柯坪断裂东段现今微动态运动监测与研究
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摘要
1997年1月2日~1998年12月31日新疆伽师地震群的发生,使柯坪断裂的滑动速率和运动方向发生了改变。利用MD系列断层仪对柯坪断裂东段的运动特征进行了观测与研究。结果表明,柯坪断裂带东段在伽师地震群前后,垂直滑动速率由0.037mm/a提高到0.069mm/a,水平错动速度由左旋0.033mm/a改变为右旋0.016mm/a;水平运动方向发生了改变,垂直运动强度提高了近一倍;伽师震群发生前后,柯坪断裂东段附近的应力场发生了改变,最大和最小水平应变率的大小虽未变化,但主应变率轴绕顺时针方向旋转了16.7°。
The Jan.2, 1997 to Dec. 31, 1998 Jiashi earthquake swarm has greatly affected the nearby tectonic activity and fault slip behavior. In this paper, the observation data of MD model fault deformation monitoring system was used to calculate slip rate of the eastern segment of the Keping fault since 1994. The observation and calculation results show that both the horizontal and vertical slip rates changed obviously after the Jiashi earthquake swarm. The sense of the horizontal slip rate changed from right-lateral strike-slip before it to left-lateral slip after it, and the vertical slip rate was 2 times faster than the old one. The horizontal slip rate was 0.033 mm/a in sinistral sense before the Jiashi earthquake swarm, and 0.016 mm/a in dextral sense after it. The vertical slip rate increased from 0.037 mm/a before it to 0.069 mm/a after it. The stress field also changed after Jiashi earthquake swarm. Although the magnitude of strain rate here remained unchanged, the direction of the principle strain rate rotated 16.7° clockwise.
The Jan.2, 1997 to Dec. 31, 1998 Jiashi earthquake swarm has greatly affected the nearby tectonic activity and fault slip behavior. In this paper, the observation data of MD model fault deformation monitoring system was used to calculate slip rate of the eastern segment of the Keping fault since 1994. The observation and calculation results show that both the horizontal and vertical slip rates changed obviously after the Jiashi earthquake swarm. The sense of the horizontal slip rate changed from right-lateral strike-slip before it to left-lateral slip after it, and the vertical slip rate was 2 times faster than the old one. The horizontal slip rate was 0.033 mm/a in sinistral sense before the Jiashi earthquake swarm, and 0.016 mm/a in dextral sense after it. The vertical slip rate increased from 0.037 mm/a before it to 0.069 mm/a after it. The stress field also changed after Jiashi earthquake swarm. Although the magnitude of strain rate here remained unchanged, the direction of the principle strain rate rotated 16.7° clockwise.
引文
[1]中国地震局地质研究所,中国地震局地球物理勘探中心,新疆维吾尔自治区地震局.2005.新疆巴楚-伽师及其邻区中强震发震构造综合科学考察报告。
[1]新疆地震局科技监测处.1996.MD系列仪器在新疆地震台网中的应用.(验收鉴定文件)
崔效峰.2006.伽师及周围地区现代构造应力场特征研究.地震学报,28(4):347356.[Cui Xiao feng,2006.Characteristics of recent tectonics stress field inJiashi,Xinjiang and adjacent regions.Acta Seismologica Sinica,28(4):347356.(in Chinese)〗
高国英,温和平,聂晓红.2005.1991～2002年新疆中强震震源机制解分析.地震,25(1):8187.[Gao Guoying,Wen Heping,Nie Xiaohong.2005.Focal-mechanisminterpretation of moderate-strong earthquakes in Xinjiang from1991to2002.Earthquake,25(1):8187.(in Chinese)〗
Holt W E,Chamot-Rooke N,Pichon Le,et al.2000.velocity field inAsia inferred from Quaternary fault slip rates and global positioningsystem observation.Journal Geophy.Res.,105(B8):1918519209.
