福建闽江断裂带第四纪活动特征
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摘要
本文通过地貌、第四纪地层、钻探、槽探和浅层地震勘探等资料分析,研究了闽江断裂带第四纪活动特征,并探讨了活动断裂与地震的关系。结果表明:(1)闽侯-南屿断裂展布于旗山东侧山前,与五虎山北麓断裂共同组成北西向的闽江断裂带,控制了福州盆地的西侧和南侧边界;(2)闽江断裂带的活动时代从山地向平原方向逐渐变新,山地基岩内的断裂为中更新世断裂,山前断裂多为晚更新世断裂,呈正断性质,上盘沉积速率为0.78mm/a—1.2mm/a;(3)闽江断裂带及其与北东向断裂交汇部位附近小震活动相对密集。
Through comprehensive analysis of Quaternary strata, drilling, trenching and high-resolution seismic reflection, the characteristics of Minjiang fault and its relation to seismic activity are discussed. The major conclusions include: 1) Minhou-Nanyu fault is distributed along the eastern hill-foot of Mt. Qishan, which closely associated with Baisha-Mazhou NW-trending gravity anomaly and aeromagnetic anornaly belts, forming Minjiang NW-striking fault zone together with Wuhushan fault, which controlling the west and south boundaries of Fuzhou basin; 2) the active age of Minjiang fault is varies from middle Pleistocene in mountain area to late Pleistocene in plain area, which are characterized by normal faulting with the deposition rate of 0.78mm/a—1.2mm/a; 3) the intersections of Minjiang faults with some NE-striking faults are just the places where small earthquakes are concentrated in.
Through comprehensive analysis of Quaternary strata, drilling, trenching and high-resolution seismic reflection, the characteristics of Minjiang fault and its relation to seismic activity are discussed. The major conclusions include: 1) Minhou-Nanyu fault is distributed along the eastern hill-foot of Mt. Qishan, which closely associated with Baisha-Mazhou NW-trending gravity anomaly and aeromagnetic anornaly belts, forming Minjiang NW-striking fault zone together with Wuhushan fault, which controlling the west and south boundaries of Fuzhou basin; 2) the active age of Minjiang fault is varies from middle Pleistocene in mountain area to late Pleistocene in plain area, which are characterized by normal faulting with the deposition rate of 0.78mm/a—1.2mm/a; 3) the intersections of Minjiang faults with some NE-striking faults are just the places where small earthquakes are concentrated in.
引文
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:国家地震局地质研究所编,活动断裂研究(2).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:国家地震局地质研究所编,活动断裂研究(7).北京:地震出版社,67—80.
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.
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:国家地震局地质研究所编,活动断裂研究(7).北京:地震出版社,67—80.
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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