2003—2008年新疆区域构造应力场特征探讨
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摘要
给出了2003—2008年新疆74次MS≥4.5地震的震源机制解。分析了该期间震源机制反映出的新疆区域应力场特征,并结合1990—2008年的地震活动图像和区域应力场进行了讨论。结果认为:1990—2003年与2004—2008年新疆MS≥5地震活动空间分布图像存在较大的差异性;震源机制得到的主压应力P轴方位为NNW向,与新疆近SN向的背景应力场和作者前期给出的NNE向结果略有差异,反映出不同时期新疆大区域应力场的变化特点;中强地震震源机制主压应力P轴仰角的大小变化与新疆地震活动的强弱相关性明显。
The paper presents the focal mechanism solutions of 74 earthquakes with MS≥4.5 from 2003 to 2008 in Xinjiang and analyzes the regional stress field characteristics reflected by these focal mechanism solutions in Xinjiang in this period.Then,discussion has been made combining with the seismicity image and regional stress field from 1990 to 2008.The result shows that,spatial seismic activity patterns of earthquakes with MS≥5 in Xinjiang are quite different between 1990-2003 and 2004-2008.The seismic activity of mid-strong earthquakes or larger from 1990 to 2003 concentrated in the Aletai seismic belt,the eastern Tianshan mountains and the Arjin-Kunlun mountains tectonic belt.During this period,there occurred respectively the MS7.3 Zaisang earthquake in June,1990,the MS7.8 Mani earthquake in 1997,the MS8.1 west of Kunlun mountain pass earthquake in 2001and the MS7.9 earthquake in the border area between China,Russia and Mongolia in 2003.Since 2004,the seismic activity of mid-strong earthquakes showed a trend of decreasing towards west in Xinjiang.The azimuth of the principal compression stress P axis of focal mechanism solutions is NNW,which is slightly different from the background stress field of near SN and the earlier result of NNE obtained by the author.It reflects the changing characteristic of the large-scale regional stress field in different times in Xinjiang.The inversion result of three regional stress fields reveals some difference in space.The middle area of Tianshan mountains is obviously under the stress field of NNW direction;In the west of South Tianshan mountains-Wuqia and Hetian area and its surroundings,the principal compression stress has the characteristic of NE.The change of elevation angles of the principal compression stress P axis in the focal mechanism solutions of mid-strong earthquakes is obviously related with the strong and weak seismic activities in Xinjiang.
The paper presents the focal mechanism solutions of 74 earthquakes with MS≥4.5 from 2003 to 2008 in Xinjiang and analyzes the regional stress field characteristics reflected by these focal mechanism solutions in Xinjiang in this period.Then,discussion has been made combining with the seismicity image and regional stress field from 1990 to 2008.The result shows that,spatial seismic activity patterns of earthquakes with MS≥5 in Xinjiang are quite different between 1990-2003 and 2004-2008.The seismic activity of mid-strong earthquakes or larger from 1990 to 2003 concentrated in the Aletai seismic belt,the eastern Tianshan mountains and the Arjin-Kunlun mountains tectonic belt.During this period,there occurred respectively the MS7.3 Zaisang earthquake in June,1990,the MS7.8 Mani earthquake in 1997,the MS8.1 west of Kunlun mountain pass earthquake in 2001and the MS7.9 earthquake in the border area between China,Russia and Mongolia in 2003.Since 2004,the seismic activity of mid-strong earthquakes showed a trend of decreasing towards west in Xinjiang.The azimuth of the principal compression stress P axis of focal mechanism solutions is NNW,which is slightly different from the background stress field of near SN and the earlier result of NNE obtained by the author.It reflects the changing characteristic of the large-scale regional stress field in different times in Xinjiang.The inversion result of three regional stress fields reveals some difference in space.The middle area of Tianshan mountains is obviously under the stress field of NNW direction;In the west of South Tianshan mountains-Wuqia and Hetian area and its surroundings,the principal compression stress has the characteristic of NE.The change of elevation angles of the principal compression stress P axis in the focal mechanism solutions of mid-strong earthquakes is obviously related with the strong and weak seismic activities in Xinjiang.
