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.

我们建议在苏门答腊北部，Mentawai群岛和Banda Aceh的网络重新研究（〜50）个地球纪念碑，以确定由2004年12月26日MW = 9.0 MW = 9.0苏门答腊地震引起的coseismisic和seist震后变形。这些新数据将为地震来源的地震颠倒，限制随后毁灭性海啸的模型，并为研究该地区的大地震周期的研究做出贡献。重塑这些纪念碑非常重要，因为这些古迹是与地震的震中最接近的（最接近地震的震中，距南部150公里）。该地区发生的最后一次大地震（MW 8）是在1833年和1861年。资金。对苏门答腊和曼特瓦伊群岛进行了调查的70多个站点，并提供了苏门答腊（斜）俯冲带和苏门答腊断层的密集覆盖范围，并在苏门答腊的断层中进行了几个横断面的调查，其中包括在班达·阿塞（Banda Aceh），该地区受到最近灾难影响的地区。我们将专注于2001年在Mentawai群岛和苏门答腊海岸上观察到的26个站点，以及Mentawai群岛上震中以南的几个站，以及Banda Aceh的断层样品。这项努力是由巴科苏尔塔纳尔调查人员于2005年1月7日开始的，将评估地球纪念碑的状况，执行和分析第一次调查，并为进一步的后地震测量奠定了基础。 O. Puntodewo，C。Subarya，J。Rais，P。Zwick和Fauzi，“苏门答腊俯冲区的经济震动应变分割的大地观察”，《地球物理研究快报》，24，1997，1997年（第2601-2604页）（第2601-2604页）。 Stevens，S。S. O. Puntodewo和C. subarya，“苏门答腊北部斜板收敛期间的应变分区：地球物理学和数值建模”，《地球物理学研究杂志》，第105期，2000年，2000年（第28,363-28,376页）。 Puntodewo，J。Rais，C。Subarya和S. Sutisna，“三角剖分和全球定位系统调查沿苏门答腊断层的构造变形的一个世纪”，《地球物理研究杂志》，第105页，2000年（2000年）（第28,343-28-28-28,361页。史蒂文斯（S. S. E. Calais，《全球定位系统测量》中印度尼西亚的地壳运动，J。Geophys。 Res。，108（b8），2367，doi：10.129/2001jb000324，2003。