DOI: 10.1002/2014GL059380
论文题名: Uplift and subsidence reveal a nonpersistent megathrust rupture boundary (Sitkinak Island, Alaska)
作者: Briggs R.W. ; Engelhart S.E. ; Nelson A.R. ; Dura T. ; Kemp A.C. ; Haeussler P.J. ; Corbett D.R. ; Angster S.J. ; Bradley L.-A.
刊名: Geophysical Research Letters
ISSN: 0094-10191
EISSN: 1944-9922
出版年: 2014
卷: 41, 期: 7 起始页码: 2289
结束页码: 2296
语种: 英语
英文关键词: Alaska
; diatom
; earthquake
; megathrust
; rupture
; Sitkinak Island
Scopus关键词: Cesium
; Computerized tomography
; Earthquakes
; Lead
; Stratigraphy
; Tsunamis
; Alaska
; diatom
; Megathrust
; rupture
; Sitkinak Island
; Landforms
; cesium isotope
; coseismic process
; diatom
; earthquake event
; lagoon
; lead isotope
; microfossil
; outcrop
; radiocarbon dating
; rupture
; subsidence
; thrust
; tomography
; tsunami
; uplift
; Alaska
; Sitkinak Island
; Trinity Islands
; United States
; Bacillariophyta
英文摘要: We report stratigraphic evidence of land-level change and tsunami inundation along the Alaska-Aleutian megathrust during prehistoric and historical earthquakes west of Kodiak Island. On Sitkinak Island, cores and tidal outcrops fringing a lagoon reveal five sharp lithologic contacts that record coseismic land-level change. Radiocarbon dates, 137Cs profiles, computerized tomography scans, and microfossil assemblages are consistent with rapid uplift circa 290-0, 520-300, and 1050-790-cal-yr B.P. and subsidence in A.D. 1964 and circa 640-510-cal-yr B.P. Radiocarbon, 137Cs, and 210Pb ages bracketing a sand bed traced 1.5-km inland and evidence for sudden uplift are consistent with Russian accounts of an earthquake and tsunami in A.D. 1788 the mixed uplift and subsidence record suggests that Sitkinak Island sits above a nonpersistent boundary near the southwestern limit of the A.D. 1964 Mw 9.2 megathrust rupture. Key Points Mixed coseismic uplift and subsidence at edge of 1964 M 9.2 rupture since ~1 ka First geologic evidence of the great 1788 earthquake and tsunami Non-persistent barrier to rupture important for tectonic and hazard models © 2014. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84899034014&doi=10.1002%2f2014GL059380&partnerID=40&md5=722e4f0f35f4e3e980f75528357bc6d6
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/7455
Appears in Collections: 气候减缓与适应
There are no files associated with this item.
作者单位: Geologic Hazards Science Center, U.S. Geological Survey, Golden, CO, United States
Recommended Citation:
Briggs R.W.,Engelhart S.E.,Nelson A.R.,et al. Uplift and subsidence reveal a nonpersistent megathrust rupture boundary (Sitkinak Island, Alaska)[J]. Geophysical Research Letters,2014-01-01,41(7).