Collaborative Research: Post-seismic response updip of the Chilean megathrust earthquake of February 27, 2010

合作研究：2010 年 2 月 27 日智利巨型逆冲地震的震后响应上升

• 批准号: 1130013
• 负责人: Anne Tréhu
• 金额: $ 31.27万
• 依托单位: Oregon State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2011
• 资助国家: 美国
• 起止时间: 2011-11-15 至 2016-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1130013&HistoricalAwards=false
• 关键词: Collaborative; Research; Post; seismic; response

Among the hazards that arise from large earthquakes are the direct effects of great earthquakes, as evidenced by last year?s devastating earthquake off Japan, and local and distant effects of tsunamis. Though they pose enormous risks to life and property in highly populated areas, neither of these phenomena is as yet well understood. The recent great earthquake in Chile did not generate a large tsunami, probably because the rupture produce a surface break at the seafloor. Available evidence suggests that slip did not occur at depths shallower than about 30 km down-dip from the trench. Accordingly, the proponents of this project infer that the outer accretionary wedge that lies along the Chile coast above the rupture zone behaves as a poro-elastic medium that will adjust over time to the new stress regime caused by the earthquake. The aim of the proposal is to observe the effects of this transient adjustment, by deploying a focused array of ocean bottom seismographs equipped with flow meters. The principal broader impact of this effort is considerably improved understanding of megathrust earthquakes and tsunamis.

大地震发生的危害是大地震的直接影响，这证明了去年毁灭日本危及的地震，以及海啸的局部和遥远影响。尽管它们在人口稠密的地区构成了巨大的生命和财产风险，但这些现象都没有得到充分理解。最近在智利的大地震没有产生大海啸，这可能是因为破裂在海底产生了地面破裂。可用的证据表明，在距离沟渠倾斜约30 km的深度时，滑移不会发生。因此，该项目的支持者推断出，沿着破裂区域上方的智利海岸的外积楔形表现为一种孔隙弹性培养基，随着时间的推移会随着时间的推移调整为由地震引起的新的应力状态。该提案的目的是通过部署装有流量计的一系列集中的海洋底部地震仪来观察这种瞬态调整的影响。这项努力的主要广泛影响是对大型地震和海啸的理解大大提高了。