Surface-wave Tomography of Taiwan Region using Ambient Noise Analysis

We apply the ambient noise tomography (ANT) to Taiwan. One of the distinctive advantages of ANT is that its path coverage is directly provided by the available inter-station paths. The high-density seismic networks in Taiwan thus offer a great opportunity for high resolution models with ANT. Besides two major seismic networks, Central Weather Bureau Seismic Network, and Broadband Array in Taiwan for Seismology, we have also incorporated the continuous broad-band data from three east-west linear arrays of the TAiwan Integrated GEodynamics Research (TAIGER) project. With above permanent and temporary seismic networks, we have achieved unprecedented path coverage of surface wave study in Taiwan. In particular, the unique geometry of TAIGER arrays allows us to largely improve the lateral resolution of the NNE-SSW Taiwan tectonic trend. With the measured robust dispersion data, we first examine two recent body-wave-derived 3D tomographic models of Taiwan, and then construct 2D surface wave velocity maps and 3D Vs structures using multi-scale inversion technique.