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DOI: 10.1002/2015GL064942
论文题名:
Imaging widespread seismicity at midlower crustal depths beneath Long Beach, CA, with a dense seismic array: Evidence for a depth-dependent earthquake size distribution
作者: Inbal A.; Clayton R.W.; Ampuero J.-P.
刊名: Geophysical Research Letters
ISSN: 0094-8632
EISSN: 1944-8363
出版年: 2015
卷: 42, 期:15
起始页码: 6314
结束页码: 6323
语种: 英语
英文关键词: dense array analysis ; earthquake scaling ; microseismicity
Scopus关键词: Beaches ; Geophysics ; Oil fields ; Seismic waves ; Seismology ; Signal to noise ratio ; Size distribution ; Anthropogenic activity ; Dense arrays ; Downward continuation ; Earthquake size distribution ; Event size distribution ; Long Beach , California ; Microseismicity ; Temporal clustering ; Earthquakes ; array ; crustal structure ; earthquake magnitude ; geophone ; oil field ; power law ; seismicity ; signal-to-noise ratio ; spatial distribution ; California ; Long Beach [California] ; United States
英文摘要: We use a dense seismic array composed of 5200 vertical geophones to monitor microseismicity in Long Beach, California. Poor signal-to-noise ratio due to anthropogenic activity is mitigated via downward-continuation of the recorded wavefield. The downward-continued data are continuously back projected to search for coherent arrivals from sources beneath the array, which reveals numerous, previously undetected events. The spatial distribution of seismicity is uncorrelated with the mapped fault traces, or with activity in the nearby oil-fields. Many events are located at depths larger than 20 km, well below the commonly accepted seismogenic depth for that area. The seismicity exhibits temporal clustering consistent with Omori's law, and its size distribution obeys the Gutenberg-Richter relation above 20 km but falls off exponentially at larger depths. The dense array allows detection of earthquakes two magnitude units smaller than the permanent seismic network in the area. Because the event size distribution above 20 km depth obeys a power law whose exponent is near one, this improvement yields a hundred-fold decrease in the time needed for effective characterization of seismicity in Long Beach. ©2015. American Geophysical Union. All Rights Reserved.
URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84940447303&doi=10.1002%2f2015GL064942&partnerID=40&md5=9eb3fd31fe27089f89e3a83a4e0163b5
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/8248
Appears in Collections:科学计划与规划
气候变化与战略

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作者单位: Seismological Laboratory, Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA, United States

Recommended Citation:
Inbal A.,Clayton R.W.,Ampuero J.-P.. Imaging widespread seismicity at midlower crustal depths beneath Long Beach, CA, with a dense seismic array: Evidence for a depth-dependent earthquake size distribution[J]. Geophysical Research Letters,2015-01-01,42(15).
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