本文選題：四川九寨溝地震 + 地電阻率異常　； 參考：《地震工程學(xué)報(bào)》2017年04期

【摘要】：四川九寨溝7.0級地震前,距離震中360km的平?jīng)鼍碌仉娮杪食霈F(xiàn)了持續(xù)1年的趨勢異常,NS和EW測項(xiàng)異常幅度年變化率均大于背景值(正常年變化0.6%和0.4%),分別為1.1%、0.6%;2017年6月27—29日中國地震局臺網(wǎng)中心、寧夏地震局、甘肅省地震局組成聯(lián)合異常核實(shí)小組,對這組變化進(jìn)行分析研判,確定是地下介質(zhì)電性發(fā)生了變化,屬于震兆異常。在震前20個(gè)小時(shí)平?jīng)龅仉奛S和EW兩個(gè)測道日變化率分別為8.9‰、1.5‰,主震結(jié)束后,測值基本恢復(fù)到背景值。該次變化對地震預(yù)測有積極的研究價(jià)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，

本文編號：1920693