DOI: 10.1002/2016GL070704
论文题名: Evidence for shallow megathrust slip across the Unalaska seismic gap during the great 1957 Andreanof Islands earthquake, eastern Aleutian Islands, Alaska
作者: Nicolsky D.J. ; Freymueller J.T. ; Witter R.C. ; Suleimani E.N. ; Koehler R.D.
刊名: Geophysical Research Letters
ISSN: 0094-8537
EISSN: 1944-8268
出版年: 2016
卷: 43, 期: 19 起始页码: 10328
结束页码: 10337
语种: 英语
英文关键词: 1957 earthquake
; coseismic slip
; tsunami
Scopus关键词: Deformation
; Geophysics
; Seismology
; Tide gages
; Tsunamis
; Aftershock zones
; Aleutian islands
; Coseismic slips
; Deformation models
; Seafloor deformation
; Slip distribution
; Tide gauge data
; Tsunami simulation
; Earthquakes
英文摘要: We reassess the slip distribution of the 1957 Andreanof Islands earthquake in the eastern part of the aftershock zone where published slip models infer little or no slip. Eyewitness reports, tide gauge data, and geological evidence for 9–23 m tsunami runups imply seafloor deformation offshore Unalaska Island in 1957, in contrast with previous studies that labeled the area a seismic gap. Here we simulate tsunami dynamics for a suite of deformation models that vary in depth and amount of megathrust slip. Tsunami simulations show that a shallow (5–15 km deep) rupture with ~20 m of slip most closely reproduces the 1957 Dutch Harbor marigram and nearby >18 m runup at Sedanka Island marked by stranded drift logs. Slip models >20 km deep predict waves that arrive too soon. Our results imply that shallow slip on the megathrust in 1957 extended east into an area that presently creeps. ©2016. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84990946789&doi=10.1002%2f2016GL070704&partnerID=40&md5=7e890cbc919a10b2425fdcf6fb7da772
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/9500
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: Geophysical Institute, University of Alaska Fairbanks, Fairbanks, AK, United States
Recommended Citation:
Nicolsky D.J.,Freymueller J.T.,Witter R.C.,et al. Evidence for shallow megathrust slip across the Unalaska seismic gap during the great 1957 Andreanof Islands earthquake, eastern Aleutian Islands, Alaska[J]. Geophysical Research Letters,2016-01-01,43(19).