DOI: 10.1002/2013GL058682
论文题名: Seismic velocity changes in the epicentral region of the 2008 Wenchuan earthquake measured from three-component ambient noise correlation techniques
作者: Liu Z. ; Huang J. ; Peng Z. ; Su J.
刊名: Geophysical Research Letters
ISSN: 0094-10522
EISSN: 1944-10253
出版年: 2014
卷: 41, 期: 1 起始页码: 37
结束页码: 42
语种: 英语
英文关键词: ambient noise correlation
; seismic velocity change
; Wenchuan earthquake
; Zipingpu Reservoir
Scopus关键词: 2008 wenchuan earthquakes
; Ambient noise
; Cross correlation techniques
; Empirical green's functions
; Negative correlation
; Permanent deformations
; Seismic velocities
; Wenchuan Earthquake
; Acoustic noise
; Correlation methods
; Seismic waves
; Velocity
; Water levels
; Earthquakes
; ambient noise
; correlation
; coseismic process
; deformation
; earthquake epicenter
; empirical analysis
; seismic velocity
; water level
; waveform analysis
; China
; Sichuan
; Wenchuan
英文摘要: We investigate temporal changes of seismic velocity in the epicentral region of the 12 May 2008 Mw 7.9 Wenchuan earthquake using three-component continuous waveforms recorded by a seven-station small-aperture array. We use an ambient noise cross-correlation technique to compute the empirical Green's function between station pairs from August 2004 to September 2011. Our results show no obvious precursory change immediately before the main shock, clear coseismic reduction of seismic velocity of up to 0.2%, and initial postseismic recovery followed by a long-lived velocity reduction. The coseismic and postseismic velocity changes are most prominent in the period band of 2-4 s (approximate depth of 1-4 km), and the velocity changes are smaller in other period bands. The seismic velocity in the period band of 1-2 s (i.e., top 2 km) correlates well with the water level change of the Zipingpu Reservoir. The observed temporal changes likely reflect damage and healing processes with possible permanent deformation in the upper crust associated with the Wenchuan main shock. Key Points Clear coseismic velocity reduction during the Wenchuan main shock Initial postseismic recovery followed by a long-lived velocity reduction Negative correlation between velocity change and the Zipingpu water level ©2013. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84896702560&doi=10.1002%2f2013GL058682&partnerID=40&md5=1b947e357ec7f5a2408eee5e6e740972
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/7786
Appears in Collections: 气候减缓与适应
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作者单位: School of Earth and Space Sciences, University of Science and Technology of China, Hefei, China
Recommended Citation:
Liu Z.,Huang J.,Peng Z.,et al. Seismic velocity changes in the epicentral region of the 2008 Wenchuan earthquake measured from three-component ambient noise correlation techniques[J]. Geophysical Research Letters,2014-01-01,41(1).