湘东地区断裂活动性及潜在震源区划分研究
|
摘要
湘东地区(湖南省东部地区)地处华南褶皱系内,经历了多次构造运动,地层普遍褶皱,并伴有一系列NNE—NE向断裂,沿这些断裂形成一些断陷盆地;新构造运动期间,地壳运动以大面积整体性缓慢抬升为主要形式,差异性构造活动较弱,但该区发生了多次中强地震,断裂在第四纪早、中期有活动可能与中强地震的发生有关。文中在收集、分析研究区及附近地区前人工作成果的基础上,对常德-益阳-长沙断裂东南段、湘潭-邵东断裂东北段和永州-衡阳断裂开展了地质学、地貌学的野外考察,综合分析了这些断裂第四纪早、中更新世以来的活动性。采用"地震重复"和"构造类比"2条基本原则,依据特定地段的地质、地震和地球物理场等资料,认为这些断裂带不但具有中更新世活动形迹,而且沿带存在中强地震的潜在危险。综合社会和经济发展的需求等因素,将湘潭—湘乡、邵东、衡山—衡阳、永州等地带划分为新的潜在震源区。
Located in the south China fold system,the eastern Hunan area has experienced several tectonic movements,which resulted in wide-spread distribution of folds accompanied by a series of NNE-NE trending faults,and some rift basins were developed along these faults. During the neotectonic movement,the crustal movement was dominated by large-scale and overall slow uplift with weak differential tectonic movement. However,this area has experienced a number of strong earthquakes,which are supposed to be related to the fault activities in the mid-Quaternary. Based on the collection and analyses of previous results of research in this area and its neighborhood,in this study,we carried out field geological and geomorphologic investigation to the southeastern segment of Changde-Yiyang-Changsha Fault,the northeastern segment of the Xiangtan-Shaodong Fault,and the Yongzhou-Hengyang Fault. Comprehensive analysis was made on the activity of these faults during the early Pleistocene epoch based on the two basic principles of "earthquake recurrence" and "structural analogy". Based on the geological,seismic and geophysical data of specific sites,it is concluded that these fault zones not only put up the evidence of mid Pleistocene activities,but have potential risk of moderate earthquakes in the areas around the fault zones. Considering the needs for social and economic development and other factors,the Xiangtan-Xiangxiang,Shaodong,Hengshan-Hengyang,and Yongzhou areas are regarded as new potential source regions.
Located in the south China fold system,the eastern Hunan area has experienced several tectonic movements,which resulted in wide-spread distribution of folds accompanied by a series of NNE-NE trending faults,and some rift basins were developed along these faults. During the neotectonic movement,the crustal movement was dominated by large-scale and overall slow uplift with weak differential tectonic movement. However,this area has experienced a number of strong earthquakes,which are supposed to be related to the fault activities in the mid-Quaternary. Based on the collection and analyses of previous results of research in this area and its neighborhood,in this study,we carried out field geological and geomorphologic investigation to the southeastern segment of Changde-Yiyang-Changsha Fault,the northeastern segment of the Xiangtan-Shaodong Fault,and the Yongzhou-Hengyang Fault. Comprehensive analysis was made on the activity of these faults during the early Pleistocene epoch based on the two basic principles of "earthquake recurrence" and "structural analogy". Based on the geological,seismic and geophysical data of specific sites,it is concluded that these fault zones not only put up the evidence of mid Pleistocene activities,but have potential risk of moderate earthquakes in the areas around the fault zones. Considering the needs for social and economic development and other factors,the Xiangtan-Xiangxiang,Shaodong,Hengshan-Hengyang,and Yongzhou areas are regarded as new potential source regions.
引文
[1]北京中震创业工程科技研究院,2007,湖南桃花江核电厂可行性研究阶段地震安全性评价报告。
[2]中国地震局地质研究所等,2006,湖南大唐华银核电厂初可研阶段候选厂址地震地质调查及评价专题报告。
[3]国家地震局地质研究所,1990,湖南省常德市城区地震小区划研究报告。
[4]湖南省地质矿产局区测队,1975,零陵幅、衡阳幅区域地质调查报告。
[1]湖南省防震减灾工程研究中心,2001,湖南省人民政府机关新院建设项目地震安全性报告。
[2]国家地震局地质研究所,1990,湖南省常德市城区地震小区划研究报告。
[1]湖南省防震减灾工程研究中心,2003,湘潭电厂二期工程地震安全性评价报告。
[1]同490页[2]。
邓起东,闻学泽.2008.活动构造研究:历史、进展与建议[J].地震地质,30(1):1—30.DENG Qi-dong,WEN Xue-ze.2008.A review on the research of active tectonics:History,progress and suggestions[J].Seismology and Geology,30(1):1—30(in Chinese).
