editor‐in‐Chief Zhigang Peng, and Guest Editors Marianne Karplus and Brandon Schmandt for their thoughtful and constructive comments that helped improve the article. G. L. and P. P. thank the Geology and Geophysics Department at Louisiana State University for supporting this project. This research was partially supported by the U.S. Geological Survey (USGS) Award GS17AP00002.Attached Files
Supplemental Material - srl-2018071_esupp.zip
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Additional details
- Eprint ID
- 88490
- Resolver ID
- CaltechAUTHORS:20180802-082417478
- Louisiana State University
- GS17AP00002
- USGS
- Created
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2018-08-02Created from EPrint's datestamp field
- Updated
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2021-11-16Created from EPrint's last_modified field
- Caltech groups
- Seismological Laboratory, Division of Geological and Planetary Sciences