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应用2013年甘肃岷县漳县M_s6.6地震前263天及震后9天的平凉台观测数据研究了该台地电场在时间域、频率域内的变化,得到:(1)在岷县漳县M_s6.6地震以及在2013年四川芦山M_s7.0地震前平凉台地电场观测记录了显著的自然电场变化,在近距离的岷县漳县地震前自然电场变化更显著,异常变化的持续时间长;(2)平凉台地电场最大熵功率谱密度在4月20日四川芦山地震前发生连续增大的现象,并持续到甘肃岷县漳县地震后。最后讨论了本次地震地电场极低频成分异常变化的机理。
Using the observation data of Pingliangtai Station before 263 days and 9 days after M6.6 Earthquake in Min County, Min County, Gansu Province, the changes of the electric field in time and frequency domain are studied. (1) In Moxian County, Min County, M_s6 .6 earthquakes and the observation of the Pingliang platform electric field before the M_s7.0 Lushan earthquake in 2013 recorded significant changes in the natural electric field. Before the Minxian County in Minhang County, the change of natural electric field was more pronounced and the duration of abnormal changes was longer. 2) The maximum entropy power spectral density of the electric field in Pingliang terraces continued to increase before the Lushan earthquake in Sichuan Province on April 20, and continued until the Zhangxian County earthquake in Min County, Gansu Province. Finally, the mechanism of the abnormal change of the very low frequency component of the electric field in this earthquake is discussed.