荆燕,任金卫,王辉.2005a.用活断层资料分析中国大陆及其邻区晚更新世以来的构造应变特征.地震研究,28(4):353358.[Jing Yan,Ren Jinwei,Wang Hui.2005a.Tectonic deformation ofChina continent and its adjacent regions since Late Pleistoceneinferred from active fault movement data,Journal ofSeismologicalResearch,28(4):353358.(in Chinese)〗
荆燕,赵营海,张鸿旭,等.2005b.独山子-安集海断裂单基线双分量斜跨断层监测研究.地震研究,28(2):185188.[Jing Yan,Zhao Yinghai,Zhang Hongxu.et al.2005b.Monitoring ofDushanzi-Anjihai fault with single-baseline,two-component,obliquely-crossing-fault instruments.Journal of SeismologicalResearch,28(2):185188.(in Chinese)〗
李杰,马玉香.2001.MD数字化断层形变测量仪资料的应用分析.地壳形变与地震,21(4):95102.[Li Jie,Ma Yuxiang.2001.Practical analysis of data measured with MDdigital across fault deformation meter.Crustal Deformation andEarthquake,21(4):95102.(in Chinese)〗
李莹甄,曲延军.2000.伽师强震群活动期间地震窗异常特征研究.西北地震学报,22(4):368375.[Li Yingzhen,Qu Yanjun.2000.On characteristics of seismic windowanomaly during the Jiashi earthquake swarm,NorthwesternSeismological Journal,22(4):368375.(in Chinese)〗
沈军,陈建波,王翠,等.2006.2003年2月24日新疆巴楚-伽师6.8级地震发震构造.地震地质,28(2):205211.[Shen Jun,Chen Jian-bo,Wang Cui,et al.2006.Tectonic Backgroundof the Ms6.8earthquake at Bachu-Jiashi on Feb.24,2003.Seismology and Geology,28(2):205211.(in Chinese)〗
王筱荣,孙甲宁,王季达.2005.1997-2003年新疆伽师地震序列时空分布研究.内陆地震,19(2):113121[Wang Xiaorong,Sun Jianing,Wang Jida.2005.Research of the timeand space distribution for the Jiashi earthquake sequence inXingjiang from1997to2003.Inland Earthquake,19(2):113121.(in Chinese)〗
尹光华,蒋靖祥,穆桂金.2003.2003年2月24日巴楚一伽师6.8级地震的构造背景初探.干旱区地理,26(2):103109.[Yin Guanghua,Jiang Jingxiang,Mu Guijin.2003.Tectonic Backgroundof the Ms6.8Earthquake at Bachu-Jiashi on Feb.24.Arid Landand Geography,26(2):103109.(in Chinese)〗
张红艳.2006.新疆地区现代构造应力场非均匀性及成因机理分析[硕士学位论文],北京:中国地震局地壳应力研究所.[Zhang Hongyan.2006.Research on heterogeneity and dynamic genesisof the present tectonic stress field in Xinjiang Area.Master ThesisBeijing:Institute of Crustal Dynamics,CEA(in Chinese)〗
张培震,王琪,马宗晋.2002.中国大陆现今构造运动的GPS速度场与活动地块.地学前缘,9(2):430441.[Zhang Peizhen,Wang Qi,Ma Zongjin.2002.GPS velocity field andactive crustal blocks of contemporary tectonic deformation incontinental China,Earth Sience Frontiers,9(2):430441.(inChinese with English abstract)〗
周仕勇,许忠淮,陈晓非.2001.伽师强震群震源特征及震源机制力学成因分析.地球物理学报,44(5):654662.[Zhou Shiyong,Xu Zhonghuai,Chen Xiaofei.2001.Analysis on thesource characters of the1997Jiashi Swarm,western China.ChineseJournal ofPhysics,44(5):654662.(in Chinese with Englishabstract)〗
许忠淮,汪素云,黄雨蕊,等.1989.由大量地震资料推断的我国大特构造应力场.地球物理学报,32(6):637647.[Xu Zhonghuai,Wang SuYun,Huang Yurui,et al.1989.The tectonicstress field of Chinese continent deduced from a great number ofearthquakes.Chinese Journal ofPhysics,32(6):637647.(inChinese with English abstract)〗
[1]新疆地震局科技监测处.1996.MD系列仪器在新疆地震台网中的应用.(验收鉴定文件)
崔效峰.2006.伽师及周围地区现代构造应力场特征研究.地震学报,28(4):347356.[Cui Xiao feng,2006.Characteristics of recent tectonics stress field inJiashi,Xinjiang and adjacent regions.Acta Seismologica Sinica,28(4):347356.(in Chinese)〗
高国英,温和平,聂晓红.2005.1991～2002年新疆中强震震源机制解分析.地震,25(1):8187.[Gao Guoying,Wen Heping,Nie Xiaohong.2005.Focal-mechanisminterpretation of moderate-strong earthquakes in Xinjiang from1991to2002.Earthquake,25(1):8187.(in Chinese)〗
Holt W E,Chamot-Rooke N,Pichon Le,et al.2000.velocity field inAsia inferred from Quaternary fault slip rates and global positioningsystem observation.Journal Geophy.Res.,105(B8):1918519209.
