Waveform Tomography from an Executed Big Footprint Experiment: The Chi-Chi (Taiwan) Earthquake

本计画将利用1999年台湾集集主震及其几次大余震的优良资料，加上三年来数百次较小（M ~4 - 5）地震的背景强震记录，进行三维地壳结构研究。 这些地震是由700个自由场数字强震站、75个三分量短周期台网和12个宽带强震站记录的。 研究人员将利用上述数据集研究台湾西南部的一个大型沉积盆地，目的是推断分辨率高达3 s周期的三维地壳结构。 上地壳结构将通过标准阵列处理技术确定，该技术使用周期范围为3 - 15秒的一维表面波相位速度反演分析。 下地壳结构可以通过宽带台站阵列记录的长周期（10 s - 100 s）面波频散数据来确定。 一组相邻的一维地壳模型将被拼接在一起，以获得三维地壳结构。

EAR-0001016Teng, Ta-liangThis project will carry out a 3D crustal structure study making use of the excellent data set recovered from the 1999 Chi-Chi (Taiwan) mainshock and several of its large aftershocks, plus three year worth of seismic background strong-motion recordings of several hundreds smaller (M ~4 - 5) events. These events are recorded by (1) a complement of 700 freefield digital strong-motion stations, (2) 75 3-componeent short-period network stations and (3) 12 broadband stations. The investigators will use the above data set to study a large sedimentation basin in southwestern Taiwan, with the objective to deduce a 3D crustal structure of resolution up to 3 s period. The upper crustal structure will be determined by a standard array processing technique using 1D surface-wave phase velocity inversion analysis for the period range 3 - 15 s. Lower crustal structure can be determined by dispersion data of long-period (10 s - 100 s) surface waves recorded at an array of broadband stations. A group of adjacent 1D crustal models will be pieced together to obtain a 3D crustal structure.