新疆地区现今地壳形变特征与地震活动分析
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摘要
新疆地区GPS区域站1999—2007年、2009—2011年观测资料分析结果表明,该地区水平运动速率分区性明显;2011年6月以来该地区中强地震增强.该文在分析区域站水平运动速率特征的基础上,对2011年1月—2012年3月20个GPS连续观测站基线变化时间序列进行了分析.结果表明,各观测站坐标变化量在2011年4月后整体上变大,新疆地区地壳运动增强,但具体到不同的山区和盆地,基线变化趋势各异.其中,塔里木盆地和准噶尔盆地内部变形相对较小,主要变化发生在天山中南部,出现明显的南北向挤压缩短.
Based on the velocity analysis of GPS regional sites in Xinjiang region during 1999—2007and 2009—2011,the horizontal movement characteristics of the sites are obviously partitioned by the longitude 85°E and latitude 43°N.Since June of 2011,earthquakes become frequent and strong in the region.Analyzing the horizontal motion velocity characteristics,this paper studies the baseline time series from 20continuous GPS stations during January of 2011through March of 2012.The results show that the baseline variations of those stations have become larger from April of 2011,and further show the crustal movement of the Xinjiang has become stronger at the same time.However,in mountains and basins,the trends of baseline changes are different.The trends are relatively small in Tarim and Junggar basins.Whereas,in the central and southern Tianshan,crustal deformation changes prominently and crust shortens sharply due to the north-south compression.
Based on the velocity analysis of GPS regional sites in Xinjiang region during 1999—2007and 2009—2011,the horizontal movement characteristics of the sites are obviously partitioned by the longitude 85°E and latitude 43°N.Since June of 2011,earthquakes become frequent and strong in the region.Analyzing the horizontal motion velocity characteristics,this paper studies the baseline time series from 20continuous GPS stations during January of 2011through March of 2012.The results show that the baseline variations of those stations have become larger from April of 2011,and further show the crustal movement of the Xinjiang has become stronger at the same time.However,in mountains and basins,the trends of baseline changes are different.The trends are relatively small in Tarim and Junggar basins.Whereas,in the central and southern Tianshan,crustal deformation changes prominently and crust shortens sharply due to the north-south compression.
引文
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杨少敏,李杰,王琪.2008.GPS研究天山现今变形与断层活动[J].中国科学:D辑,38(7):872-880.
张风霜,武艳强,孙东颖.2011.中国大陆GPS连续观测站基线时间序列分析[J].地震,31(4):86-97.
张国民,傅征祥,桂燮泰(主编).2001.地震预报概论[M].北京:科学出版社:71-76.
胡亚轩,崔笃信,郝明,秦姗兰,王文萍.2012.和静、新源交界6.6级地震前新疆地区地壳形变特征与地震活动分析[J].大地测量与地球动力学,32(6):17-23.
李杰,王琪,王晓强,王晓强,帕尔哈提,刘代芹,朱治国,蒋靖祥.2012.南天山—帕米尔现代地壳形变特征与应变场分布[J].大地测量与地球动力学,32(1):1-4.
李祥根.2010.中国地震构造运动[M].北京:地震出版社:203-209.
王琪,丁国瑜,乔学军,王晓强,游新兆.2000.天山现今地壳快速缩短与南北地块的相对运动[J].科学通报,45(14):1543-1547.
王伟,杨少敏,赵斌,黄勇,王琪.2012.中国大陆现今地壳运动速度场[J].大地测量与地球动力学,32(6):29-36.
王晓强,李杰,王琪,Alexander Zubovich.2005.天山现今地壳运动的形变场分析[J].大地测量与地球动力学,25(3):63 -68.
王晓强,李杰,Alexander Zubovich,王琪.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):31-37.
杨国华,韩月萍,王敏,马庆尊.2003.中国大陆几个主要地震活动区的水平形变[J].大地测量与地球动力学,23(3):42-49.
杨少敏,李杰,王琪.2008.GPS研究天山现今变形与断层活动[J].中国科学:D辑,38(7):872-880.
张风霜,武艳强,孙东颖.2011.中国大陆GPS连续观测站基线时间序列分析[J].地震,31(4):86-97.
张国民,傅征祥,桂燮泰(主编).2001.地震预报概论[M].北京:科学出版社:71-76.
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