荆燕,任金卫,王辉.2005a.用活断层资料分析中国大陆及其邻区晚更新世以来的构造应变特征.地震研究,28(4):353358.[Jing Yan,Ren Jinwei,Wang Hui.2005a.Tectonic deformation ofChina continent and its adjacent regions since Late Pleistoceneinferred from active fault movement data,Journal ofSeismologicalResearch,28(4):353358.(in Chinese)〗
荆燕,赵营海,张鸿旭,等.2005b.独山子-安集海断裂单基线双分量斜跨断层监测研究.地震研究,28(2):185188.[Jing Yan,Zhao Yinghai,Zhang Hongxu.et al.2005b.Monitoring ofDushanzi-Anjihai fault with single-baseline,two-component,obliquely-crossing-fault instruments.Journal of SeismologicalResearch,28(2):185188.(in Chinese)〗
李杰,马玉香.2001.MD数字化断层形变测量仪资料的应用分析.地壳形变与地震,21(4):95102.[Li Jie,Ma Yuxiang.2001.Practical analysis of data measured with MDdigital across fault deformation meter.Crustal Deformation andEarthquake,21(4):95102.(in Chinese)〗
李莹甄,曲延军.2000.伽师强震群活动期间地震窗异常特征研究.西北地震学报,22(4):368375.[Li Yingzhen,Qu Yanjun.2000.On characteristics of seismic windowanomaly during the Jiashi earthquake swarm,NorthwesternSeismological Journal,22(4):368375.(in Chinese)〗
沈军,陈建波,王翠,等.2006.2003年2月24日新疆巴楚-伽师6.8级地震发震构造.地震地质,28(2):205211.[Shen Jun,Chen Jian-bo,Wang Cui,et al.2006.Tectonic Backgroundof the Ms6.8earthquake at Bachu-Jiashi on Feb.24,2003.Seismology and Geology,28(2):205211.(in Chinese)〗
王筱荣,孙甲宁,王季达.2005.1997-2003年新疆伽师地震序列时空分布研究.内陆地震,19(2):113121[Wang Xiaorong,Sun Jianing,Wang Jida.2005.Research of the timeand space distribution for the Jiashi earthquake sequence inXingjiang from1997to2003.Inland Earthquake,19(2):113121.(in Chinese)〗
尹光华,蒋靖祥,穆桂金.2003.2003年2月24日巴楚一伽师6.8级地震的构造背景初探.干旱区地理,26(2):103109.[Yin Guanghua,Jiang Jingxiang,Mu Guijin.2003.Tectonic Backgroundof the Ms6.8Earthquake at Bachu-Jiashi on Feb.24.Arid Landand Geography,26(2):103109.(in Chinese)〗
张红艳.2006.新疆地区现代构造应力场非均匀性及成因机理分析[硕士学位论文],北京:中国地震局地壳应力研究所.[Zhang Hongyan.2006.Research on heterogeneity and dynamic genesisof the present tectonic stress field in Xinjiang Area.Master ThesisBeijing:Institute of Crustal Dynamics,CEA(in Chinese)〗
张培震,王琪,马宗晋.2002.中国大陆现今构造运动的GPS速度场与活动地块.地学前缘,9(2):430441.[Zhang Peizhen,Wang Qi,Ma Zongjin.2002.GPS velocity field andactive crustal blocks of contemporary tectonic deformation incontinental China,Earth Sience Frontiers,9(2):430441.(inChinese with English abstract)〗
周仕勇,许忠淮,陈晓非.2001.伽师强震群震源特征及震源机制力学成因分析.地球物理学报,44(5):654662.[Zhou Shiyong,Xu Zhonghuai,Chen Xiaofei.2001.Analysis on thesource characters of the1997Jiashi Swarm,western China.ChineseJournal ofPhysics,44(5):654662.(in Chinese with Englishabstract)〗
许忠淮,汪素云,黄雨蕊,等.1989.由大量地震资料推断的我国大特构造应力场.地球物理学报,32(6):637647.[Xu Zhonghuai,Wang SuYun,Huang Yurui,et al.1989.The tectonicstress field of Chinese continent deduced from a great number ofearthquakes.Chinese Journal ofPhysics,32(6):637647.(inChinese with English abstract)〗
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