Crustal Structure Inversion Across Central Taiwan fromDiLi Test-shot Data

Yung-En Yu

Abstract

High energy explosive source for wide-angle active and passive experiment (TAIGER) will be performed in 2007. To answer question like propagation attenuation effects and choosing the receiver location, a test-shot was carried out in DiLi at central Taiwan on 6 October, 2006. This research is utilizing the seismic travel-time to estimate a simple velocity structure.

A sedimentary basin velocity model estimated through V0-k method by integrating borehole and seismic data from CPC (master thesis, Chen, 2006) to within 5 km is incorporated to modify the existing Taiwan 3-D models (Kim el. al., 2005 and Wu et. al., 2007). Utilizing this updated 3-D velocity model to build a starting model for travel-time inversion. The seismic travel-time inversion is including forward modeling by ray tracing and damping least-square inversion. I utilize the forward modeling to help me identify later arrival phase. Final, I use first arrival travelt-time and a later reflection travel-time to constraint a three layers velocity structure.

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