SGER: Coseismic Uplift and Submergence in Aceh, Sumatra

SGER：苏门答腊岛亚齐的同震隆起和淹没

• 批准号: 0530899
• 负责人: Kerry Sieh
• 金额: $ 5万
• 依托单位: California Institute of Technology
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2005
• 资助国家: 美国
• 起止时间: 2005-05-01 至 2006-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0530899&HistoricalAwards=false
• 关键词: SGER; Coseismic; Uplift; Submergence; Aceh

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.

该项目的目的是完成亚齐-安达曼大地震南端附近地区的出水和淹没测绘。这项工作必须尽快完成，以尽量减少同震和震后信号的合并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，最北端的苏门答腊岛（Simeulue）隆起约 1.5 米，并向东倾斜明显。初步模拟表明，这与底层巨型逆冲断层上数米的滑移一致，深度可达数十公里。该岛周围和亚齐大陆沿线有丰富的珊瑚微环礁，为精确测量与地震破裂相关的隆起和淹没提供了机会，从而限制了亚齐-安达曼破裂南部 200 公里的性质。 PI 将利用全站仪详细绘制亚齐苏门答腊大陆海岸沿线的淹没情况，以及锡默卢周围的隆起和淹没情况。隆起可以很容易地测量为新旧最高活珊瑚水平之间的海拔差异。还可以通过确定测量时最高活珊瑚相对于海平面的海拔高度，然后使用潮汐模型确定海平面与每年最低低潮的关系来测量淹没程度。这项工作的更广泛影响包括通过博客、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、科学界以及公众传播信息。