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題名 | 從臺灣中部地區西部麓山帶的地質構造來看集集地震斷層的特性=Characteristics of Thrust System in Relation with the 1999 Chi-chi Earthquake Ruptures in the Western Foothills, Central Taiwan |
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作者 | 陳文山; 楊志成; 黃柏壽; 陳于高; 石瑞銓; 李元希; 張徽正; 黃能偉; 林清正; 宋時驊; 李昆杰; | 書刊名 | 地質 |
卷期 | 21:1 民90.09 |
頁次 | 頁19-36 |
分類號 | 353.4 |
關鍵詞 | 臺灣; 麓山帶; 地質構造; 集集地震; 斷層; |
語文 | 中文(Chinese) |
中文摘要 | 921集集地震所形成的地表斷裂,主要沿著車籠埔斷層(大尖山斷層)與石岡斷層跡分布,而在石岡-卓蘭地區形成地表淺處的褶皺變形與小區段的斷層。從地層模擬結果顯示,在卓蘭-石岡地區的地下沿著三義斷層跡附近的地表。 震源區的構造環境屬於逆衝斷層構成的褶皺造山帶,從斷層面上具有巨大面積的凸起體的原因以及GPS的資料所呈現地表變形資料來看,本文作者推測地震的震源是發生在車籠埔-三義斷層的斷坡上。GPS資料顯示在斷層上盤寬約5-20公里的地帶呈現地表隆起的現象,而在隆起區的東側則呈現下陷,下陷區應是位於脫底斷層之上的構造環境。從921集集地震的資料來看,逆衝斷層的斷坡構造是在造山帶地區醞釀大地震的主要震源區之一。 |
英文摘要 | The earthquake occurred as two distinct subevents and triggered two different faults forming the surface ruptures of the Shihkang, Chelungpu, and Tajianshan faults. The Shihkang fault occurs in the Chinshui Shale and is interpreted as bedding-plane slip fault. The Chelungpu, and Tajianshan faults separates the hinterland covered with Late Pliocene sediments from the Taichung piggyback basin with recent alluvium. Our synthesis of geological, geodetic, and seismological analyses show the importance of ramp structures associated with thrust faults for generating large earthquakes and provides a general framework for understanding earthquakes in fold-and-thrust belts, central Taiwan. Large surficial coseismic uplift and strong asperities appears to be a function of fault ramp geometry. Our analysis indicates that ramp structures in fold and thrust belts have a high potential for producing large but in frequent earthquakes. |
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