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我国自1967年开始地震地电阻率观测以来,至今已有百余个台站了。经历了若干7级以上大震和多次中等强度地震,发现在震中附近的台站记录到不同程度的ρs变化。其中唐山地震发生在京津唐台网之中,就台网的密度、观测质量及资料积累时间来说,相对其它地震的观测网点都是最佳的。因此,本文拟以唐山震例为基础,结合其它震例,讨论7级以上强震在近震中区和远离震中区的ρs异常不同特点及其展布范围;讨论它们与震源破裂长度的关系及其可能的意义;并根据目前观测精度讨论台站对7级以上强震
Since our country began observing the earthquakes in 1967, more than 100 stations have been built so far. After experiencing a number of large earthquakes of magnitude 7 and several moderate-intensity earthquakes, it was found that stations near the epicenter recorded varying degrees of ρs variation. Among them, the Tangshan earthquake occurred in Beijing, Tianjin and Tanggu networks. For the density, observation quality and data accumulation time of Taiwan network, the observation sites are the best compared with other earthquakes. Therefore, based on the Tangshan earthquake example and other seismic cases, the paper discusses the different features and distribution ranges of ρs anomalies in the epicenter area and the epicenter area of moderate earthquakes with magnitude more than 7, and discusses the relationship between them and the source rupture length Its possible significance; and according to the current observation accuracy, discuss the station’s strong earthquakes of magnitude 7 or above