HR: 1340h
AN: T23D-1666    [Abstracts]
TI: The 3-D density structure of Taiwan Area by using converted tomographic model
AU: * Hsieh, H
EM: denny.hsieh@gmail.com
AF: Institute of Geophysics, National Central University, No. 300, Jhongda Rd., Jhongli, 320, Taiwan
AU: Yen, H
EM: yenhy@earth.ncu.edu.tw
AF: Institute of Geophysics, National Central University, No. 300, Jhongda Rd., Jhongli, 320, Taiwan
AB: Taiwan situated at the collision between the Eurasian plate and the Philippine Sea plate with different subduction polarity in the north and the south Taiwan. The complex tectonic background maked varied geologic structures beneath Taiwan. In order to obtain more detail and more significant information about the structure beneath Taiwan, it would be better to join two or three kinds of geophysical data to investigate the subsurface formation beneath Taiwan. Most usually, use the tomography from seismic data to derive the velocity and the velocity gradient between the interfaces. In this study, we converted the P wave velocity to density by using three different tomography results in Taiwan (Rau, 1995, Ma, 1996 and Kim, 2005). The method we use to convert the P wave velocity and density is referencd to Nafe & Drake, 1957 and Barton, 1986. We used the converted density model as initial model to calculate theoretical bouguer anomaly and inverse the proper density structure. We compared with the final inversed density results of these three different velocity-density initial models. While these three density results might not fit data very well, we still can have an idea which one is better than others. In realistic world, the more physical parameters are thought about, the more reality can be achieved. In this study, the result is expected for satisfying both tomography and density model.
DE: 1219 Gravity anomalies and Earth structure (0920, 7205, 7240)
SC: Tectonophysics [T]
MN: 2007 Fall Meeting