摘要
对宁夏海原小山YRY-4型钻孔应变仪进行实地相对标定后,数据比标定前有明显好转,资料的相关性显著增强,这验证了海原小山钻孔应变观测资料具有较高的可信度。相对标定后的潮汐因子灵敏度明显提高,稳定度明显改善,出现显著的同步变化趋势,相关性明显增强,各元件均有正常背景。对比钻孔应变各元件观测数据变化曲线,在固原ML3.8级与定西ML6.6级地震震前出现的扭曲、转折、恢复现象,是地震前地下应变积累和调整所致,表现出明显震前的短临异常变化。释放能量较小的地震,曲线扭曲、下降、转折的异常变化幅度较小,反之变化较剧烈,但短临异常变化的时间基本在震前10至15天之间。
Haiyuan ningxia hill YRY- 4 field relative borehole strain meter calibration, data has obvious improvement than before calibration, data correlation significantly enhanced, borehole strain observation data to verify the hill has high credibility.Relative calibration after tidal factor to obviously improve the sensitivity, stability, synchronous change trend of significant, correlation enhancement, each element has the normal background.Contrast borehole strain curves of each element observation data, the evalution ML3.8 level and dingxi ML6.6 preceded an earthquake of magnitude of the phenomenon of twist, twist, restore, are caused by underground strain accumulation and adjustment before the earthquake showed obvious changes in the short.Smaller earthquakes release energy, curve distortion, variations in the anomalies of down, turning small, conversely change is severe, but changes in the short time basic between 10 to 15 days before the earthquake.
引文
[1]唐九安,常千军,杜锡武,等.固体潮潮汐因子的空间分布特征与机理[J].地壳形变与地震.1997,17(1).
[2]王勇,杨选辉,刘福生,等.昌平台钻孔应变观测资料的可靠性研究[J].中国地震,2005,21(2).
[3]池顺良,池毅,邓涛,等.从5.12汶川地震前后分量应变仪观测到的应变异常看建设密集应变观测网络的必要性[J],国际地震动态,2009,361:1-12.
[4]易志刚,邱泽华,宋茉.首都圈地区数字化钻孔应变观测资料分析[J].大地测量与地球动力学,2006,26(3).
[5]吴立辛,卫定军,李国斌,等.小波分析方法在宁夏短水准资料分析中的应用[J].地震研究,2007,30(1):49~53.
[6]苏恺之,马鸿钧,李海亮,等.组合式应变观测仪的设计[J].地震研究,2003,26(2):164~171.
[7]赵虎明,田文清,曹文强,等.钻孔应变仪器电源干扰及排除方法[J].山西地震,2005,(S1).
[8]马栋,陈建国.河北倾斜、应变潮汐因子异常指标研究[J].国际地震动态,2009,(4).
[9]邱泽华,唐磊,周龙寿,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.2009,29(1).
[10]邱泽华,石耀霖.地震造成远距离应力阶变的观测实例[J].中国科学2003,33(曾):60-64.
[11]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.
[12]阚宝祥,邱泽华,池顺良.姑咱台四分量钻孔应变观测的实地标定[J].大地测量与地球动力学,2009.29(1):36~40.
[13]吴立辛,李国斌,郭宏斌,等.海原台四分量钻孔应变观测的相对标定及资料应用.[J]地震研究,2010,04.