分量式钻孔应变仪监测的附加应变场面应变分析
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摘要
根据钻孔加衬模型和应变理论,得出分量式钻孔应变仪观测值不等于实际的线应变,但相互垂直的应变元件观测值之和与面应变成正比例。利用四分量钻孔应变仪的"自检"功能,对观测数据进行校正。以漳州地震台分量式钻孔应变仪资料为例,计算校正系数。校正前后的残差分析结果表明,校正效果明显。
According to the lined borehole model and strain theory,we derived that observation value of component-type borehole strain meter is not equal to actual line strain,but sum of observation values of strain sensors laid vertically each other is proportional to the plane strain. The observation data is decomposed into long trend part and part of high frequency tide.Accordingly, the dynamic strain field can be decomposed into a relatively stable background strain field and a real-time changing additional strain field.We make correction for observation data using the "self test" function of 4-component borehole strain meter.The correction coefficients are calculated with data of component-type borehole strain meter at Zhangzhou Seismic Station.Residual analysis before and after correction shows the effect is obvious.
According to the lined borehole model and strain theory,we derived that observation value of component-type borehole strain meter is not equal to actual line strain,but sum of observation values of strain sensors laid vertically each other is proportional to the plane strain. The observation data is decomposed into long trend part and part of high frequency tide.Accordingly, the dynamic strain field can be decomposed into a relatively stable background strain field and a real-time changing additional strain field.We make correction for observation data using the "self test" function of 4-component borehole strain meter.The correction coefficients are calculated with data of component-type borehole strain meter at Zhangzhou Seismic Station.Residual analysis before and after correction shows the effect is obvious.
引文
池顺良,武红岭,骆鸣津.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):1746—1753.
李海亮,马鸿钧,张钧,等.FZY-1型多分量式钻孔应变仪的设计[J].地震地磁观测与研究,2004,25(1):69-77.
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欧阳祖熙,张钧,陈征,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.
潘立宙.与地应力测量有关的几个公式的推导和讨论∥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[M].北京:地质出版社,1981:163-203.
邱泽华,石耀霖,欧阳祖熙.四分量钻孔应变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.
钟继茂,李祖宁,谢志招,等.用多分量钻孔应变仪资料推算测区附加应变场方向[J].大地测量与地球动力学,2011,31(1): 29—33.
朱金芳,谢志招,曲国胜,等.闽南地区城市活动构造与地震[M].北京:科学出版社,2008.
李海亮,马鸿钧,张钧,等.FZY-1型多分量式钻孔应变仪的设计[J].地震地磁观测与研究,2004,25(1):69-77.
欧阳祖熙.RZB-1型电容器式地应变计∥第一届全国地应力会议论文选编[C].北京:地震出版社,1977:337-348.
欧阳祖熙,张钧,陈征,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.
潘立宙.与地应力测量有关的几个公式的推导和讨论∥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[M].北京:地质出版社,1981:163-203.
邱泽华,石耀霖,欧阳祖熙.四分量钻孔应变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.
钟继茂,李祖宁,谢志招,等.用多分量钻孔应变仪资料推算测区附加应变场方向[J].大地测量与地球动力学,2011,31(1): 29—33.
朱金芳,谢志招,曲国胜,等.闽南地区城市活动构造与地震[M].北京:科学出版社,2008.
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