湖南省地质矿产局.1988.湖南省区域地质志[M].北京:地质出版社.Hunan Bureau of Geology and Mineral Resources.1988.Reglonal Geology of Hunan Province[M].Geological Pub-lishing House,Beijing(in Chinese).
胡聿贤.1999.地震安全性评价技术教程[M].北京:地震出版社.154—170.HU Yu-xian.1999.Tutorial of Seismic Safety Evaluation[M].Seismological Press,Beijing.154—170(in Chinese).
向宏发,韩竹军,张晚霞,等.2008.中国东部中强地震发生的地震地质标志初探[J].地震地质,30(1):202—208.XIANG Hong-fa,HANZhu-jun,ZHANG Wan-xia,et al.2008.Apreliminary study on seismogeologic evidence for mod-erate earthquakes in East China[J].Seismology and Geology,30(1):202—208(in Chinese).
张裕明,周本刚.1994.当前潜在震源区研究的主要方向[J].中国地震,10(1):1—8.ZHANG Yu-ming,ZHOUBen-gang.1994.Main tendency of the study on the potential earthquake region at present[J].Earthquake Research in China,10(1):1—8(in Chinese).
周本刚,张裕明,董瑞树,等.1997.划分潜在震源区的地震地质规则研究[J].中国地震,13(3):241—252.ZHOU Ben-gang,ZHANG Yu-ming,DONG Rui-shu,et al.1997.Study on the geological structural criteria on determi-nation of potential earthquake region[J].Earthquake Research in China,13(3):241—252(in Chinese).
[2]中国地震局地质研究所等,2006,湖南大唐华银核电厂初可研阶段候选厂址地震地质调查及评价专题报告。
[3]国家地震局地质研究所,1990,湖南省常德市城区地震小区划研究报告。
[4]湖南省地质矿产局区测队,1975,零陵幅、衡阳幅区域地质调查报告。
[1]湖南省防震减灾工程研究中心,2001,湖南省人民政府机关新院建设项目地震安全性报告。
[2]国家地震局地质研究所,1990,湖南省常德市城区地震小区划研究报告。
[1]湖南省防震减灾工程研究中心,2003,湘潭电厂二期工程地震安全性评价报告。
[1]同490页[2]。
邓起东,闻学泽.2008.活动构造研究:历史、进展与建议[J].地震地质,30(1):1—30.DENG Qi-dong,WEN Xue-ze.2008.A review on the research of active tectonics:History,progress and suggestions[J].Seismology and Geology,30(1):1—30(in Chinese).
湖南省地质矿产局.1988.湖南省区域地质志[M].北京:地质出版社.Hunan Bureau of Geology and Mineral Resources.1988.Reglonal Geology of Hunan Province[M].Geological Pub-lishing House,Beijing(in Chinese).
胡聿贤.1999.地震安全性评价技术教程[M].北京:地震出版社.154—170.HU Yu-xian.1999.Tutorial of Seismic Safety Evaluation[M].Seismological Press,Beijing.154—170(in Chinese).
向宏发,韩竹军,张晚霞,等.2008.中国东部中强地震发生的地震地质标志初探[J].地震地质,30(1):202—208.XIANG Hong-fa,HANZhu-jun,ZHANG Wan-xia,et al.2008.Apreliminary study on seismogeologic evidence for mod-erate earthquakes in East China[J].Seismology and Geology,30(1):202—208(in Chinese).
张裕明,周本刚.1994.当前潜在震源区研究的主要方向[J].中国地震,10(1):1—8.ZHANG Yu-ming,ZHOUBen-gang.1994.Main tendency of the study on the potential earthquake region at present[J].Earthquake Research in China,10(1):1—8(in Chinese).
周本刚,张裕明,董瑞树,等.1997.划分潜在震源区的地震地质规则研究[J].中国地震,13(3):241—252.ZHOU Ben-gang,ZHANG Yu-ming,DONG Rui-shu,et al.1997.Study on the geological structural criteria on determi-nation of potential earthquake region[J].Earthquake Research in China,13(3):241—252(in Chinese).
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心