引文
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龙海英,高国英,聂晓红,等.2008.北天山地区中强地震震源机制解分析[J].中国地震,24(1):23—30.LONG Hai-ying,GAO Guo-ying,NIE Xiao-hong,et al.2008.Focal mechanism solution and stress field inversion ofmoderately strong earthquake in the northern Tianshan area[J].Earthquake Research in China,24(1):23—30(in Chinese).
马文涛,徐锡伟,曹忠权,等.2008.震源机制解分类与川滇及邻近地区最新变形特征[J].地震地质,30(4):926—934.MA Wen-tao,XUXi-wei,CAO Zhong-quan,et al.2008.Classification of focal mechanism solutions and characteristicsof latest crustal deformation of Sichuan-Yunnan region and its adjacency[J].Seismology and Geology,30(4):926—934(in Chinese).
梅世蓉,薛艳,宋治平.2009.汶川8.0级与昆仑山口西8.1级地震前地震活动异常特征与启示[J].地震,29(1):1—14.MEI Shi-rong,XUE Yan,SONG Zhi-ping.2009.Anomalous seismic characteristics before WenchuanM8.0and Kun-lunshanM8.1earthquakes and their implications[J].Earthquake,29(1):1—14(in Chinese).
王盛泽,高国英.1992.新疆及邻近地区现代构造应力场的区域特征[J].地震学报,14(增刊):612—620.WANG Sheng-ze,GAO Guo-ying.1992.Regional characteristics of modern tectonic stress field in Xinjiang and its sur-rounding areas[J].Acta Seismologica Sinica,14(Suppl):612—620(in Chinese).
汪素云,高阿甲,许忠淮.1993.中国及邻区地震震源机制特征[A].见:国家地震局震害防御司编.中国地震区划文集.北京:地震出版社.10—26.WANG Su-yun,GAO A-jia,XU Zhong-huai.1993.Characteristics of focal mechanisms of earthquakes in China and itsvicinity[A].In:Department of Earthquake Hazard Prevention,SSB(ed).ACollection of Papers on Seismic Zon-ing of China.Seismological Press,Beijing.10—26(in Chinese).
王晓强,李杰,Zubovich D A,等.2007.利用GPS形变资料研究天山及邻近地区地壳水平位移与应变特征[J].地震学报,29(1):32—36.WANG Xiao-qiang,LI Jie,Zubavich D A,et al.2007.Horizntal movement and strain characteristics in Tianshan andits adjacent region with GPS deformation data[J].Acta Seismologica Sinica,29(1):32—36(in Chinese).
谢富仁,崔效锋,赵建涛,等.2004.中国大陆及邻区现代构造应力场分区[J].地球物理学报,47(4):654—662.XIE Fu-ren,CUI Xiao-feng,ZHAO Jian-tao,et al.2004.Regional division of the recent tectonic stress field in Chinaand its adjacent areas[J].Chinese J Geophys,47(4):654—662(in Chinese).
许忠淮,汪素云,黄雨蕊,等.1989.由大量的地震资料推断的中国大陆构造应力场[J].地球物理学报,32(6):636—647.XU Zhong-huai,WANG Su-yun,HUANG Yu-rui,et al.1989.The tectonic stress field of Chinese continent deducedfrom a great number of earthquakes[J].Chinese J Geophys,32(6):636—647(in Chinese).
高国英,王海涛,聂晓红,等.2007.新疆伽师及周围构造应力场区域特征探讨[J].地震地质,29(1):77—87.GAO Guo-ying,WANG Hai-tao,NIE Xiao-hong,et al.2007.The research on regional characteristics of tectonic stressfield in Jiashi,Xinjiang and its surrounding areas[J].Seismology and Geology,29(1):77—87(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[J].地震,25(1):81—87.GAO Guo-ying,WEN He-ping,NIE Xiao-hong.2005.Analysis of focal mechanism solution of moderately strong earth-quakes in Xinjiang from1991to2002[J].Earthquake,25(1):81—87(in Chinese).
