| dc.description.abstract | We exam the association of the seismicity and the Coulomb stress changes after several large earthquakes in Taiwan region. Our study shows that most of large aftershocks occurred in the region with positive Coulomb stress changes, while the seismicity was decreased in the region of negative Coulomb stress changes. By observing the Coulomb stress changes, we might be able to have a further understanding on the occurrence of earthquakes. We choose three large earthquakes in Taiwan to explore the relationship between the Coulomb stress changes and aftershocks. Three large earthquakes were selected, as the Sep.21st , 1999, Chi-Chi earthquake, March 31st , 2002 , Hualien offshore earthquake, and Dec.10th, 2003, Chen-kung earthquake to calculate their Coulomb stress changes. If we consider about the focal mechanism of the aftershocks, lots of the earthquakes will locate at the positive area of the Coulomb stress change. We also test the different stress field, and we find that the suitable stress field keep the more events in positive area. And we try the test for accumulation of stress change, the number of events in positive area have be changed. We made a statistical studies to evaluate the occurrence of the aftershocks to the corresponding Coulomb stress change. Our result was made to the relation of earthquake magnitude, distribution and the Coulomb stress change. We found that earthquakes are concentrate in the area of having Coulombs stress changes of 0 to 1 bars, especially considering the focal mechanism. | en_US |