Postseismic investigation of the February 2010 Chile earthquake: Relaxation processes and the relationship of seismic and aseismic activity.

2010 年 2 月智利地震的震后调查：弛豫过程以及地震与地震活动的关系。

• 批准号: NE/I005420/1
• 负责人: Andreas Rietbrock
• 金额: $ 10.57万
• 依托单位: University of Liverpool
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2010
• 资助国家: 英国
• 起止时间: 2010 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=NE%2FI005420%2F1
• 关键词: Postseismic; investigation; February; 2010; Chile

The magnitude 8.8 earthquake off the coast of Chile on 27 February 2010 is the fifth largest megathrust earthquake ever to be recorded and provides unprecedented opportunities to further our understanding of megathrust earthquakes and associated processes. We propose to co-locate 12 continuous GPS stations and broadband seismometers to measure postseismic activity following the 27 February 2010 Chile earthquake, in order to evaluate (1) the relative contributions of localised afterslip and mantle flow to postseismic stress relaxation, (2) whether there is any temporal/spatial interrelationship of seismic and aseismic activity on the plate interface, and (3) whether seismic properties in the subducting slab or overriding plate have changed or are changing on account of the rupture. Very few studies of postseismic deformation for large subduction zone earthquakes exist, and this event affords an excellent opportunity to investigate the time-dependent state of stress on and near the plate interface and the associated effects on the seismic properties. Our study complements a multinational effort (Chile, US, France, Germany, UK) in data collection and research into the source processes of such a large subduction thrust earthquake. The results of this study are likely to inform earthquake hazard assessment in this and other areas of the world.

2010 年 2 月 27 日智利海岸发生的 8.8 级地震是有记录以来第五次最大的逆冲地震，为进一步了解逆冲地震及相关过程提供了前所未有的机会。我们建议将 12 个连续 GPS 站和宽带地震仪放在一起来测量 2010 年 2 月 27 日智利地震后的震后活动，以评估 (1) 局部余滑和地幔流对震后应力松弛的相对贡献，(2) 是否板块界面上的地震和地震活动是否存在时间/空间相互关系，以及 (3) 俯冲板块或上覆板块的地震特性是否发生了变化或因破裂而发生变化。关于大型俯冲带地震的震后变形的研究很少，而这一事件提供了一个极好的机会来研究板块界面上和附近的应力随时间变化的状态以及对地震特性的相关影响。我们的研究补充了多国（智利、美国、法国、德国、英国）在数据收集和研究此类大型俯冲逆冲地震震源过程方面的努力。这项研究的结果可能会为该地区和世界其他地区的地震灾害评估提供信息。

项目成果

Order of magnitude increase in subducted H2O due to hydrated normal faults within the Wadati-Benioff zone

• DOI: 10.1130/g34730.1
• 发表时间: 2014-03
• 期刊: Geology
• 影响因子: 5.8
• 作者: T. Garth;A. Rietbrock

The DATA Bonanza - Improving Knowledge Discovery in Science, Engineering, and Business

数据富矿 - 改善科学、工程和商业领域的知识发现

• DOI: 10.1002/9781118540343.ch19
• 发表时间: 2013
• 作者: Blower J

The Effect of Varying Damage History in Crystalline Rocks on the P- and S-Wave Velocity under Hydrostatic Confining Pressure

• DOI: 10.1007/s00024-012-0550-0
• 发表时间: 2013-04
• 期刊: Pure and Applied Geophysics
• 影响因子: 2
• 作者: O. Blake;D. Faulkner;A. Rietbrock

Seismic anisotropy in the Sumatra subduction zone

• DOI: 10.1002/jgrb.50157
• 发表时间: 2013-10-01
• 期刊: JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
• 影响因子: 3.9
• 作者: Collings, R.;Rietbrock, A.;Natawidjaja, D.
• 通讯作者: Natawidjaja, D.

Downdip velocity changes in subducted oceanic crust beneath Northern Japan-insights from guided waves

日本北部俯冲洋壳的下倾速度变化——来自导波的见解

• DOI: 10.1093/gji/ggu206
• 发表时间: 2014
• 期刊: Geophysical Journal International
• 影响因子: 2.8
• 作者: Garth T