High-Resolution Studies of Complex Faulting: Chi-Chi, Taiwan Earthquake

提案EAR0106701（PH #18x）摘要标题：复杂断层的高分辨率研究：台湾集集地震PI：近年来，地质学家和地球物理学家目睹了一场革命，一系列新的测量地壳运动的工具，包括全球定位卫星，干涉合成孔径雷达，和宽带数字地震系统，使运动检测精度的巨大进步。 日本和台湾率先安装了这些仪器，最近的台湾集集地震（1999年）序列产生了一组引人注目的数据。 目前，在距离小于50公里的距离上，已有300多个强震加速度记录可用于主事件，Mw = 7.7。 第一周发生了11次当地震级大于6级的余震，其中几次与北岭一样大。 现在可以研究大约10，000个数字三分量波形，以回答有关破裂速度变化，上升时间，非线性行为，盆地放大等问题。我们计划应用各种新开发的分析工具，包括小波变换，修改后的退火和伪格林函数来探索这些新数据。 特别地，我们计划使用静态数据来固定滑动历史或各种子断层，并使用校准的地震路径来约束上升时间和破裂速度

Abstract for proposal EAR0106701 (PH #18x)Title: High-Resolution Studies of Complex Faulting: Chi-Chi, Taiwan Earthquake PI's: Donald V. Helmberger, CalTechIn recent years, geologists and geophysicists have witnessed a revolution in the development and implementation of an array of new tools for measuring motions of the earth's crust, including global positioning satellites, interferometric synthetic aperture radar, and broadband digital seismic systems, allowing tremendous advances in motion detection accuracy. Japan and Taiwan took the lead in the installation of these instruments, and the recent Chi-Chi, Taiwan earthquake (1999) sequence has produced a remarkable set of data. Over 300 strong-motion acceleration records at distances less than 50 km are now available for the main event, Mw = 7.7. Eleven aftershocks with local magnitudes greater than 6 occurred in the first week, several as large as Northridge. About 10,000 digital 3-component waveforms can now be studied to answer questions about variation in rupture velocity, rise-time, nonlinear behavior, basin amplification, etc. We plan to apply an assortment of newly developed analytical tools involving wavelet transforms, modified annealing, and Pseudo-Green's Functions to explore these new data. In particular, we plan to fix the slip-histories or various sub faults using the static data and using calibrated seismic paths to constrain the rise-time and rupture velocity