江苏体应变观测质量和强震响应能力综合分析
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摘要
跟踪分析了江苏省“九五”期间建设的5套钻孔体应变仪观测资料的完整性、稳定性及观测精度等,利用观测资料分钟值,对2001~2004年发生在台湾地区的强震记录特征进行了研究,结果表明:1)江苏5套体应变仪的观测精度波动较大,受仪器故障、降雨雷击、气压等因素的干扰,观测资料的完整性、稳定性欠佳,各台都存在着不明原因的突跳现象;2)大部分体应变分钟值能清晰地记录到台湾地区6级以上地震,其中南通体应变仪的灵敏性最好;震级越大形变波衰减时间越长,波幅也越大,波形更似尖锐脉冲;3)徐州、溧阳、南通3台以应变仪在部分台湾地震震前十几分钟至数小时,能记录到显著的震前应力异常变化,如果这种变化是震前应力改变的反映,则对于提高地震预警能力和临震预报能力具有重要意义。
We analyzed the integrality,stability and precision of observation of 5 bore-hole body strain metres in Jiangsu province in the period of “The Nineth Five-year-plan”,and studied the characteristics of Taiwan strong earthquake recorded by the five metres from 2001 to 2004 by use of the data minute.The results show as follows:1)The observation precision of 5 bore-hole body srain metres is not stable,the integrality and stability are affected by apparatus trouble,rain,thunder and atmospheric pressure.2)Minute value of most stations reflects clearly the %M%s>6 earthquakes of Taiwan,body trainmetre at Natong station is most sensitive among them.The stronger the vent is,the larger the wave amplitude is and the more the wave shape looks like a spike.3)All of the metres at Xuzhou,Liyang and Nantong stations record clearly strain anomaly before Taiwan earthquake from dozen-minute to several hours.If the change is a can sure response to the stress change before earthquake it will has the very important significance for improving the abilities of earthquake beforehand alarm and impending prediction.
We analyzed the integrality,stability and precision of observation of 5 bore-hole body strain metres in Jiangsu province in the period of “The Nineth Five-year-plan”,and studied the characteristics of Taiwan strong earthquake recorded by the five metres from 2001 to 2004 by use of the data minute.The results show as follows:1)The observation precision of 5 bore-hole body srain metres is not stable,the integrality and stability are affected by apparatus trouble,rain,thunder and atmospheric pressure.2)Minute value of most stations reflects clearly the %M%s>6 earthquakes of Taiwan,body trainmetre at Natong station is most sensitive among them.The stronger the vent is,the larger the wave amplitude is and the more the wave shape looks like a spike.3)All of the metres at Xuzhou,Liyang and Nantong stations record clearly strain anomaly before Taiwan earthquake from dozen-minute to several hours.If the change is a can sure response to the stress change before earthquake it will has the very important significance for improving the abilities of earthquake beforehand alarm and impending prediction.
引文
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7 陈德福,苏恺之,等.地震地形变观测技术[M].北京:地震出版社,1995,297~307.7 Chen Defu,Su Kaizhi,et al.Observation techniques of seismic crustal deformation[M].Beijing:Seismological Press,1995,297-307.(in Chinese)
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2 陈德福,等.倾斜异常图像分类及其特征浅析[J].地震学报,1986,8(2):211~225.2 Chen Defu,et al.Preli minary opinion onthe features and classification of anomaly patterns of crustal tilt[J].Acta Seismologica Sinica,1986,8(2):211-225.(in Chinese)
3 李占录,苏树朋,等.昆仑山口西8.1级地震易县台潮汐形变图像浅析[J].大地测量与地球动力学,2004,24(4):82~84.3 Li Zhanlu,Su Shupeng,et al.Preli minary Analysis of tidal deformation at Yixian station related to western Kunlun mountainMs8.1earthquake[J].Journal of Ge-odesy and Geodynamics,2004,24(4):82-84.(in Chi-nese)
4 李冬梅,白晓勤,等.山西侯马台记录到的强远震前兆波特征浅析[J].大地测量与地球动力学,2002,22(3):82~84.4 Li Dongmei,Bai Xiaoqin,et al.Analysis of precursor wave characters recorded at Houma station,Shanxi province[J].Journal of Geodesy and Geodynamics,2002,22(3):82-84.(in Chinese)
5 李杰,邹钟毅,等.TJ-Ⅱ型钻孔体应变仪数字化观测资料分析[J].大地测量与地球动力学,2002,22(3):69~74.5 Li Jie,Zou Zhongyi,et al.Analysis of digitized observa-tion of TJ-II bore-hole body strain meters[J].Journal of Geodesy and Geodynamics,2002,22(3):69-74.(in Chinese)
6 郑江蓉,徐桂明,等.2004年12月26日印尼8.7级强震后江苏地区同震效应分析[J].防灾减灾工程学报,2005,25(1):105~113.6 Zheng Jiangrong,Xu Gui ming,et al.Analysis of the co-seismic effects on Jiangsu province of theM8.7Indone-sia,earthquake of Dec.26,2004[J].Journal of Disaster Prevention and Mitigation Engineering,2005,25(1):105-113.(in Chinese)
7 陈德福,苏恺之,等.地震地形变观测技术[M].北京:地震出版社,1995,297~307.7 Chen Defu,Su Kaizhi,et al.Observation techniques of seismic crustal deformation[M].Beijing:Seismological Press,1995,297-307.(in Chinese)
8 牛安福,张晶,等.地壳持续加速变形与地震关系的研究[J].大地测量与地球动力学,2002,22(1):29~33.8 Niu Anfu,Zhang Jing,et al.study onthe continuously ac-celerated deformation and the relationship with earth-quakes[J].Journal of Geodesy and Geodynamics,2002,22(1):29-33.(in Chinese)
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