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題名 | 1935年新竹、臺中地震與1999年921集集大地震之斷層模型與地殼構造的背景=Faults and Tectonic Background of 1935 Hsinchug-Taichung Earthquake and 1999 Taiwan Earthquake |
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作者姓名(中文) | 許華杞; 游麗方; 佐藤裕; | 書刊名 | 測量工程 |
卷期 | 42:4 2000.12[民89.12] |
頁次 | 頁17-36 |
分類號 | 353.4 |
關鍵詞 | 集集大地震; 斷層模型; 地殼構造; 紙湖斷層; 車籠埔斷層; 臺灣; |
語文 | 中文(Chinese) |
中文摘要 | 1935年新竹.臺中地震及1999年921集集大地震之主斷層分別是紙湖斷層及車籠埔斷層,兩者的位置接近,且約略呈南北一直線排列,但前者為向西傾之逆斷層,後者則是向東傾之逆斷層。震區之地形自東向西為中央山脈山麓、臺中盆地、臺地及海岸平原。1999年之地震斷層位於山麓西側,而1935年者在平臺之東邊,該兩斷層就臺中盆地而言處於相互對稱之位置。應用測地數據(Geodetic)所得之斷層模型,算出1935年地震之能量為0.3×1020N.m,而從GPS與水準測量數據估算得1999年地震之能量達4.3×1020N.m。利用1999年地震之水準測量數據做出靜態斷層模型,從此模型算出之水平移動幾乎與GPS觀測結果一致。兩次地震之地體構造背景從地質學、地震學與地殼運動觀點加以討論,臺灣之地體構造之特徵為菲律賓海板塊及歐亞大陸板塊在臺灣東部衝擠。 |
英文摘要 | Main fault of the 1935 quake is of westward dipping reverse-type and that of the 1999 quake is an east dipping reverse fault, though the both fault are located and are aligned nearly straight from north to south. The topographical arrangement in the focal area is, from east to west, Foothill of Central Range, Taichung basin, Platform and Coastal Plain. The 1999 fault is located at the western side of the Foothill and that of 1935 is at the eastern side of the platform. The both faults have symmetrical location with respect to the Taichung basin. Seismic moment (Mo) of 1935 earthquake is obtained as 0.3.1020N.m from the fault model using geodetic data, and that of 1999 quake is estimated as 0.3.1020N.m from the GPS and leveling data. A static fault model by the leveling data of 1999 Taiwan quake is presented. Horizontal movements calculated from the model are nearly consistent with those observed by GPS. The tectonic background of the both earthquake is discussed from the viewpoints of geology, seismology and crustal movement. Tectonics of Taiwan is characterized by the collision between Philippine Sea plate and Eurasian plate at eastern Taiwan. |
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