DOI: 10.1002/2013GL057700
论文题名: Seismic slip deficit in the Kashmir Himalaya from GPS observations
作者: Schiffman C. ; Bali B.S. ; Szeliga W. ; Bilham R.
刊名: Geophysical Research Letters
ISSN: 0094-8421
EISSN: 1944-8152
出版年: 2013
卷: 40, 期: 21 起始页码: 5642
结束页码: 5645
语种: 英语
英文关键词: GPS measurements
; Kashmir seismic hazard
; slip deficit
Scopus关键词: Convergence rates
; GPS measurements
; Historical earthquakes
; Kashmir earthquake
; Seismic hazards
; slip deficit
; Theoretical moments
; Transition zones
; Faulting
; Earthquakes
; convergence
; earthquake epicenter
; GPS
; measurement method
; quantitative analysis
; slip
; transition zone
; Himalayas
; India
; Jammu and Kashmir
; Kashmir Valley
英文摘要: GPS measurements in Kashmir Himalaya reveal range-normal convergence of 11 ± 1 mm/yr with dextral shear of 5 ± 1 mm/yr. The transition from a fully locked 170 km wide décollement to the unrestrained descending Indian plate occurs at ~25 km depth over an ~23 km wide transition zone. The convergence rate is consistent with the lower bounds of geological estimates for the Main Frontal Thrust, Riasi, and Balapora fault systems, on which no surface slip has been reported in the past millennium. Of the 14 damaging Kashmir earthquakes since 1123, none may have exceeded Mw = 7.6. Therefore, either a seismic moment deficit equivalent to a Mw ≈ 8.7 earthquake exists or the historical earthquake magnitudes have been underestimated. Alternatively, these earthquakes have occurred on reverse faults in the Kashmir Valley, and the décollement has been recently inactive. Although this can reconcile the inferred and theoretical moment release, it is quantitatively inconsistent with observed fault slip in Kashmir. Key Points Oblique tectonic convergence occurs in Kashmir at 12.5 mm/yr. The width of the décollement exceeds 150 km, wider than elsewhere in the Himalaya. The current slip deficit anticipates a Mw 7.3-8.6 earthquake, with important caveats. Since 1555, earthquakes have damaged Indian Kashmir every 29±27 years. ©2013. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84887287502&doi=10.1002%2f2013GL057700&partnerID=40&md5=371230688d48881227b9e24f6a34ea72
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/5685
Appears in Collections: 气候减缓与适应
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作者单位: CIRES, Department of Geological Sciences, University of Colorado, Boulder, CO 80309-0399, United States
Recommended Citation:
Schiffman C.,Bali B.S.,Szeliga W.,et al. Seismic slip deficit in the Kashmir Himalaya from GPS observations[J]. Geophysical Research Letters,2013-01-01,40(21).