三峡重庆地区形变场及构造应力场研究
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摘要
首次利用三峡重庆地区GPS、钻孔应变及数字地震资料,综合研究该地区水平形变场及构造应力场。结果表明,各站点相对丰都龙河站运动速率在0~3mm/a,呈现一定的右旋特征;整个区域表现为压性特征,区域主压应变方向为NW向及NE向;最大剪应变等值线在渝西南、渝东北及与渝东南分别出现高梯度带,与主要地震活动区域相对应。
Using GPS,borehole strain and digital seismic data,we study the horizontal deformation and tectonic stress fields in the Chongqing area.The results show that the inside of the Chongqing region presents relative motion of 0~3 mm/a and presents certain features of the dextral.The region as a whole performs as pressure characteristic.The predominant principal compressive strain direction of the local region is in a NWW direction,the direction of the tectonic stress field direction is consistent,the direction of the part of the region near the impact fracture appears to be a NNE direction,and the maximum shear strain contour line is southwest of Chongqing.Northeast and southeast Chongqing show a high gradient zone,and the gradient belt corresponds to the Chongqing area of the main area of seismic activity.
Using GPS,borehole strain and digital seismic data,we study the horizontal deformation and tectonic stress fields in the Chongqing area.The results show that the inside of the Chongqing region presents relative motion of 0~3 mm/a and presents certain features of the dextral.The region as a whole performs as pressure characteristic.The predominant principal compressive strain direction of the local region is in a NWW direction,the direction of the tectonic stress field direction is consistent,the direction of the part of the region near the impact fracture appears to be a NNE direction,and the maximum shear strain contour line is southwest of Chongqing.Northeast and southeast Chongqing show a high gradient zone,and the gradient belt corresponds to the Chongqing area of the main area of seismic activity.
引文
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[2]瞿伟,张勤,张冬菊,等.基于GPS速度场采用RESLM模型分析青藏块体东北缘的形变-应变特征[J].地球物理学进展,2009,24(1):67-74(Qu Wei,Zhang Qin,Zhang Dongju,et al.Analysis of Deformation Strain Characteristics of the Northeast Margin of Qinghai-Tibet Block Using the RELSM Model Based on the GPS Velocity Field[J].Progress in Geophysics,2009,24(1):67-74)
[3]邱泽华,阚宝祥,唐磊.四分量钻孔应变观测资料的换算和使用[J].地震,2009,29(4):83-89(Qiu Zehua,Kan Baoxiang,Tang Lei.Conversion and Application of 4-Component Borehole Strainmeter Data[J].Earthquake,2009,29(4):83-89)
[4]唐磊,吕品姬.钻孔四分量应变观测数据不同时间尺度的自检分析[J].大地测量与地球动力学,2015,35(3):525-528(Tang Lei,LüPinji.The Self-Test Analysis of 4-Component Borehole Strain Observation Data in Different Time Scales[J].Journal of Geodesy and Geodynamics,2015,35(3):525-528)
[5]邱泽华,石耀霖,欧阳祖熙.四分量钻孔观测的实地相对标定[J].大地测量与地球动力学2005,25(1):118-122(Qiu Zehua,Shi Yaolin,Ouyang Zuxi.Relative Calibration of 4-Component Borehole Strain Observation[J].Journal of Geodesy and Geodynamics,2005,25(1):118-122)
[6]张国红,王勇,杨选辉,等.钻孔应变资料的可靠性分析[J].大地测量与地球动力学,2010,30(增1):62-66(Zhang Guohong,Wang Yong,Yang Xuanhui,et al.Reliability Analysis of Borehole Strainmeter Observations[J].Journal of Geodesy and Geodynamics,2010,30(S1):62-66)
[7]邱泽华,石耀霖,欧阳祖熙.四分量钻孔观测的实地绝对标定[J].地震,2005,25(3):27-34(Qiu Zehua,Shi Yaolin,Ouyang Zuxi.Absolute Calibration of 4-Component Borehole Strainmeters[J].Earthquake,2005,25(3):27-34)
[8]许忠淮,阎明,赵仲和.由多个小地震推断的华北地区构造应力场的方向[J].地震学报,1983,5(3):268-279(Xu Zhonghuai,Yan Ming,Zhao Zhonghe.Evaluation of the Direction of Tectonic Stress in North China from Recorded Data of a Large Number of Small Earthquakes[J].Acta Seismologica Sinica,1983,5(3):268-279)
[9]陈涛,瞿伟,王宏超.三峡重庆库区现今地壳形变特征分析[J].地球物理学进展,2013,28(4):1 795-1 800(Chen Tao,Qu Wei,Wang Hongchao.Analysis on Characteristics of Present-Day Crustal Deformation in Chongqing Area of Three Gorges Reservoir[J].Progress in Geophysics,2013,28(4):1 795-1 800)
[10]丁仁杰,李克昌,吴晓莉,等.重庆地震研究暨重庆1∶50万地震构造图[M].北京:地震出版社,2004(Ding Renjie,Li Kechang,Wu Xiaoli,et al.Earthquake Study in Chongqing and the Seismotectonic Map of Chongqing in Scale 1:500000[M].Beijing:Seismological Press,2004)