| dc.description.abstract | Taiwan Island is located between the Philippine Sea Plate and the Eurasian Plate. However, in the BATS earthquake catalog, an interesting thing we can find is that the focal mechanisms in the southern Central Range are normal faults and strike-slip faults, but not reverse faults. Therefore, our study uses the numerical simulation method to solve the three-dimensional geodynamics. Under the simplified model design, explore how the tectonic development of the southern Central Range forms normal faults earthquakes. Due to the difference in the orogeny sequence between the north and the south of Taiwan, the northern part of our study area has completed orogeny, but the southern part not yet. So, our study assumed that the material in the Central Range will flow to the south.
The results verified that the material must have a north-south flow to be consistent with the current situation. On the one hand, the normal fault earthquake is caused, and on the other hand, it is also the source of the orogenic material of the Hengchun Peninsula. Other results show the density of ductile Central Range must be lower than the density of the lower crust in the Western Foothills and Coastal Range, as well as the density of brittle part as much as possible. To sum up the above, the complexity of the southern Central Range includes vertical, east-west, and north-south factors, which cannot be simply explained through a two-dimensional model, and must be discussed in a three-dimensional way. | en_US |