四川九寨沟Ms7.0地震前地电阻率的异常变化

发布时间：2018-05-21 20:29

  本文选题：四川九寨沟地震 + 地电阻率异常　； 参考：《地震工程学报》2017年04期

【摘要】：四川九寨沟7.0级地震前,距离震中360km的平凉井下地电阻率出现了持续1年的趋势异常,NS和EW测项异常幅度年变化率均大于背景值(正常年变化0.6%和0.4%),分别为1.1%、0.6%;2017年6月27—29日中国地震局台网中心、宁夏地震局、甘肃省地震局组成联合异常核实小组,对这组变化进行分析研判,确定是地下介质电性发生了变化,属于震兆异常。在震前20个小时平凉地电NS和EW两个测道日变化率分别为8.9‰、1.5‰,主震结束后,测值基本恢复到背景值。该次变化对地震预测有积极的研究价值。
[Abstract]:Before the earthquake of magnitude 7.0 in Jiuzhaigou, Sichuan, The downhole resistivity of Pingliang downhole from the epicenter of 360km has appeared trend anomaly for one year. The annual variation rate of anomaly amplitude of NS and EW items is greater than that of background value (normal annual variation of 0.6% and 0.40% of 0.40%), which are 1.1% and 0.6%, respectively; from June 27-29, 2017, the station network center of China Seismological Bureau, China Seismological Bureau, Ningxia Seismological Bureau and Gansu Seismological Bureau have formed a joint anomaly verification group to analyze and judge the changes and determine that the electrical properties of underground media have changed and belong to earthquake precursory anomalies. The diurnal variation rates of NS and EW are 8.9 鈥，

本文编号：1920693