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情况的测绘。这项工作必须尽快完成，以最大限度地减少同震和震后信号的融合以及自然侵蚀和埋藏过程造成的数据退化。在亚齐-安达曼大地震期间，最北端的苏门答腊岛(Simeulue)经历了约1.5米的隆起，并明显向东倾斜。初步模拟表明，这与下伏的巨型逆冲带上的许多米的滑动是一致的，深度达到几十公里。该岛周围和亚齐大陆沿线有丰富的珊瑚微环礁，使人们有机会准确测量与地震破裂有关的隆起和淹没，从而限制亚齐-安达曼断裂南部200公里的性质。PI将与全站仪一起详细绘制亚齐苏门答腊岛大陆海岸的潜水情况，并绘制Simeulue周围的隆起和潜水情况。抬升可以很容易地测量为新旧最高水平的活珊瑚之间的高程差。还可以通过确定测量时最高活珊瑚相对于海平面的高度，然后使用潮汐模型来确定该海平面与年最低低潮之间的关系，来测量淹没程度。这项工作的更广泛影响包括通过网络博客、科学出版物、海报以及电视和广播向美国和印度尼西亚的学生、科学界和普通公众传播信息。

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.