DOI: 10.1002/2015GL066603
论文题名: Elevated shear strength of sediments on active margins: Evidence for seismic strengthening
作者: Sawyer D.E. ; Devore J.R.
刊名: Geophysical Research Letters
ISSN: 0094-8337
EISSN: 1944-8068
出版年: 2015
卷: 42, 期: 23 起始页码: 10216
结束页码: 10221
语种: 英语
英文关键词: mass transport deposits
; seismic strengthening
; shear strength
; slope stability
; submarine landslides
Scopus关键词: Earthquakes
; Geophysics
; Landslides
; Lithology
; Seismology
; Shear strength
; Slope protection
; Submarine geology
; Submarines
; Surveys
; Underwater acoustics
; Active margins
; Low-frequency
; Mass transport deposit
; Seismic strengthening
; Shear-induced
; Stress state
; Submarine landslides
; Undrained shear strength
; Slope stability
英文摘要: Earthquakes are a primary trigger of submarine landslides, yet some of the most seismically active areas on Earth show a surprisingly low frequency of submarine landslides. Here we show that within the uppermost 100 m below seafloor (mbsf) in previously unfailed sediment, active margins have elevated shear strength by a factor of 2-3 relative to the same interval on passive margins. The elevated shear strength is seen in a global survey of undrained shear strength with depth as well as a normalized analysis that accounts for lithology and stress state. The enhanced shear strength is highest within the uppermost 10 mbsf. These results indicate that large areas of modern day slopes on active margins have enhanced slope stability, which may explain the relative paucity of landslides. These findings lend support to the seismic strengthening hypothesis that the repeated exposure to earthquake energy gradually increases shear strength by shear-induced compaction. © 2015. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84953432532&doi=10.1002%2f2015GL066603&partnerID=40&md5=af3adb9343b8e72c657116521716d417
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/7953
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: School of Earth Sciences, Ohio State University, Columbus, OH, United States
Recommended Citation:
Sawyer D.E.,Devore J.R.. Elevated shear strength of sediments on active margins: Evidence for seismic strengthening[J]. Geophysical Research Letters,2015-01-01,42(23).