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Seismic evidence for a fossil slab origin for the Isabella anomaly

Dougherty, Sara L. and Jiang, Chengxin and Clayton, Robert W. and Schmandt, Brandon and Hansen, Steven M. (2021) Seismic evidence for a fossil slab origin for the Isabella anomaly. Geophysical Journal International, 224 (2). pp. 1188-1196. ISSN 0956-540X.

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A teleseismic receiver function image of a slab-like feature that extends from the Pacific coast to the foothills of the Sierra Nevada beneath central California connects the expected location of the subducted remnant of the Monterey microplate to the high-velocity Isabella anomaly in the upper mantle. The observed structure indicates that this anomaly is a relic of the subduction zone that preceded capture of the Monterey microplate by the Pacific plate and is not due to the delamination of the lithosphere beneath the Sierra Nevada Mountains, as had been previously proposed. The fossil slab connection is also supported by surface wave tomographic images. The images are derived in part from a new linear broad-band array across the western part of central California.

Item Type:Article
Related URLs:
URLURL TypeDescription waveform data
Dougherty, Sara L.0000-0002-5327-3286
Jiang, Chengxin0000-0002-8768-2782
Clayton, Robert W.0000-0003-3323-3508
Schmandt, Brandon0000-0003-1049-9020
Additional Information:© The Author(s) 2020. Published by Oxford University Press on behalf of The Royal Astronomical Society. This article is published and distributed under the terms of the Oxford University Press, Standard Journals Publication Model ( Accepted 2020 September 29. Received 2020 September 27; in original form 2020 March 7. Published: 05 October 2020. Seismic waveform data from the CCSE array (CCSE, doi: 10.7909/C3B56GVW) and other broad-band networks used in this study are available from the Incorporated Research Institutions for Seismology Data Management Center. Earthquake catalogue data were obtained from the Advanced National Seismic System Comprehensive Earthquake Catalog and the International Seismological Centre Bulletin event catalogue and are provided in the Supporting Information. We are grateful to Richard Guy and Charles Hoots for their work installing the CCSE array. We thank the Gordon and Betty Moore Foundation through the Tectonics Observatory at Caltech for the use of the instruments. We also thank Editor Ana Ferreira, Robert Porritt and an anonymous reviewer for helpful comments which improved the manuscript. This research was supported by NSF EAR-1314910 and EAR-1315856.
Group:Seismological Laboratory
Funding AgencyGrant Number
Gordon and Betty Moore FoundationUNSPECIFIED
Caltech Tectonics ObservatoryUNSPECIFIED
Subject Keywords:Body waves; Interface waves; Seismic tomography; Crustal structure; Subduction zone processes
Issue or Number:2
Record Number:CaltechAUTHORS:20210225-144902662
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Official Citation:Sara L Dougherty, Chengxin Jiang, Robert W Clayton, Brandon Schmandt, Steven M Hansen, Seismic evidence for a fossil slab origin for the Isabella anomaly, Geophysical Journal International, Volume 224, Issue 2, February 2021, Pages 1188–1196,
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:108218
Deposited By: Tony Diaz
Deposited On:26 Feb 2021 00:21
Last Modified:26 Feb 2021 00:21

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