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

本项目将利用从1999年台湾集集主震和几次大余震中恢复的优秀数据集，加上三年来数百次较小（M ~4 - 5）事件的地震背景强震记录，进行三维地壳结构研究。这些事件由(1)700个自由场数字强震站，(2)75个3分量短周期网络站和(3)12个宽带站记录。研究人员将利用上述资料研究台湾西南部的一个大型沉积盆地，目的是推断出分辨率高达3秒周期的三维地壳结构。利用一维面波相速度反演分析，在3 ~ 15 s周期范围内，采用标准阵列处理技术确定上地壳结构。利用宽带台站阵列记录的长周期（10 - 100秒）面波频散数据，可以确定下地壳结构。将一组相邻的一维地壳模型拼接在一起，得到三维地壳结构。

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.