三峡水库重点监视区蓄水前后震源机制研究
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摘要
利用2000～2006年三峡工程诱发地震监测系统数字遥测地震台网监测数据,对其水库重点监视区内震源机制进行了解析。结果表明,蓄水前震源机制为走滑-逆断性质,水平最大主压应力方向近东西向,P轴仰角较小,近水平,与区域主压应力一致;蓄水后震源机制为走滑-正断性质,水平最大主压应力方向各异,P轴仰角较大,明显不受区域应力场控制,这种现象可能与水库诱发地震成因机制的复杂性有关。
By use of the data from digital telemetered seismic network of induced earthquake monitoring system in the Three Gorges area from 2000 to 2006,the focal mechanisms in key monitoring area of the Three Gorges reservoir are calculated.The results show that the focal mechanism parameters of earthquakes before impoundment are strike-slip-reverse fault, the maximum horizontal principal compressive stress is near EW while P axis elevation is small,i.e. P axis is near horizontal,it is consistent with the regional principal compressive stress; the focal mechanism parameters of earthquakes after impoundment are strike-slip-normal,P axis elevation is near vertical,the directions of maximum horizontal principal compressive stress axis are mussy and are not controlled by regional principal compressive stress.This state implies that the complex focal mechanisms may be correlated with the complex seismogenic mechanisms of the induced earthquake.
By use of the data from digital telemetered seismic network of induced earthquake monitoring system in the Three Gorges area from 2000 to 2006,the focal mechanisms in key monitoring area of the Three Gorges reservoir are calculated.The results show that the focal mechanism parameters of earthquakes before impoundment are strike-slip-reverse fault, the maximum horizontal principal compressive stress is near EW while P axis elevation is small,i.e. P axis is near horizontal,it is consistent with the regional principal compressive stress; the focal mechanism parameters of earthquakes after impoundment are strike-slip-normal,P axis elevation is near vertical,the directions of maximum horizontal principal compressive stress axis are mussy and are not controlled by regional principal compressive stress.This state implies that the complex focal mechanisms may be correlated with the complex seismogenic mechanisms of the induced earthquake.
引文
1李胜乐,等.长江三峡水库蓄水后的首发微震群活动[J].大地测量与地球动力学,2003,23(4):75～79.Li Shengle,et al.First microquake swarm activity since stor-age in Three Gorges reservoir[J].Journal of Geodesy and Geodynamics,2003,23(4):75-79.(in Chinese)
2薛军蓉,等.三峡水库蓄水初期9次微震震源机制解特征[J].大地测量与地球动力学,2004,24(2):48～51.Xue Junrong,et al.Features of focal mechanism solution of9microquakes after impoundment of Three Gorges reservoir[J].Journal of Geodesy and Geodynamics,2004,24(2):48-51.(in Chinese)
3薛军蓉,等.三峡水库蓄水初期微震震中修订[J].大地测量与地球动力学,2005,25(专):63～66.Xue Junrong,et al.Revising epicenters of microquakes in ini-tial stage of impoundment of Three Gorges reservoir[J].Journal of Geodesy and Geodynamics,2005,25(Spec.):63-66.(in Chinese)
4Yao Yunsheng,et al.Tectonic deformation of the Jianghan-Dongting basin and its surrounding areas from late mesozoic to cenozoic[J].Geotectonica et Metallogenia,2000,24(2):140-145.
5韩晓光,等.长江三峡水库巴东库段地震成因分析[J].大地测量与地球动力学,2004,24(2):74～77.Han Xiaoguang,et al.Analysis of reservoir induced micro quakes at Badong reaches of Three Gorges[J].Journal of Geodesy and Geodynamics,2004,24(2):74-77.(in Chi-nese)
6高士均,等.长江三峡地区地壳应力场与地震[M].北京:地震出版社,1992.Gao Shijun,et al.Crustal stress field and seismic activity in the Three Gorges area[M].Beijing:Seismological Press,1992.(in Chinese)
7李安然,等.峡东工程地震[M].北京:地震出版社,1996.Li Anran,et al.Engineering seismology in the east part of the Three Gorges[M].Beijing:Seismological Press,1996.(in Chinese)
8刘锁旺,等.长江三峡地区的构造应力场与地震活动[J].地震地质,1983,5(1):29～41.Liu Suowang,et al.Tectonic stress field and seismicity in the Three Gorges region on the Changjiang river[J].Seis-mology and Geology,1983,5(1):29-41.(in Chinese)
9陈蜀俊,等.三峡水库蓄水对库区孕震环境及潜在震源影响研究[J].大地测量与地球动力学,2005,25(3):116～120.Chen Shujun,et al.Effect of impounding on seismogenic environment and potential focus in region of Three Gorges reservoir[J].Journal of Geodesy and Geodynamics,2005,25(3):116-120.(in Chinese)
10Zoback M L,et al.State of stress in the conterminous unit-ed states[J].JGR,1980,85:6113-6156.
