| Summary: | 碩士 === 國立中正大學 === 地震研究所暨應用地球物理研究所 === 97 === Taiwan is located in an active collisonal zone between the Eurasia continental and Philippine Sea plates.The violent collision between the two plates cause a series of imbricate fold-thrust belts to form between the western foothills and the coastal plain. The Chukou fault is the boundary between the fold-thrust belts and the coastal plain in the Chiayi-Tainan area. The seismotectonic structure beneath this area is complex.
We use the earthquake data recorded by the broadband stations which deployed by the National Chung Cheng University in the Chukou fault area. The year range of the data is from August, 2003 to December, 2004. We have chosen 1661 earthquake events, in this research. Cross correlation technique is applied to determine analyzed 143086 pair of waveform data. By combination with data from catalog data, there are 342202 absolute travel-time difference.We used TomoDD method to relocate earthquake and invert the 3D velocity structures beneath the Chukou fault area.
Our results indicate that to use both catalog and cross-correlation data in the inversion not only get better resolution, but also can obtain the 3D velocity structure at different depths more precisely.
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