| 英文摘要 |
A micro-earthquake monitoring network for the Science parks of Taiwan was set up to evaluate the activities and source parameters of active faults using dense broadband seismometers. In 2010, we relocated the earthquakes we observed based on the double-difference earthquake location algorithm and solved the focal mechanisms to understand the relations between micro-earthquakes and the faults or other seismogenic structures. Many earthquakes had concentrated on the southeastern side of the Tapingti Fault in Hsinchu, Taiwan. The spatial distribution of earthquake occurrences slightly dipped to southeast. The seismicity in the southeast side of the Shihtan and Shenchoshan Faults in Miaoli is also high. But, the densest and most active seismogenic area is located in the Sanyi-Puli double-seismic zone. The earthquakes in this seismic zone are separated into two groups that are dipped to southeast direction with different dip angle. In the Southern Taiwan Science Park(STSP) area, the high seismicity is along the Chukou, Muchiliao and Liuchia Faults. In the northern region of STSP, the earthquakes concentrated in the eastern side of Tachienshan and Chukou Faults. Furthermore, an unusual earthquake group with high and concentrated seismicity was observed at the northern end of the Chishan Fault. The linear and dipping seismic structure and focal mechanisms suggest the activity of the north Chishan Fault. However, the seismicity is both quiet in the areas near the Meishan and Hsinhua Faults which have dislocated and induced massive and destructive earthquakes in history. |
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