11杨淑贤,等.三峡及邻区新构造期以来应力场分区研究[J].大地测量与地球动力学,2005,25(4):42～45.Yang Shuxian,et al.Study on stress field zoning in Three Gorges and its adjacent area since neotectonic age[J].Journal of Geodesy and Geodynamics,2005,25(4):42-45.(in Chinese)
12李细光,等.三峡地区现今构造应力场形成机制的深层动力学分析[J].大地测量与地球动力学,2005,25(专):90～95.Li Xiguang,et al.Analysis of deep dynamicsc about forming mechanism of current tectonic stress field in Three Gorges area[J].Journal of Geodesy and Geodynamics,2005,25(Spec.):90-95.(in Chinese)
13杨福平,严尊国.湖北省秭归ML3.6地震震源特征[J].大地测量与地球动力学,2002,22(4):92～96.Yang Fuping and Yan Zunguo.Source characterstics of Zigui(Hubei)earthquake(ML=3.6)[J].Journal of Ge-odesy and Geodynamics,2002,22(4):92-96.(in Chi-nese)
14汪素云,等.中国东部大陆的地震构造应力场[J].地震学报,1985,7(1):17～31.Wang Suyun,et al.seismic stress field in the east of China continent[J].Acta Seismological Sinica,1985,7(1):17-31.(in Chinese)
2薛军蓉,等.三峡水库蓄水初期9次微震震源机制解特征[J].大地测量与地球动力学,2004,24(2):48～51.Xue Junrong,et al.Features of focal mechanism solution of9microquakes after impoundment of Three Gorges reservoir[J].Journal of Geodesy and Geodynamics,2004,24(2):48-51.(in Chinese)
3薛军蓉,等.三峡水库蓄水初期微震震中修订[J].大地测量与地球动力学,2005,25(专):63～66.Xue Junrong,et al.Revising epicenters of microquakes in ini-tial stage of impoundment of Three Gorges reservoir[J].Journal of Geodesy and Geodynamics,2005,25(Spec.):63-66.(in Chinese)
4Yao Yunsheng,et al.Tectonic deformation of the Jianghan-Dongting basin and its surrounding areas from late mesozoic to cenozoic[J].Geotectonica et Metallogenia,2000,24(2):140-145.
5韩晓光,等.长江三峡水库巴东库段地震成因分析[J].大地测量与地球动力学,2004,24(2):74～77.Han Xiaoguang,et al.Analysis of reservoir induced micro quakes at Badong reaches of Three Gorges[J].Journal of Geodesy and Geodynamics,2004,24(2):74-77.(in Chi-nese)
6高士均,等.长江三峡地区地壳应力场与地震[M].北京:地震出版社,1992.Gao Shijun,et al.Crustal stress field and seismic activity in the Three Gorges area[M].Beijing:Seismological Press,1992.(in Chinese)
7李安然,等.峡东工程地震[M].北京:地震出版社,1996.Li Anran,et al.Engineering seismology in the east part of the Three Gorges[M].Beijing:Seismological Press,1996.(in Chinese)
8刘锁旺,等.长江三峡地区的构造应力场与地震活动[J].地震地质,1983,5(1):29～41.Liu Suowang,et al.Tectonic stress field and seismicity in the Three Gorges region on the Changjiang river[J].Seis-mology and Geology,1983,5(1):29-41.(in Chinese)
9陈蜀俊,等.三峡水库蓄水对库区孕震环境及潜在震源影响研究[J].大地测量与地球动力学,2005,25(3):116～120.Chen Shujun,et al.Effect of impounding on seismogenic environment and potential focus in region of Three Gorges reservoir[J].Journal of Geodesy and Geodynamics,2005,25(3):116-120.(in Chinese)
10Zoback M L,et al.State of stress in the conterminous unit-ed states[J].JGR,1980,85:6113-6156.
11杨淑贤,等.三峡及邻区新构造期以来应力场分区研究[J].大地测量与地球动力学,2005,25(4):42～45.Yang Shuxian,et al.Study on stress field zoning in Three Gorges and its adjacent area since neotectonic age[J].Journal of Geodesy and Geodynamics,2005,25(4):42-45.(in Chinese)
12李细光,等.三峡地区现今构造应力场形成机制的深层动力学分析[J].大地测量与地球动力学,2005,25(专):90～95.Li Xiguang,et al.Analysis of deep dynamicsc about forming mechanism of current tectonic stress field in Three Gorges area[J].Journal of Geodesy and Geodynamics,2005,25(Spec.):90-95.(in Chinese)
13杨福平,严尊国.湖北省秭归ML3.6地震震源特征[J].大地测量与地球动力学,2002,22(4):92～96.Yang Fuping and Yan Zunguo.Source characterstics of Zigui(Hubei)earthquake(ML=3.6)[J].Journal of Ge-odesy and Geodynamics,2002,22(4):92-96.(in Chi-nese)
14汪素云,等.中国东部大陆的地震构造应力场[J].地震学报,1985,7(1):17～31.Wang Suyun,et al.seismic stress field in the east of China continent[J].Acta Seismological Sinica,1985,7(1):17-31.(in Chinese)
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