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Shallow seismicity in the Long Beach-Seal Beach, California area

Yan Yang and Robert W. Clayton
Shallow seismicity in the Long Beach-Seal Beach, California area
Seismological Research Letters (April 2023) 94 (4): 1948-1956


Seismicity can help to locate fault zones that are often difficult to characterize in densely populated urban areas. In this study, we use three dense nodal arrays consisting of thousands of sensors to detect and locate seismic events in the Long Beach-Seal Beach area of California. Small events can be detected at sufficient signal-to-noise levels during the night, when urban noise is relatively low. We detect and locate >1000 events with M (sub L) below 2. Most of the located events are clustered at very shallow depth (0-2 km). The results support previous suggestions that the shallow Newport-Inglewood fault is a wide splayed fault in this area. The seismicity pattern also compares well with some newly identified faults from reflection seismic surveys. The shallow events, which elude detection by the regional seismic network, underscore the complex nature of the faults and their seismic hazard.

ISSN: 0895-0695
EISSN: 1938-2057
Serial Title: Seismological Research Letters
Serial Volume: 94
Serial Issue: 4
Title: Shallow seismicity in the Long Beach-Seal Beach, California area
Affiliation: California Institute of Technology, Seismological Laboratory, Pasadena, CA, United States
Pages: 1948-1956
Published: 20230405
Text Language: English
Publisher: Seismological Society of America, El Cerrito, CA, United States
References: 47
Accession Number: 2023-028797
Categories: Seismology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 table, sketch map
N33°57'00" - N34°00'00", W118°49'60" - W118°00'00"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2024, American Geosciences Institute. Abstract, Copyright, Seismological Society of America. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 202319
Program Name: SDG 11Sustainable Cities and Communities
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