DOI: 10.1007/s00531-015-1217-8
Scopus记录号: 2-s2.0-84940954421
论文题名: Rupture process for micro-earthquakes inferred from borehole seismic recordings
作者: Taira T. ; Dreger D.S. ; Nadeau R.M.
刊名: International Journal of Earth Sciences
ISSN: 14373254
出版年: 2015
卷: 104, 期: 6 起始页码: 1499
结束页码: 1510
语种: 英语
英文关键词: Earthquake rupture
; Earthquake stress drop
; Finite-source rupture inversion
; Hayward fault
Scopus关键词: borehole
; earthquake event
; earthquake magnitude
; earthquake rupture
; fault slip
; microearthquake
; seismic data
; seismic moment
; seismic source
; stress analysis
; California
; Hayward
; United States
英文摘要: We investigate the spatial extent of rupture and variability in fault slip for micro-earthquakes by inverting seismic moment rate functions derived from empirical Green’s function deconvolution. By using waveforms from an array of borehole seismometers, we determine the spatial distributions of fault slip for M 3+ earthquakes that occurred along the Hayward fault in central California and identify a variety of slip behaviors including subevents, directivity, and high stress drop. The 2013 Mw 3.2 Orinda earthquake exhibits a complex rupture process involving two subevents with northwest and up-dip directivity. The two subevents release 43 and 18 % of the total seismic moment (6.7 × 1013 N m), and their inferred peak stress drops are 18 and 8 MPa. The 2011 Mw 4.0 Berkeley and 2012 Mw 4.0 El Cerrito earthquakes are marked by high stress drop. The inferred peak and mean stress drops are about 100–130 and 40 MPa, respectively, which suggests that there are locally high levels of fault strength on the Hayward fault. Our finite-source modeling suggests that the radiation efficiency determined for these two earthquakes is very low (<0.1) and implies that most energy is dissipated during the earthquake rupture process. © 2015, The Author(s). URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84940954421&doi=10.1007%2fs00531-015-1217-8&partnerID=40&md5=1c0ee2151588f94ba81e40d694983954
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/70273
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: Berkeley Seismological Laboratory, University of California, Berkeley, CA, United States
Recommended Citation:
Taira T.,Dreger D.S.,Nadeau R.M.. Rupture process for micro-earthquakes inferred from borehole seismic recordings[J]. International Journal of Earth Sciences,2015-01-01,104(6)