Collaborative Research: Deep imaging of the south-central Chile margin to understand plate boundary development and its control on megathrust slip behavior
Collaborative Research: Deep imaging of the south-central Chile margin to understand plate boundary development and its control on megathrust slip behavior
批准号:
1558867
负责人:
Anne Tréhu
金额:
$43.98万
依托单位:
依托单位国家:
美国
项目类别:
Continuing Grant
财政年份:
2016
资助国家:
美国
项目状态:
已结题
起止时间:
2016-07-01 至 2020-06-30
中文摘要
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英文摘要
As part of the "ring of fire," the western coast of South America is subject to frequent large earthquakes. This is because the oceanic plate is being thrust under (subducted) beneath the continent of South America. The high level of activity along the Chile margin makes it an excellent place to study how geologic structure can influence earthquake behavior, knowledge that can be transferred to other subduction zones around the world. The portion of the Chile margin that ruptured in 1960 seems to produce similar great earthquakes every 100 to 150 years whereas to the north the historical pattern is less regular, with several smaller earthquakes interspersed with occasional larger earthquakes. The goal of this project is to use seismic imaging tools available on the research vessel Langseth to look deep into this margin (up to ~15 km in depth) to characterize the physical properties of the boundary between the oceanic and continental plates that may control how it ruptures. The results will have broad societal impact by informing efforts to evaluate seismic hazards globally. This setting is a good analog to the Cascadia subduction zone off the westcoast of the US, and a better understanding of the Chilean megathrust should lead to more informed hazard forecasts and mitigation plans for Cascadia (and margins around the globe). The science team for the research cruise will include professors and students from the US and Chile (and possibly other countries) and provide hands-on training in seismic reflection data acquisition and processing. The research cruise will also be an opportunity to reach out both virtually (through student-led blogs) and in person (through ship tours in port) with school children and the general public. The south-central Chile subduction zone (34-47 degrees S) experienced the largest instrumentally-recorded earthquake (Mw 9.5) in 1960 and the sixth largest (Mw 8.8) in 2010 on an adjacent, overlapping segment to the north. The segment that ruptured during the 1960 event has a history of regular rupture of this entire 1000-km long segment, while the 500-km long segment that ruptured during the 2010 event usually ruptures in smaller (100 km) patches and at irregular intervals. Good slip models are available for both events as well as a model for interplate coupling leading up to the 2010 event. Because of the long earthquake history coupled with extensive modern constraints on interplate slip and interseismic coupling, this region is an excellent place to compare the along-strike differences in forearc geologic structure and determine their role in controlling these major along-strike differences in megathrust earthquake behavior. Several observations and hypotheses have been presented in recent years to explain the different slip behaviors observed in subduction zones globally. Foremost among these is the observation that the largest historic earthquakes (e.g. south-central Chile, Alaska, Sumatra and Cascadia) tend to be in thickly-sedimented subduction zones, possibly because a thick sediment cover leads to a smooth, homogeneous plate-boundary. This project will obtain seismic reflection data to image the detailed structure of the plate boundary at depth and determine how sediment on the incoming plate interacts with basement topography and whether sediment thickness controls the interaction between the upper and lower plates that leads to great earthquakes.
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批准号:1946347
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资助金额:$37.49万
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批准号:1459368
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批准号:1147975
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项目类别:Continuing Grant
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资助金额:$19.06万
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依托单位:
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批准号:1130013
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项目类别:Standard Grant
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依托单位:
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批准号:1049682
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项目类别:Standard Grant
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资助金额:$10.4万
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EarthScope Institute: The Lithosphere-Asthenosphere Boundary
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批准号:1059661
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项目类别:Standard Grant
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资助金额:$9.39万
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负责人:Anne Tréhu
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依托单位:
Workshop Support: An EarthScope Institute on the Spectrum of Fault Slip Behaviors
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批准号:1041872
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项目类别:Standard Grant
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资助金额:$4.99万
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负责人:Anne Tréhu
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依托单位:
Proposal for EarthScope Pre-meeting Workshop Support: Leveraging USArray - Opportunities for Onshore/Offshore Experiments and USArray and EarthScope Science in Alaska
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批准号:0937763
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资助金额:$2.08万
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财政年份:2009
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负责人:Anne Tréhu
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依托单位:
Evaluation of optical fiber Distributed Temperature Sensors (DTS) as a tool to constrain heat and mass transport between sediments and the overlying water column
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批准号:0734033
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项目类别:Standard Grant
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资助金额:$2.0万
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财政年份:2007
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依托单位:
Planning, Products and the Public: An EarthScope National Office at Oregon State University
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批准号:0719204
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项目类别:Continuing Grant
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资助金额:$159.51万
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财政年份:2007
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负责人:Anne Tréhu
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依托单位:
Characterizing 3D fracture networks and modeling wave propagation beneath Southern Hydrate Ridge using data from the existing 3D seismic site survey
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批准号:0646226
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项目类别:Standard Grant
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资助金额:$8.93万
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财政年份:2007
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负责人:Anne Tréhu
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依托单位:
Monitoring Sseismicity Associated With a Possible Asperity on the Cascadia Megathrust
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批准号:0550402
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项目类别:Continuing Grant
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资助金额:$0.0万
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财政年份:2006
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负责人:Anne Tréhu
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依托单位:
Imaging Fine-scale Density Structure in the Ocean with Seismic Reflection Data
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批准号:0526632
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项目类别:Standard Grant
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资助金额:$0.0万
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财政年份:2005
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负责人:Anne Tréhu
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依托单位:
Collaborative Research: Shear Wave Studies of Hydrate Ridge, Oregon Continental Margin, during Planned ODP Leg 198
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批准号:0002410
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项目类别:Standard Grant
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资助金额:$12.9万
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财政年份:2001
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负责人:Anne Tréhu
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依托单位:
3-D Seismic Imaging of an Active Margin Hydrate System - Oregon Continental Margin
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批准号:9906990
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项目类别:Standard Grant
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资助金额:$32.26万
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财政年份:2000
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负责人:Anne Tréhu
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依托单位:
Origin and Tectonic Development of the Gorda Escarpment
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批准号:9811498
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项目类别:Standard Grant
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资助金额:$15.72万
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财政年份:1999
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负责人:Anne Tréhu
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依托单位:
Collaborative Research: Lithospheric Evolution in Response to Triple-Junction Migration: Seismic Images of the Mendocino Triple Junction Region
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批准号:9527001
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项目类别:Standard Grant
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资助金额:$7.01万
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财政年份:1996
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负责人:Anne Tréhu
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依托单位:
Collaborative Research: Lithospheric Evolution in Response to Triple Junction Migration: Seismic Images of the Mendocino Triple Junction Region
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批准号:9219870
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项目类别:Continuing Grant
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资助金额:$42.71万
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财政年份:1993
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负责人:Anne Tréhu
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依托单位:
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