福建晋江下游北西向断裂带活动性研究
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摘要
本文以丰富和翔实的地质、地貌、年代测定、地球物理、地震等资料,阐述了晋江下游北西向断裂带的几何特征,分析了断裂带晚更新世以来的活动性,并探讨了断裂活动与地震的关系。结果表明:(1)晋江下游北西向断裂带从南安仑苍到晋江河口形迹清晰,断裂规模自西北向东南不断增大;(2)晋江下游北西向断裂带晚更新世以来,不同段落的活动性亦表现出自西北向东南不断增强和变新的特点,南安仑苍-丰州段为早第四纪断裂,丰州-晋江河口段发育有晚更新世断裂;(3)沿晋江下游北西向断裂带,在其与北东向断裂交汇部位附近,历史上曾发生过6次中强地震,地震有自西北向东南频度升高和强度增大的趋势。
The NW-striking fault zone along downriver of Jinjiang in Fujian province is distributed along Jinjiang river in the region from Luncang in Nan’an to Jinjiang, with a general strike of about 300°—310° and dip to NE or SW with dip angle of 55°—85°, controlling the boundary of Quanzhou Basin. Through combined analysis of Quaternary geology, geomorphology, dating, geophysics and earthquake, the Quaternary active character of the NW- striking fault along downriver of Jinjiang we found that: (1) The NW-striking fault zone is more clearly exposed from Luncang in Nan’an to Jinjiang in the downriver of Jinjiang, with the increase in scale from northwest to southeast; (2) The last active time changes at different segments, in which Zhengshan-Qifeng fault (F1), Shijiao fault (F2), Tindian fault (F5) and Jinjiang Dongshan-Shedian fault (F6) are active in early-middle Quatemary, but Qingyuanshan fault (F3) and Wushi-Caiaa fault (F4) are active in late Quatemary; (3) About 6 middle-strong historical earthquakes occurred at the intersections of NW-striking fault zone along downriver of Jinjiang and some NE-striking faults. The trend of earthquake frequency and intension increased from northwest to southeast.
The NW-striking fault zone along downriver of Jinjiang in Fujian province is distributed along Jinjiang river in the region from Luncang in Nan’an to Jinjiang, with a general strike of about 300°—310° and dip to NE or SW with dip angle of 55°—85°, controlling the boundary of Quanzhou Basin. Through combined analysis of Quaternary geology, geomorphology, dating, geophysics and earthquake, the Quaternary active character of the NW- striking fault along downriver of Jinjiang we found that: (1) The NW-striking fault zone is more clearly exposed from Luncang in Nan’an to Jinjiang in the downriver of Jinjiang, with the increase in scale from northwest to southeast; (2) The last active time changes at different segments, in which Zhengshan-Qifeng fault (F1), Shijiao fault (F2), Tindian fault (F5) and Jinjiang Dongshan-Shedian fault (F6) are active in early-middle Quatemary, but Qingyuanshan fault (F3) and Wushi-Caiaa fault (F4) are active in late Quatemary; (3) About 6 middle-strong historical earthquakes occurred at the intersections of NW-striking fault zone along downriver of Jinjiang and some NE-striking faults. The trend of earthquake frequency and intension increased from northwest to southeast.
引文
1福建地震地质工程勘察院,2000.泉州后渚特大桥工程场地地震安全性评价报告.
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廖其林,王振明,王屏路,余兆康,吴宁远,刘宝诚,1988.福州-泉州-汕头地区地壳结构的爆炸地震研究.地球物理学报,3期:270—280.
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丁祥焕,黄卿团,庄进耀,1992.福建省长乐-诏安断裂带晚第四纪活动性的分析.见:活动断裂研究(2),国家地震局地质研究所编.北京:地震出版社,224—235.
丁祥焕,王耀东,叶盛基等,1999.福建东南沿海活动断裂与地震.福州:福建科学技术出版社.
黄卿团,丁祥焕,庄进耀,1999.福建东南沿海晚第四纪断陷构造的形成和发育.见:活动断裂研究(7),国家地震局地质研究所编.北京:地震出版社,67—80.
黄卿团,汪一鹏,宋方敏,2001.福建泉州清源山北西向断裂晚第四纪以来活动特征.见:活动断裂研究(8),国家地震局地质研究编.北京:地震出版社,111—119.
廖其林,王振明,王屏路,余兆康,吴宁远,刘宝诚,1988.福州-泉州-汕头地区地壳结构的爆炸地震研究.地球物理学报,3期:270—280.
朱金芳,徐锡伟,黄宗林等,2005.福州市活断层探测与地震危险性评价.北京:科学出版社.
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