DOI: 10.1002/2015GL064587
论文题名: Detailed rupture imaging of the 25 April 2015 Nepal earthquake using teleseismic P waves
作者: Fan W. ; Shearer P.M.
刊名: Geophysical Research Letters
ISSN: 0094-9144
EISSN: 1944-8875
出版年: 2015
卷: 42, 期: 14 起始页码: 5744
结束页码: 5752
语种: 英语
英文关键词: backprojection
; earthquake
; seismology
Scopus关键词: Earthquake effects
; Geophysics
; Seismic waves
; Seismology
; Aftershock distributions
; Back-projection
; Centroid moment tensors
; High frequency HF
; Low frequency images
; Radiated energies
; Similar analysis
; Spatial resolution
; Earthquakes
; aftershock
; asperity
; earthquake event
; image analysis
; P-wave
; rupture
; seismology
; teleseismic wave
; Bagmati
; Kathmandu
; Nepal
英文摘要: We analyze the rupture process of the 25 April 2015 Nepal earthquake with globally recorded teleseismic P waves. The rupture propagated east-southeast from the hypocenter for about 160 km with a duration of ∼55 s. Backprojection of both high-frequency (HF, 0.2 to 3 Hz) and low-frequency (LF, 0.05 to 0.2 Hz) P waves suggest a multistage rupture process. From the low-frequency images, we resolve an initial slow downdip (northward) rupture near the nucleation area for the first 20 s (Stage 1), followed by two faster updip ruptures (20 to 40 s for Stage 2 and 40 to 55 s for Stage 3), which released most of the radiated energy northeast of Kathmandu. The centroid rupture power from LF backprojection agrees well with the Global Centroid Moment Tensor solution. The spatial resolution of the backprojection images is validated by applying similar analysis to nearby aftershocks. The overall rupture pattern agrees well with the aftershock distribution. A multiple-asperity model could explain the observed multistage rupture and aftershock distribution. © 2015. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84938974588&doi=10.1002%2f2015GL064587&partnerID=40&md5=b83de9ff737ccc4e33e2602fd995e65b
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/8760
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: Scripps Institution of Oceanography, University of California, San Diego, CA, United States
Recommended Citation:
Fan W.,Shearer P.M.. Detailed rupture imaging of the 25 April 2015 Nepal earthquake using teleseismic P waves[J]. Geophysical Research Letters,2015-01-01,42(14).