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1
題名:Relocation of Eastern Taiwan Earthquakes and Tectonic Implications    
著者:Hao KuochenYih-Min WuChien-Hsin ChangJyr-Ching HuWen-Shan Chen
出版地區:台灣
出版城市:台北市
學科:地球科學
關鍵字:Earthquake ; Focal mechanism solution ; Tectonics ; Eastern Taiwan ; Plate boundary
刊名:Terrestrial, Atmospheric and Oceanic Sciences
卷期:15卷4期(2004.11)
頁碼:647-666
語言:英語
摘要: 英文摘要PDF

We relocated 6,173 shallow earthquakes and determined focal mechanism solutions of thirty-three ML?5.0 events in the eastern Taiwan region (bounded by 22.7°N, 120.8°E; 24.5°N, 121.5°E; 24.3°N, 122.3°E and 22.5°N, 121.6°E) in order to investigate their tectonic implications. Our resuits suggest that the distribution of the relocated earthquakes generally agrees with the fault plane determined from the focal mechanism solutions. The Longitudinal Valley (LV) is an east-dipping seismic suture zone that separates two different tectonic regions. On the left-hand side of the LV, shallow earthquakes and normal fault-type focal mechanism were found in the Central Range region. But on the right-hand side of the LV, most events that occurred in the Philippine Sea Plate (PSP) were the thrust-type, especially for the southern portion and a few normal and strike-slip focal mechanism events were observed in the northern portion. The tectonics of eastern Taiwan can be classified from south and north into two regions, and there may exist a structure or boundary at about latitude 23.5°N with a strike of N110°E. In the northern portion of eastern Taiwan, the plate boundary appears to be an east-dipping plane defined by the earthquake distribution. The focal mechanism solutions determined in this zone show thrust type faulting and agreed with this boundary plane (strike N20°E and dip about 500). In this region, the Eurasia Plate (EP) dips to the east, and the PSP bends and dips to west. Thus, shallow earthquakes with normal and strike-slip focal mechanisms were observed in the offshore area of this region. On the other hand, the southern part of eastern Taiwan exhibits simple tectonics conditions. The EP subducts to the east under the PSP. The LV is a suture zone dipping to the east, and most events have occurred on the right-hand side of the LV. Focal mechanism solutions of these events were thrust-type with strike about N25°E and dip 54° to the east.


    

本卷期目次
Terrestrial, Atmospheric and Oceanic Sciences 15卷4期 (2004.11)
Morphology and Dynamic Sedimentology in front of the Retreating Tsengwen Delta, Southwestern Taiwan/ Eason HongTien-Chi HuangHo-Shing Yu
Improvement of GPS/MET Ionospheric Profiling and Validation Using the Chung-Li Ionosonde Measurements and the IRI model/ Lung-Chih TsaiWei-Hsiung Tsai
Investigating Subsurface Structures and P- and S-wave Velocities in the Taipei Basin/ Chien-Ying WangYi-Hen LeeMang-Long GerYi-Ling Chen
Analyzing the Relationship between Terminal Velocity of Raindrops and VHF Backscatter from Precipitation/ Ching-Lun SuYen-Hsyang ChuChun-Yi Chen
Relocation of Eastern Taiwan Earthquakes and Tectonic Implications/ Hao KuochenYih-Min WuChien-Hsin ChangJyr-Ching HuWen-Shan Chen
Multi-station Studies on Spread-F and VHF Scintillations in the Indian Sector/ P. V. S. Rama RaoD. S. V. V. D. PrasadK. NiranjanG. UmaS. Gopi KrishnaK. Venkateswarlu
Coseismic Movement and Seismic Ground Motion Associated with the 31 March 2002 off Hualien, Taiwan, Earthquake/ Horng-Yue ChenLong-Chen KuoShui-Beih Yu
Assessment of Traffic Contribution to Hydrocarbons Using 2,2-Dimethylbutane as a Vehicular Indicator/ Chih-Chung ChangTai-Yih ChenClock ChouShaw-Chen Liu
Ethology of the Zoophycos-Producer: Arguments Against the Gardening Model from δ13Corg Evidences of the Spreiten Material/ Ludvig LowemarkIn-Tian LinChung-Ho WangChih-An HuhKuo-Yen WeiChih-Wei Chen
Source Parameters of Regional Earthquakes in Taiwan: January-December, 2002/ Wen-Tzong LiangYu-Hua LiuHonn Kao
An Improved Estimate of Layer Thickness in the Atmosphere Using Dual-Frequency Interferometry Method of MST-VHF Radar/ Jenn-Shyong ChenYen-Hsyang Chu
 
   
 
   

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