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

题目：台湾中部三维盆地结构重建和1999年台湾Chi-Chi （Mw=7.6）地震相关地面运动和变形三维模拟的建议pi’s: Chi-Yuen Wang和Douglas S.Dreger，加州大学伯克利分校台湾岛是由菲律宾海板块和欧亚板块自~5 Ma以来的斜碰撞形成的，是世界上上升最快的山带之一。1999年的赤赤地震（Mw=7.6）是上个世纪袭击该岛的最大地震，它创造了前所未有的大量准确数据，从而为更好地了解地震危害提供了研究机会的分水岭，有可能大大提高知识水平。对这些大量数据的及时解释可能有利于台湾、美国和世界其他地区正在进行的地震研究项目。数值模拟已广泛应用于对地震灾害的认识。它为测试不同的模型提供了有效的手段；它也可用于在没有数据的地点产生信息，允许在记录站之间进行插值。然而，最近的研究表明，这种模拟结果对地震附近沉积盆地的地下构造特别敏感。因此，作为有意义的模拟的第一步，我们将利用现有数据，重点确定车隆堡断裂断裂附近沉积盆地的三维结构。这样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，重建的盆地结构将对其他拟议的项目有用，并将提供给研究界。重建台湾中部盆地构造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等。最近发表了三维地壳速度结构。中国石油公司（CPC）在该地区进行了密集的油气勘探，并收集了其他数据。PI于1999年12月访问了中国科学院，并成功地得到了中国科学院勘探开发研究所所长林国安博士的合作支持，提供了研究所需的数据。

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.