南北地震带中南段断层现今活动
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摘要
分析了南北地震带中南段流动形变资料 ,研究了断层现今活动的空间分布及特征。结果表明 ,红河断裂带、楚雄 -通海断裂带及鲜水河断裂带活动水平最高 ,龙门山断裂带活动最弱 ;断层活动水平近年总体未见加剧或减缓。研究认为 :强震前区域断层活动加剧 ;断层突然错动引起的位移在地质资料显示的断层位移中占主要成分 ;近期南北地震带南段仍将保持近 2 0年强震频发的态势 ,中段近年有发生 6级地震的可能 ;楚雄 -通海断裂带中段及鲜水河断裂带两端 ,为值得注意的强震危险区
In this paper the authors have analyzed the data of mobile geodetic deformation along the middle and southern segments of South North Seismic Belt and studied the spatial distribution and characteristics of fault activity in recent time. The results show that the fault activity rate along Honghe Chuxiong Tonghai fault and Xianshuihe fault is the highest and Longmenshan fault is the slowest. Fault activity levels in the recent years have not intensified or become weaker in general. Through studies the authors put forward several viewpoints as follows: Regional fault activity strengthens before strong earthquakes. Sudden fault displacement possesses an important part of fault movement, which exhibited in the geologic data. Along southern segment of South North Seismic Belt in the near future there will keep the same state of high frequency of strong earthquake occurrence as in the past 20 years. Along the middle segment of South North Seismic Belt there is a possibility that the earthquake with M S=6 may occur in recent years. The middle of Chuxiong Tonghai fault and the two ends of Xianshuihe fault are risk locations of strong earthquakes, which deserve the notice.
In this paper the authors have analyzed the data of mobile geodetic deformation along the middle and southern segments of South North Seismic Belt and studied the spatial distribution and characteristics of fault activity in recent time. The results show that the fault activity rate along Honghe Chuxiong Tonghai fault and Xianshuihe fault is the highest and Longmenshan fault is the slowest. Fault activity levels in the recent years have not intensified or become weaker in general. Through studies the authors put forward several viewpoints as follows: Regional fault activity strengthens before strong earthquakes. Sudden fault displacement possesses an important part of fault movement, which exhibited in the geologic data. Along southern segment of South North Seismic Belt in the near future there will keep the same state of high frequency of strong earthquake occurrence as in the past 20 years. Along the middle segment of South North Seismic Belt there is a possibility that the earthquake with M S=6 may occur in recent years. The middle of Chuxiong Tonghai fault and the two ends of Xianshuihe fault are risk locations of strong earthquakes, which deserve the notice.
引文
[1 ] 闫志德 ,李海华 ,杨斌 ,等 .论中国南北地震带 [A] .国家地震局科技监测司 .近期强震危险性研究 [C] .北京 :地震出版社 ,1 989.2 4 0 - 2 4 8.
[2 ] 马杏垣 ,丁国瑜 ,高文学 ,等 .中国岩石圈动力学地图集 [C] .北京 :中国地图出版社 ,1 989.49- 51 .
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[4] 张俊昌 ,张双林 ,冯巨鼎 ,等 .云南现代断裂活动与地震危险性分析 [A] .国家地震局科技监测司 .近期强震危险性研究 [C] .北京 :地震出版社 ,1 989.2 60 - 2 66.
[5] 车兆宏 ,范燕 .华北地区现今断层活动速率及动态特征 [J] .地震地质 ,1 999,2 1 (1 ) :69- 76.
[6] 范燕 ,车兆宏 .南北地震带北段及其两侧断层现今活动性 [J] .地震 ,2 0 0 0 ,2 1 (2 ) :87- 93.
[7] 李克昌 ,陈光曙 .岩石圈动力学区域各论 [A] .丁国瑜 .中国岩石圈动力学概论 [C] .北京 :地震出版社 ,1 991 .430 - 4 37.
[8] 潘祖寿 ,廖玉华 ,崔黎明 .岩石圈动力学区域各论 [A] .丁国瑜 .中国岩石圈动力学概论 [C] .北京 :地震出版社 ,1 991 .467- 4 71
[2 ] 马杏垣 ,丁国瑜 ,高文学 ,等 .中国岩石圈动力学地图集 [C] .北京 :中国地图出版社 ,1 989.49- 51 .
[3] 黄全忠 ,蒲玉泰 .岩石圈动力学区域各论 [A] .丁国瑜 .中国岩石圈动力学概论 [C] .北京 :地震出版社 ,1 991 .41 6- 4 2 3.
[4] 张俊昌 ,张双林 ,冯巨鼎 ,等 .云南现代断裂活动与地震危险性分析 [A] .国家地震局科技监测司 .近期强震危险性研究 [C] .北京 :地震出版社 ,1 989.2 60 - 2 66.
[5] 车兆宏 ,范燕 .华北地区现今断层活动速率及动态特征 [J] .地震地质 ,1 999,2 1 (1 ) :69- 76.
[6] 范燕 ,车兆宏 .南北地震带北段及其两侧断层现今活动性 [J] .地震 ,2 0 0 0 ,2 1 (2 ) :87- 93.
[7] 李克昌 ,陈光曙 .岩石圈动力学区域各论 [A] .丁国瑜 .中国岩石圈动力学概论 [C] .北京 :地震出版社 ,1 991 .430 - 4 37.
[8] 潘祖寿 ,廖玉华 ,崔黎明 .岩石圈动力学区域各论 [A] .丁国瑜 .中国岩石圈动力学概论 [C] .北京 :地震出版社 ,1 991 .467- 4 71
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