Collaborative Research: Analysis of Seismicity Associated with the Mw=8.8 2010 Maule Earthquake and Implications for Subduction Processes

2010年2月27日，智利近海发生的Mw=8.8级地震是有记录以来第5次最大的大地震，也是现代数字地震台网记录到的第二大地震。Maule地震发生后，来自德国、法国、英国和美国的地震学家团队与智利的地震学家合作，协调资源，在断裂带上方部署宽带和短周期地震仪和加速计，以捕捉与这场重大地震相关的余震。从这些台站记录的数据将被合并，以产生一个开放的国际社会数据量，提供一个前所未有的机会来调查与大地震有关的过程，并成像俯冲带的解剖结构。毛勒余震调查的一个重要特点是在国家和国际两级的合作。美国团队最初参与的数据收集是从IRIS社区自愿发展出来的，通过合作提高效率的理念很容易被在该地区工作的五个国际组织采用。在这个项目中，研究人员将对Maule国际地震数据集进行广泛但相互关联的地震分析，以及对地震前在破裂带收集的数据进行重新分析，以解决最初收集数据的一些基本科学目标。这些目标大致分为两类：(1)大型逆冲断裂的破裂过程；(2)大洋-大陆(安第斯)边缘的活动构造和动力学。他们打算通过一系列分析技术产生一套内部一致的数据产品。PI将共享研究生，并安排对彼此实验室的长期访问，从而使学生接触到比大多数学生通常所享有的更广泛的体验。最后，他们计划通过分享一些共同感兴趣的分析任务来吸引我们的国际同事。这项研究产生的数据产品将通过专门的网站向更广泛的国际社会提供。

The Mw=8.8 Maule earthquake off the coast of Chile onFebruary 27, 2010 is the 5th largest megathrust earthquake ever to be recorded and the 2ndlargest to be recorded by modern digital seismic networks. Immediately following theMaule earthquake, teams of seismologists from Germany, France, the UK, and the US,working with seismologists in Chile, coordinated resources to deploy both broadband andshort period seismometers and accelerometers above the rupture zone to captureaftershocks associated with this significant earthquake. Data recorded from these stationswill be combined to produce an open international community data volume providing anunprecedented opportunity to investigate processes associated with great earthquakes andto image the anatomy of a subduction zone. A defining characteristic of the Maule aftershock investigationshas been collaboration, at both national and international levels. The original involvementin the data collection by US teams grew voluntarily out of the IRIS community, and therationale of greater efficiencies through cooperation was readily adapted by the fiveinternational groups working in the region.In this project the researchers will carry out a broad butinterrelated spectrum of seismic analyses to the Maule international seismic data set,along with a reanalysis of a selection of data collected in the rupture zone prior to theearthquake, to address some of the fundamental scientific objectives that motivated theinitial data collection. These objectives fall into two general categories: (1) ruptureprocesses of megathrusts, and (2) active tectonics and dynamics of an oceanic-continental(Andean) margin. They intend to produce an internally consistent set of data products across a range ofanalytical techniques. The PIs will share graduate students and scheduling extended visits to each others labs, thereby exposing students to a significantly broader range of experience than most students typically enjoy. Finally, they plan to engage our international colleagues by sharing some analysis tasks of mutualinterest. Data products generated by this study will be made available to the broaderinternational community via a dedicated web site.