RAPID: Deep seismic investigation of Sumatran subduction zone seismic gap

该奖项是根据2009年《美国复苏和再投资法案》(公法111-5)提供资金的。这是一个快速项目，派遣一名职业早期的女研究人员参与苏门答腊岛俯冲带明打威段中央部分独特的、最先进的三维地震研究，以收集和解释苏门答腊岛俯冲板块深达数十公里的详细地球物理数据。将测量三个断面，每条断面长约350-400公里。这项为期21天的调查将在一艘具有出色采集能力的工业船舶上进行，其中包括一条超长的拖缆(15公里)，这是有史以来使用的最长的拖缆，并将对苏门答腊岛边缘的结构提供新的限制，包括从海沟最浅的表达到锁定区域的下倾极限的巨型逆冲断层平面的成像。数据还将被用来拍摄该地区其他活跃的、可能容易发生海啸的断层的图像。产生的数据将被用来检查过去和未来地震的破裂面和其他深层界面，使用一种新技术，利用在大震源-接收器距离记录的波场。目标是将构造信息与明打威群岛构造垂直运动的研究联系起来，以便在我们对俯冲带过程的理解上取得突破。这项工作的更广泛影响包括阐明苏门答腊岛地区的地震和地震引发的海啸危害，该地区人口稠密的沿海城市。

This award is funded under the American Recovery and Reinvestment Act of 2009 (Public Law 111-5). This is a RAPID project that sends an early career female researcher to participate in a unique, state-of-the-art, 3D seismic study of the central portion of the Mentawai segment of the Sumatran subduction zone to collect and interpret detailed geophysical data of the Sumatran subducting slab down to a depth of several tens of kilometers. Three transects each ~350-400km in length will be surveyed. The 21 day survey will be carried out on an industry vessel with outstanding acquisition capabilities, including an ultra-long streamer (15km), the longest ever used, and will provide new constraints on the structure of the Sumatran margin, including imaging of the megathrust fault plane from its shallowest expression at the trench to the downdip limit of the locked zone. Data will also be used to image other active and possibly tsunami prone faults in the area. Resulting data will be used to examine the rupture surface of past and future earthquakes and other deep interfaces using a novel technique exploiting the wavefield recorded at large source-receiver distances. Goals are to link structural information with studies of tectonic vertical movements on the Mentawai Islands to yield a breakthrough in our understanding of subduction zone processes. Broader impacts of the work include elucidation of earthquake and seismogenically-gernearted tsunami hazards in the Sumatran area which has highly populated coastal cities.