摘要
利用积石山M_(S)6.2地震和乌什M_(S)7.1地震震中周围的地电场台站观测数据,研究地震发生前后地电场能谱值变化。结果表明:(1)在积石山M_(S)6.2地震发生前,武胜驿、松山和平凉等台观测到地电场低频成分能谱值有显著增大的现象;(2)乌什M_(S)7.1地震发生前,乌什、温泉和乌鲁木齐等台均观测到地电场低频成分能谱值先增大后降低的明显变化;(3)初步分析认为,地震前地电场异常现象主要是由于震源孕育过程中激发的低频电磁辐射传播至台站所致。然而,测区地下介质的形变也可能激发局部区域的低频电磁辐射,这一因素同样不容忽视。
Using geoelectric field observation data from stations around the epicenters of the Jishishan M_(S)6.2 and Wushi M_(S)7.1 earthquakes,this study investigates variations in the energy spectral values of the geoelectric field before and after these earthquakes.The results indicate the following:(1)Before the Jishishan M_(S)6.2 earthquake,significant increases in the energy spectral values of the low-frequency components of the geoelectric field were observed at the Wushengyi,Songshan,and Pingliang stations.(2)Before the Wushi M_(S)7.1 earthquake,distinct variations characterized by an initial increase followed by a decrease in the low-frequency energy spectral values were recorded at the Wushi,Wenquan,and Urumqi stations.(3)Preliminary analysis suggests that these observed anomalies were primarily caused by low-frequency electromagnetic radiation generated during focal source preparation and propagation to the stations.However,deformation of subsurface media in the observation areas may also excite low-frequency electromagnetic radiation in local regions—a factor that should not be overlooked.
作者
范莹莹
安张辉
吴优
林毅
FAN Yingying;AN Zhanghui;WU You;LIN Yi(Lanzhou Institute of Seismology,CEA,Lanzhou 730000,Gansu,China;Lanzhou Base of Institute of Earthquake Forecasting,CEA,Lanzhou 730000,Gansu,China;Gansu Earthquake Agency,Lanzhou 730000,Gansu,China)
出处
《地震工程学报》
北大核心
2026年第1期197-204,共8页
China Earthquake Engineering Journal
基金
中国地震局地震预测研究所基本科研业务费专项(2021IESLZ07)
地震科技星火计划(XH24045A)
地震监测预报预警(CEA-JCYJ-202501070)。
