globalchange  > 科学计划与规划
DOI: 10.1002/2015GL066083
论文题名:
Unusually large tsunamis frequent a currently creeping part of the Aleutian megathrust
作者: Witter R.C.; Carver G.A.; Briggs R.W.; Gelfenbaum G.; Koehler R.D.; La Selle S.; Bender A.M.; Engelhart S.E.; Hemphill-Haley E.; Hill T.D.
刊名: Geophysical Research Letters
ISSN: 0094-9535
EISSN: 1944-9266
出版年: 2016
卷: 43, 期:1
起始页码: 76
结束页码: 84
语种: 英语
英文关键词: Aleutian Subduction Zone ; creep ; tsunami deposits ; tsunamis
Scopus关键词: Creep ; Sea level ; 1957 Aleutian tsunamis ; Current models ; Earthquake and tsunamis ; Geodetic measurements ; Marine diatoms ; Mean sea level ; Subduction zones ; Tsunami deposits ; Tsunamis ; Nitzschia alba
英文摘要: Current models used to assess earthquake and tsunami hazards are inadequate where creep dominates a subduction megathrust. Here we report geological evidence for large tsunamis, occurring on average every 300-340 years, near the source areas of the 1946 and 1957 Aleutian tsunamis. These areas bookend a postulated seismic gap over 200 km long where modern geodetic measurements indicate that the megathrust is currently creeping. At Sedanka Island, evidence for large tsunamis includes six sand sheets that blanket a lowland facing the Pacific Ocean, rise to 15 m above mean sea level, contain marine diatoms, cap terraces, adjoin evidence for scour, and date from the past 1700 years. The youngest sheet and modern drift logs found as far as 800 m inland and >18 m elevation likely record the 1957 tsunami. Previously unrecognized tsunami sources coexist with a presently creeping megathrust along this part of the Aleutian Subduction Zone. © 2015. American Geophysical Union. All Rights Reserved.
URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84956586565&doi=10.1002%2f2015GL066083&partnerID=40&md5=9eb5734c80cecf6263bb7d36d4332e28
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/10498
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: U.S. Geological Survey, Anchorage, AK, United States

Recommended Citation:
Witter R.C.,Carver G.A.,Briggs R.W.,et al. Unusually large tsunamis frequent a currently creeping part of the Aleutian megathrust[J]. Geophysical Research Letters,2016-01-01,43(1).
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