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

建议摘要EAR0106701(PH#18x)标题：高分辨率研究复杂断层：集集，台湾地震Pi：Donald V.Helmberger，加州理工近年来，地质学家和地球物理学家见证了一系列测量地壳运动的新工具的开发和实施方面的革命，这些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，使得运动检测精度得到了极大的提高。日本和台湾率先安装了这些仪器，最近台湾集集(1999)地震序列产生了一组引人注目的数据。现在有300多个距离小于50公里的强震加速记录可用于主震，MW=7.7。第一周发生了11次当地震级超过6级的余震，其中几次余震的震级与北岭相当。现在可以研究大约10,000个数字三分量波形，以回答破裂速度变化、上升时间、非线性行为、盆地放大等问题。我们计划应用一系列新开发的分析工具来探索这些新数据，包括小波变换、修改的退火法和伪格林函数。特别是，我们计划使用静态数据来修复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