SGER: Coseismic Uplift and Submergence in Aceh, Sumatra

该项目的目的是完成亚齐-安达曼大地震南端附近地区的浮现和淹没绘图。这项工作必须尽快完成，以尽量减少同震和震后信号的混淆以及自然侵蚀和掩埋过程造成的数据退化。在亚齐-安达曼大地震期间，苏门答腊岛最北端的西梅卢岛（Simeulue）经历了约1.5米的隆起，并有明显的向东倾斜。初步的模型显示，这与下面的巨型逆冲断层上的许多米的滑动是一致的，深度为几十公里。这个岛屿周围和沿着亚齐大陆丰富的珊瑚微环礁提供了精确测量与地震破裂相关的隆起和淹没的机会，从而限制了亚齐-安达曼断裂南部200公里的性质。PI将使用全站仪详细绘制亚齐Summartan大陆沿岸的淹没情况，并绘制Simeulue周围的隆起和淹没情况。珊瑚礁的高度可以很容易地测量为新旧最高活珊瑚高度之间的高度差。也可以通过确定测量时最高活珊瑚相对于海平面的高度，然后使用潮汐模型确定该海平面与最低年低潮的关系来测量淹没。这项工作的更广泛影响包括通过博客、科学出版物、海报、电视和广播向美国和印度尼西亚的学生、科学界和公众传播信息。

The intent of this project is to complete mapping of emergence and submergence in the region near the southern end of the giant Aceh-Andaman earthquake. The work must be done as soon as possible, to minimize the conflation of coseismic and post-seismic signals and the degradation of the data by natural processes of erosion and burial. During the giant Aceh-Andaman earthquake, the northernmost Sumatran island (Simeulue) experienced an uplift of ~1.5 meters, with a pronounced eastward tilt. Preliminary modeling shows that this is consistent with many meters of slip on the underlying megathrust, to a depth of a few tens of km. The abundance of coral microatolls around this island and along the Acehnese mainland afford the opportunity to measure precisely the uplift and submergence associated with the earthquake rupture and thereby to constrain the nature of the southern 200 km of the Aceh-Andaman rupture. The PI will map in detail, with Total Station, the submergence along the mainland Sumatran coast in Aceh and to map uplift and submergence around Simeulue. Uplift can be measured easily as the elevation difference between old and new highest levels of living coral. Submergence can also be measured by determining the elevation of highest living coral relative to sea level at the time of measurement, and then using a tidal model to determine the relationship of that sea level to the lowest annual low-tide. Broader Impacts of the work include dissemination of information to students, the scientific community, and the general public both in the US and Indonesia through weblogs, scientific publications, posters and television and radio.