积石山 Ms6.2 、乌什 Ms7.1 地震前后 地电场变化特征研究
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关键词：积石山 Ms6.2 地震；乌什 Ms7.1 地震；地电场；能谱；变化特征中图分类号：P315 文献标志码：A 文章编号：1000-0844（2026）01—0197-08
Variation characteristics of the geoelectric field before and after the Jishishan Ms6.2 and Wushi Ms7.1 earthquakes
FAN Yingying1，2，3，AN Zhanghui1，2，3，WU You1，LIN Yil （1.Lanzhou Institute of Seismology，CEA，Lanzhou 73oooo，Gansu，China ; 2.Lanzhou Base of Institute of Earthquake Forecasting，CEA，Lanzhou 73oooo，Gansu， China ; 3.GansuEarthquakeAgency，Lanzhou73oooo，Gansu，China）
Abstract： Using geoelectric field observation data from stations around the epicenters of the Jishishan Ms6.2 and Wushi Ms7.1 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 Ms6.2 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 Ms7.1 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.
Keywords： Jishishan Ms6.2 earthquake;Wushi Ms7.1 earthquake;geoelectric field;energy spectrum；variation characteristics
0 引言
2023年12月18日23时59分，青藏高原东北缘的甘肃省临夏州积石山县 （35.70∘N，102.79∘E） 发生 Ms6.2 地震，震源深度 10km 。（剩余11863字）
