CAJ | 학술논문

对2008年汶川8.0级地震前周边远近台站的电阻率异常特征进行了分析.离震中400 km内的郫县、甘孜、冕宁、武都四个台站基本都存在1年以上的中期异常;距震中较远的兰州台和天水台则出现了短临异常变化.总结了我国9次7级以上大震前地电阻率台观测资料,认为电阻率异常形态以负异常为主,在极值附近或转折恢复过程中发生地震.震中附近台站多数有异常,大部分为一年以上中期的变化,年变形态消失;震前能观测到短临变化;一般在极值点附近发震.较远台站部分存在异常;短期和临震异常变化相对增多;在回升过程中或异常恢复后发震.
대2008년문천8.0급지진전주변원근태참적전조솔이상특정진행료분석.리진중400 km내적비현、감자、면저、무도사개태참기본도존재1년이상적중기이상;거진중교원적란주태화천수태칙출현료단림이상변화.총결료아국9차7급이상대진전지전조솔태관측자료,인위전조솔이상형태이부이상위주,재겁치부근혹전절회복과정중발생지진.진중부근태참다수유이상,대부분위일년이상중기적변화,년변형태소실;진전능관측도단림변화;일반재겁치점부근발진.교원태참부분존재이상;단기화림진이상변화상대증다;재회승과정중혹이상회복후발진.
The anomalous change features of resistivity in the monitoring stations, which are loca-ted near or far from the epicenter of Wenchuan M8.0 earthquake in 2008, are analyzed. There were intermediate-term anomalies for more than one year at Pixian, Ganzi, Mianning and Wudu stations which are less than 400 km from the epicenter, and short and imminent-term anomalies even existed at Lanzhou and Tianshui stations which are far from the epicenter. Also the data of electrical resistivity in past several tens years for 9 large earthquakes with M≥7.0 are summa-rized. The result shows that most anomalous resistivity changes before large earthquake are nega-tive and the value curves are decline, earthquake often occur near the position of extremum or in resuming process. The anomalies can be found at most stations near epicenter, lasting for more than one year with annual rariation disappear. The short and imminent-term change can be ob-served also. For far stations, only some have the anomaly, mainly are short and imminent, and e-vent occurs in or after resuming process.