阚荣举,张四昌,晏凤桐,等.1977.中国西南地区现代构造应力场与现代构造活动特征的探讨[J].地球物理学报,20(2):96—108.KAN Rong-ju,ZHANG Si-chang,YAN Feng-tong,et al.1977.Discussion of modern tectonic stress field and tectonicactivity characteristics in southwest area of China[J].Chinese J Geophys,20(2):96—108(in Chinese).
刘蒲雄,陈兆恩.1997.大震前地震活动图像演变及中期向短期过渡的地震活动性标志[J].地震,17(2):113—125.LIU Pu-xiong,CHENZhao-en.1997.Earthquake activity image evolvement and earthquake activity symbol of the tran-sition from mid-term to short term before big earthquakes[J].Earthquake,17(2):113—125(in Chinese).
龙海英,高国英,聂晓红,等.2008.北天山地区中强地震震源机制解分析[J].中国地震,24(1):23—30.LONG Hai-ying,GAO Guo-ying,NIE Xiao-hong,et al.2008.Focal mechanism solution and stress field inversion ofmoderately strong earthquake in the northern Tianshan area[J].Earthquake Research in China,24(1):23—30(in Chinese).
马文涛,徐锡伟,曹忠权,等.2008.震源机制解分类与川滇及邻近地区最新变形特征[J].地震地质,30(4):926—934.MA Wen-tao,XUXi-wei,CAO Zhong-quan,et al.2008.Classification of focal mechanism solutions and characteristicsof latest crustal deformation of Sichuan-Yunnan region and its adjacency[J].Seismology and Geology,30(4):926—934(in Chinese).
梅世蓉,薛艳,宋治平.2009.汶川8.0级与昆仑山口西8.1级地震前地震活动异常特征与启示[J].地震,29(1):1—14.MEI Shi-rong,XUE Yan,SONG Zhi-ping.2009.Anomalous seismic characteristics before WenchuanM8.0and Kun-lunshanM8.1earthquakes and their implications[J].Earthquake,29(1):1—14(in Chinese).
王盛泽,高国英.1992.新疆及邻近地区现代构造应力场的区域特征[J].地震学报,14(增刊):612—620.WANG Sheng-ze,GAO Guo-ying.1992.Regional characteristics of modern tectonic stress field in Xinjiang and its sur-rounding areas[J].Acta Seismologica Sinica,14(Suppl):612—620(in Chinese).
汪素云,高阿甲,许忠淮.1993.中国及邻区地震震源机制特征[A].见:国家地震局震害防御司编.中国地震区划文集.北京:地震出版社.10—26.WANG Su-yun,GAO A-jia,XU Zhong-huai.1993.Characteristics of focal mechanisms of earthquakes in China and itsvicinity[A].In:Department of Earthquake Hazard Prevention,SSB(ed).ACollection of Papers on Seismic Zon-ing of China.Seismological Press,Beijing.10—26(in Chinese).
王晓强,李杰,Zubovich D A,等.2007.利用GPS形变资料研究天山及邻近地区地壳水平位移与应变特征[J].地震学报,29(1):32—36.WANG Xiao-qiang,LI Jie,Zubavich D A,et al.2007.Horizntal movement and strain characteristics in Tianshan andits adjacent region with GPS deformation data[J].Acta Seismologica Sinica,29(1):32—36(in Chinese).
谢富仁,崔效锋,赵建涛,等.2004.中国大陆及邻区现代构造应力场分区[J].地球物理学报,47(4):654—662.XIE Fu-ren,CUI Xiao-feng,ZHAO Jian-tao,et al.2004.Regional division of the recent tectonic stress field in Chinaand its adjacent areas[J].Chinese J Geophys,47(4):654—662(in Chinese).
许忠淮,汪素云,黄雨蕊,等.1989.由大量的地震资料推断的中国大陆构造应力场[J].地球物理学报,32(6):636—647.XU Zhong-huai,WANG Su-yun,HUANG Yu-rui,et al.1989.The tectonic stress field of Chinese continent deducedfrom a great number of earthquakes[J].Chinese J Geophys,32(6):636—647(in Chinese).
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