A Proposal for 3D Basin Structure Reconstruction in Central Taiwan and 3D Simulation of Ground Motion and Deformation Related to the 1999 Chi-Chi (Mw=7.6) Earthquake, Taiwan

摘要提案编号：0106802（PH#56x）标题：台湾中部盆地结构三维重建及1999年集集地震地震动与变形三维模拟之提案（Mw=7.6）地震，台湾PI：Chi-Yuen Wang和道格拉斯S.Dreger，加州大学，台湾岛是由菲律宾海板块和欧亚板块在~5 Ma以来斜向碰撞形成的，是世界上上升最快的山脉带之一。1999年的集集（Mw=7.6）地震，最大的袭击该岛在上个世纪，创造了前所未有的准确数据量，因此，一个分水岭的研究机会，以更好地了解地震的危害，有可能大大提高知识的状态。对这些大量数据的及时解读，将有助于台湾和美国以及世界其他地区正在进行的地震研究计划。数值模拟已被广泛用于了解地震灾害。它为测试不同的模型提供了一种有效的手段;它还可用于在没有数据的地点生成信息，从而允许在记录站之间进行插值。然而，最近的研究表明，这种模拟的结果是特别敏感的地震附近的沉积盆地的地下结构。因此，作为有意义的模拟的第一步，拟议的研究将集中于使用现有数据来定义与破裂的车笼埔断层相邻的沉积盆地的3D结构。如此重建的结构将是可靠地模拟地面运动和详细研究震源复杂性的先决条件。最后，重建的盆地结构将有助于其他拟议的项目，并将提供给研究界。重建台湾中部盆地结构所需的资料包括三维地壳速度结构、多道地震反射剖面、钻井资料和重力异常。三维地壳速度结构是最近发表的。中国石油总公司（CPC）收集了其他数据，作为该地区密集油气勘探的一部分。PI于1999年12月访问了CPC，并成功地获得了CPC勘探开发研究院院长林国安博士的合作支持，为拟议的研究提供了所需的数据。

Abstract for proposal EAR 0106802 (PH #56x)Title: A Proposal for 3D Basin Structure Reconstruction in Central Taiwan and 3D Simulation of Ground Motion and Deformation Related to the 1999 Chi-Chi (Mw=7.6) Earthquake, TaiwanPI's: Chi-Yuen Wang and Douglas S.Dreger, University of California, BerkeleyCreated by oblique collision between the Philippine Sea plate and the Eurasian plate since ~5 Ma, the island of Taiwan is one of the most rapidly rising mountain belts in the world. The 1999 Chi-Chi (Mw=7.6) earthquake, the biggest to hit the island in the last century, has created an unprecedented amount of accurate data and hence a watershed of research opportunity towards a better understanding of earthquake hazards, with a potential to significantly advance the state of knowledge. A timely interpretation of this great amount of data may benefit ongoing programs of earthquake research both in Taiwan and in the US and the other part of the world. Numerical simulation has been widely used for understanding of earthquake hazards. It provides an effective means for testing different models; it may also be used to generate information at locations where data are not available, allowing interpolation between the recording stations. However, recent investigations have shown that the results of such simulation are particularly sensitive to the subsurface structures of the sedimentary basins in the vicinity of the earthquake. Hence, as the first step to a meaningful simulation, the proposed research will focus on defining the 3D structure of the sedimentary basin adjacent to the ruptured Chelungpu fault, using the existing data. The structure so reconstructed will be a pre-requisite for reliable simulations of ground motion and for the detailed study of earthquake source complexity. Finally, the reconstructed basin structure will be useful for other proposed projects and will be made available to the research community. The data required for reconstructing the basin structure in central Taiwan include 3D crustal velocity structure, multi-channel seismic reflection profiles, drilling data and gravity anomalies. The 3D crustal velocity structure has been recently published. Other data have been collected by the Chinese Petroleum Corporation (CPC) as part of its intensive hydrocarbon exploration in this area. The PI visited CPC in December of 1999 and succeeded in getting the collaborative support of Dr. Kuo-An Lin, director of the Exploration and Development Research Institute of CPC, to provide the needed data for the proposed research.