基于GPS速度场的关中地区应变场分析
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摘要
利用2009~2013年GPS速度场数据,计算了关中盆地面膨胀率、主应变率、最大剪应变率,选取并解算了岐山-马召断裂、渭河断裂GPS剖面的应变积累。结果显示:(1)应变场上看,2009~2011周期在关中盆地均以张性运动为主;2011~2013周期发生转折,转为压性。(2)GPS剖面计算结果显示了2011~2013较2009~2011周期,岐山-马召断裂上盘相对下盘以右旋走滑为主,兼顾拉张运动;渭河断裂则在两期数据中走滑与张压特性不明显,呈微弱的张性变化特征。
This article calculated and analyzed the surface expansion rate, the principal strain rate, and the maximum shear strain rate about Guanzhong region with the 2009~2013 GPS velocity field data. And then, the paper selected and solved the strain accumulation of the GPS section of Qishan and Weihe faults. The results show that(1) from the strain field, in the Guanzhong Basin, it shows that the tension movement is the main one from 2009 to 2011, but it turn to the pressure from 2011 to 2013.(2) Compared to the 2009~2011 period, the section results of the 2011~2013 show that taking the right lateral strike slip as the main, taking into account the tension motion from the hanging wall about QishanMazhao fault. The Weihe fault's tension and compression properties are not obvious in the two phases, and show weak tension change characteristic.
This article calculated and analyzed the surface expansion rate, the principal strain rate, and the maximum shear strain rate about Guanzhong region with the 2009~2013 GPS velocity field data. And then, the paper selected and solved the strain accumulation of the GPS section of Qishan and Weihe faults. The results show that(1) from the strain field, in the Guanzhong Basin, it shows that the tension movement is the main one from 2009 to 2011, but it turn to the pressure from 2011 to 2013.(2) Compared to the 2009~2011 period, the section results of the 2011~2013 show that taking the right lateral strike slip as the main, taking into account the tension motion from the hanging wall about QishanMazhao fault. The Weihe fault's tension and compression properties are not obvious in the two phases, and show weak tension change characteristic.
引文
[1]韩许恒.鄂尔多斯地块周缘地震活动周期及迁移特性[J].内陆地震,1992,6(1):71-78
[2]邓起东,程绍平,闵伟,等.鄂尔多斯块体新生代构造活动和动力学的讨论[J].地质力学学报,1999,5(3):13-21
[3]刘明军,樊计昌,韩艳杰,等.鄂尔多斯和塔里木地块运动与中国大陆强震关系探讨[J].地震,2011,31(1):127-134
[4]徐锡伟,程国良,马杏垣,等.华北及其邻区块地转动和动力来源[J].中国地质大学学报,1994,19(2):129-138
[5]李万伦,卢演俦,丁国瑜.鄂尔多斯及其邻近块体相对运动的黄土古地磁证据[J].第四纪研究,2001,21(6):551-559
[6]ZHANG Y Q,MERCIER J L,VERGELY P.Extension in the Graben Systems Around the Ordos(China),and Its Contribution to the Extrusion Tectonics of South China with Respect to Gobi-Mongolia[J].Tectonophysics,1998,285(2):4l-75
[7]马宗晋.地震与断裂关系的讨论,中国活动断裂[M].北京:地震出版社,1982
[8]苏怡之,王进英.汾渭地震带的地震活动性[J].内陆地震,1992,6(2):143-150
[9]雷鹏.鄂尔多斯块体周缘新生代断陷活动动力学成因机制初探[J].西部资源,2016(3):100-105
[2]邓起东,程绍平,闵伟,等.鄂尔多斯块体新生代构造活动和动力学的讨论[J].地质力学学报,1999,5(3):13-21
[3]刘明军,樊计昌,韩艳杰,等.鄂尔多斯和塔里木地块运动与中国大陆强震关系探讨[J].地震,2011,31(1):127-134
[4]徐锡伟,程国良,马杏垣,等.华北及其邻区块地转动和动力来源[J].中国地质大学学报,1994,19(2):129-138
[5]李万伦,卢演俦,丁国瑜.鄂尔多斯及其邻近块体相对运动的黄土古地磁证据[J].第四纪研究,2001,21(6):551-559
[6]ZHANG Y Q,MERCIER J L,VERGELY P.Extension in the Graben Systems Around the Ordos(China),and Its Contribution to the Extrusion Tectonics of South China with Respect to Gobi-Mongolia[J].Tectonophysics,1998,285(2):4l-75
[7]马宗晋.地震与断裂关系的讨论,中国活动断裂[M].北京:地震出版社,1982
[8]苏怡之,王进英.汾渭地震带的地震活动性[J].内陆地震,1992,6(2):143-150
[9]雷鹏.鄂尔多斯块体周缘新生代断陷活动动力学成因机制初探[J].西部资源,2016(3):100-105