用多分量钻孔应变仪资料推算测区附加应变场方向
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摘要
以福建漳州台深井观测资料为例,探讨用多分量钻孔应变仪资料推算测区附加应变场方向。依据观测资料的特征,把动态应变场分解为背景应变场和附加应变场。为了研究附加应变场主应变方向的变化特征,采用"钻孔加衬模型"公式,计算了主应变方向矢量,绘制了矢量轨迹图,结果为顺时针旋转的椭圆。在2010年3月4日台湾高雄6.7级地震前,矢量轨迹图有比正常情况更零乱、离散的现象。
Taking the observation data of Zhangzhou station,Fujian as an example,we determined direction of the additional strain field in observation area from data of multi-component borehole strain-meter.According to the characteristics of observation data,the dynamic strain field can be decomposed into the background strain field and the additional strain field.In order to study the variation characteristics of principal strain directions of the additional strain field,we used the formula of "lined borehole model" to calculate the vectors in principal strain directions.We also drew the vector trajectory diagram,and it is a clockwisely rotating ellipse.There was a phenomenon that the diagrams were more disordered and dispersed than the normal before the Ms 6.7 earthquake occurred in Gaoxiong,Taiwan,on March 4,2010.
Taking the observation data of Zhangzhou station,Fujian as an example,we determined direction of the additional strain field in observation area from data of multi-component borehole strain-meter.According to the characteristics of observation data,the dynamic strain field can be decomposed into the background strain field and the additional strain field.In order to study the variation characteristics of principal strain directions of the additional strain field,we used the formula of "lined borehole model" to calculate the vectors in principal strain directions.We also drew the vector trajectory diagram,and it is a clockwisely rotating ellipse.There was a phenomenon that the diagrams were more disordered and dispersed than the normal before the Ms 6.7 earthquake occurred in Gaoxiong,Taiwan,on March 4,2010.
引文
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2池顺良,等.钻孔应变观测中潮汐因子离散性与各向异性原因探讨——“十五”数字地震观测网络分量钻孔应变仪首批观测资料分析解释[J].地球物理学进展,2007,22(6):1 746-1 753.(Chi Shunliang,et al.Discussion onstrain tidal factor separation and anisotropy——Analysis offirst data of borehole component strainmeter of China’s digit-al seismological observational networks[J].Progress in Geo-physics,2007,22(6):1 746-1 753)
3邱泽华,等.四分量钻孔应变台网汶川地震前的观测应变变化[J].大地测量与地球动力学,2009,(1):1-5.(QiuZehua,et al.Observed strain changes from 4-componentborehole strainmeter network before 2008 Wenchuan earth-quake[J].Journal of Geodesy and Geodynamics,2009,(1):1-5)
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6潘立宙.与地应力测量有关的几个公式的推导和讨论[A].中国地质科学院地质力学研究所,国家地震局地震地质大队.地应力测量的原理和应用[C].北京:地质出版社,1981:163-203.(Pan Lizhou.Derivation and discus-sion of several formulas on ground stress measurement[A].China Geological Academy Geological Mechanics Institute,Seismogeological Brigade of State Seismological Bureau.Principles and applications of ground stress measurement[C].Beijing:Geological Press,1981:163-203)
7朱金芳,等.闽南地区城市活动构造与地震[M].北京:科学出版社,2008.(Zhu Jinfang,et al.Urban active tectoniczones and earthquakes in southern Fujian[M].Beijing:Sci-ence Press,2008)
8蒋骏,等.地震前兆信息处理与软件系统[M].北京:地震出版社,2000.(Jiang Jun,et al.Earthquake precursor infor-mation processing and software systems[M].Beijing:Seis-mological Press,2000)
2池顺良,等.钻孔应变观测中潮汐因子离散性与各向异性原因探讨——“十五”数字地震观测网络分量钻孔应变仪首批观测资料分析解释[J].地球物理学进展,2007,22(6):1 746-1 753.(Chi Shunliang,et al.Discussion onstrain tidal factor separation and anisotropy——Analysis offirst data of borehole component strainmeter of China’s digit-al seismological observational networks[J].Progress in Geo-physics,2007,22(6):1 746-1 753)
3邱泽华,等.四分量钻孔应变台网汶川地震前的观测应变变化[J].大地测量与地球动力学,2009,(1):1-5.(QiuZehua,et al.Observed strain changes from 4-componentborehole strainmeter network before 2008 Wenchuan earth-quake[J].Journal of Geodesy and Geodynamics,2009,(1):1-5)
4蒋靖祥,等.昆仑山口西8.1级地震前库尔勒测区相对应力场变化[J].地震,2003,23(3):89-96.(Jiang Jingx-iang,et al.Relative stress field change of Ku’erle region be-fore 8.1 earthquake in western Kunlun pass[J].Earth-quake,2003,23(3):89-96)
5欧阳祖熙,等.地壳形变深井综合观测技术的新进展[J].国际地震动态,2009,(11):1-13.(Ouyang Zuxi,et al.New progress in multi-component observation of crustal de-formation in deep boreholes[J].Recent Developments inWorld Seismology,2009,(11):1-13)
6潘立宙.与地应力测量有关的几个公式的推导和讨论[A].中国地质科学院地质力学研究所,国家地震局地震地质大队.地应力测量的原理和应用[C].北京:地质出版社,1981:163-203.(Pan Lizhou.Derivation and discus-sion of several formulas on ground stress measurement[A].China Geological Academy Geological Mechanics Institute,Seismogeological Brigade of State Seismological Bureau.Principles and applications of ground stress measurement[C].Beijing:Geological Press,1981:163-203)
7朱金芳,等.闽南地区城市活动构造与地震[M].北京:科学出版社,2008.(Zhu Jinfang,et al.Urban active tectoniczones and earthquakes in southern Fujian[M].Beijing:Sci-ence Press,2008)
8蒋骏,等.地震前兆信息处理与软件系统[M].北京:地震出版社,2000.(Jiang Jun,et al.Earthquake precursor infor-mation processing and software systems[M].Beijing:Seis-mological Press,2000)
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