SGER: Coseismic/Postseismic GPS Field Surveys in Response to the 26 December 2004 Mw 9.0 Sumatra Earthquake

SGER：响应 2004 年 12 月 26 日苏门答腊岛 Mw 9.0 地震的同震/震后 GPS 现场调查

• 批准号: 0517734
• 负责人: Yehuda Bock
• 金额: $ 3.5万
• 依托单位: University of California-San Diego Scripps Inst of Oceanography
• 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: 2005-04-01 至 2006-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0517734&HistoricalAwards=false
• 关键词: SGER; Coseismic; Postseismic; GPS; Field

We propose to resurvey a network of (~50) geodetic monuments in North Sumatra, the Mentawai Islands, and Banda Aceh to determine coseismic and postseismic deformation caused by the 26 December 2004 Mw=9.0 Sumatra earthquake. These new data would provide critical geodetic constraints for the seismographic inversion of the earthquake source, to constrain models of the subsequent devastating tsunamis, and to contribute to the study of the great earthquake cycle in that region. It is very important to resurvey these monuments, since these are the closest available to the earthquake's epicenter (the closest one is 150 km to the south). The last great earthquakes (Mw 8) to occur in this region were in 1833 and 1861. The geodetic monuments have been surveyed in the period 1989-2001 by Scripps Institution of Oceanography (Y. Bock, PI), Rensselaer Polytechnic Institute (R. McCaffrey PI), and the Indonesian National Coordination Agency for Surveying and Mapping (BAKOSURTANAL) with NSF and NASA funding. Over 70 stations were surveyed on Sumatra and the Mentawai islands and provide dense coverage of the Sumatra (oblique) subduction zone and the Sumatra fault, and several transects were surveyed across the Sumatra fault, including one in Banda Aceh, the region most affected by the recent disaster. We will focus on 26 stations observed on the Mentawai Islands and the Sumatran coast in 2001, and several stations just south of the epicenter on the Mentawai islands, as well as the fault transect in Banda Aceh. This effort, to commence on 7 January, 2005 by BAKOSURTANAL survey crews, will assess the condition of the geodetic monuments, perform and analyze the first survey, and set the stage for further postseismic measurements.Relevant references for previous NSF-funded research in Sumatra:Prawirodirdjo, L., Y. Bock, R. McCaffrey, J. Genrich, E. Calais, C. Stevens, S. S. O. Puntodewo, C. Subarya, J. Rais, P. Zwick, and Fauzi, "Geodetic observations of interseismic strain segmentation at the Sumatra subduction zone," Geophysical Research Letters, 24, 1997 (pp. 2601-2604).McCaffrey, R., P. Zwick, Y. Bock, L. Prawirodirdjo, J. Genrich, C. W. Stevens, S. S. O. Puntodewo, and C. Subarya, "Strain partitioning during oblique plate convergence in northern Sumatra: Geodetic and seismologic constraints and numerical modeling," Journal of Geophysical Research, 105, 2000 (pp. 28,363-28,376).Prawirodirdjo, L., Y, Bock, J. F. Genrich, S. S. O. Puntodewo, J. Rais, C. Subarya, and S. Sutisna, "One century of tectonic deformation along the Sumatran fault from triangulation and Global Positioning System surveys, " Journal of Geophysical Research, 105, 2000 (pp. 28,343-28,361).Genrich, J.F., Y. Bock, R. McCaffrey, L. Prawirodirdjo, C. W. Stevens, S. S. O. Puntodewo, and C. Subarya, "Distribution of slip at the northern Sumatran fault system," Journal of Geophysical Research, 105, 2000 (pp. 28,327-28,341).Bock, Y., L. Prawirodirdjo, J. F. Genrich, C. W. Stevens, R. McCaffrey, C. Subarya, S. S. O. Puntodewo, and E. Calais, Crustal Motion in Indonesia from Global Positioning System Measurements, J. Geophys. Res., 108(B8), 2367, doi:10.129/2001JB000324, 2003.

我们建议在北苏门答腊、明打威群岛和班达亚齐重新调查一个（~50个）大地测量纪念碑网络，以确定2004年12月26日苏门答腊Mw=9.0地震引起的同震和震后变形。这些新数据将为地震学反演地震源提供关键的大地测量限制，限制随后毁灭性海啸的模型，并有助于研究该地区的大地震周期。重新调查这些古迹非常重要，因为它们是离震中最近的（最近的一个在南部150公里处）。最近一次发生在该地区的大地震（8级）发生在1833年和1861年。1989-2001年，斯克里普斯海洋研究所（Y。博克，PI），伦斯勒理工学院（R。McCaffrey PI）和印度尼西亚国家测绘协调机构（BAKOSURTANAL），由NSF和NASA资助。对苏门答腊和明打威群岛上的70多个台站进行了调查，提供了苏门答腊（斜向）俯冲带和苏门答腊断层的密集覆盖面，并对横跨苏门答腊断层的几个断面进行了调查，包括受最近灾害影响最严重的班达亚齐的一个断面。我们将重点关注2001年在明打威群岛和苏门答腊海岸观测到的26个观测站，明打威群岛震中以南的几个观测站，以及班达亚齐的断层带。BAKOSURTANAL调查小组将于2005年1月7日开始这项工作，评估大地测量纪念碑的状况，执行和分析第一次调查，并为进一步的震后测量奠定基础。Y.博克河，巴西-地麦卡弗里，J. Genrich，E.加莱角史蒂文斯，S。S. O.蓬托代沃角Subarya，J. Rais，P. Zwick，and Fauzi，“Geodetic observations of interseismic strain segmentation at the Sumatra subduction zone，”Geophysical Research Letters，24，1997（pp. 2601-2604）.McCaffrey，R.，P. Zwick，Y.博克湖作者声明：C. W.史蒂文斯，S。S. O. Puntodewo和C. Subarya，“在北方苏门答腊斜向板块会聚期间的应变分配：大地测量和地震学约束及数值模拟”，地球物理研究杂志，105，2000（pp. Prawirodirdjo，L.，Y，Bock，J. F. Genrich，S. S. O. Puntodewo，J. Rais，C. Subarya和S. Sutisna，“从三角测量和全球定位系统调查看沿着Summartan断层的一个世纪的构造变形”，地球物理研究杂志，105，2000（pp. Genrich，J.F.，Y.博克河，巴西-地麦卡弗里湖普拉维罗迪乔角W.史蒂文斯，S。S. O. Puntodewo和C. Subarya，“分布的滑动在北方苏门答腊断层系统，”地球物理研究杂志，105，2000（pp. 28，327 - 28，341）。L. Prawirodirdjo，J. F.根里希角W.史蒂文斯河麦卡弗里角Subarya，S. S. O. Puntodewo和E.加莱，全球定位系统测量的印度尼西亚地壳运动，地球物理学杂志。结果：108（B8），2367，doi：10.129/2001JB000324，2003。