江苏体应变观测质量和强震响应能力综合分析

SYNTHETICAL ANALYSIS OF OBSERVATION QUALITY AND RESPONSE ABILITY TO STRONG EARTHQUAKE OF BODY STRAIN METRES OF JIANGSU PROVINCE

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 integrality, stabili metres in Jiangsu province in the period of “The ty and precision of observation of 5 bore-hole body strain 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 Ms〉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.