DOI: 10.1002/grl.50259
论文题名: Complementary slip distributions of the largest earthquakes in the 2012 Brawley swarm, Imperial Valley, California
作者: Wei S. ; Helmberger D. ; Owen S. ; Graves R.W. ; Hudnut K.W. ; Fielding E.J.
刊名: Geophysical Research Letters
ISSN: 0094-9283
EISSN: 1944-9014
出版年: 2013
卷: 40, 期: 5 起始页码: 847
结束页码: 852
语种: 英语
英文关键词: Brawley Earthquake Swarm Imperial Valley
; geothermal
; high-rate GPS
; strong motion
Scopus关键词: Earthquake swarms
; geothermal
; High rate
; High-rate GPS datum
; Rupture directivity
; Strong motion
; Velocity structure
; Waveform inversion
; Earth sciences
; Geophysics
; Earthquakes
; comparative study
; earthworks
; rupture
; slip
; waveform analysis
; California
; Imperial Valley
; United States
英文摘要: We investigate the finite rupture processes of two M > 5 earthquakes in the 2012 Brawley swarm by joint inversion of nearby strong motion and high-rate GPS data. Waveform inversions up to 3 Hz were made possible by using a small event (Mw3.9) for path calibration of the velocity structure. Our results indicate that the first (Mw5.3) event ruptured a strong, concentrated asperity with offsets of ∼20 cm centered at a depth of 5 km. The subsequent Mw5.4 event occurred 1.5 h later with a shallower slip distribution that surrounds and is complementary to that of the earlier event. The second event has a longer rise time and weaker high-frequency energy release compared to the Mw5.3 event. Both events display strong rupture directivity toward the southwest and lack of very shallow (<2 km) coseismic slip. The hypocenters for these events appear to be near or in the bedrock, but most of the slip is distributed at shallower depths (<6 km) and can explain a large part of the GPS offsets for the swarm. The complementary slip distributions of the two events suggest a triggering relationship between them with no significant creep needed to explain the various data sets. © 2013. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84876784958&doi=10.1002%2fgrl.50259&partnerID=40&md5=a211c9c00edc15492b50cb16c7f9f34f
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/6547
Appears in Collections: 气候减缓与适应
There are no files associated with this item.
作者单位: Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA 91125, United States
Recommended Citation:
Wei S.,Helmberger D.,Owen S.,et al. Complementary slip distributions of the largest earthquakes in the 2012 Brawley swarm, Imperial Valley, California[J]. Geophysical Research Letters,2013-01-01,40(5).