1Preface to the special issue on the international workshop on electromagnetic studies of earthquakes and volcanoes in 2016Du Xuebin, Jacques Zlotnicki, Huang Qinghua, Shen Xuhui451-4542Regional characteristics of artificial source geoelectric field spatial variationsMa Qinzhong, Li Wei, Zhao Wenzhou, Zhou Jiangnan, Gong Yao455-4683Inversion of geoelectrical resistivity observed with multi-separation of electrodesMao Xianjin, Yang Lingying, Duan Wei, Zhao Jinmin, Zhuang Ruxin, Qian Jiadong469-4774Experimental studies on the changes of rock resistivity image and anisotropyZhang Bin, Zhu Tao, Zhou Jianguo478-4945Long-term trending variation of georesistivity and its implication to earthquake predictionShen Honghui, Wang Li, Wang Wei, Li Hongyu, Sun Chunxian, Ye Biwen495-5056Georesistivity observational experiment based on encoded sourceGao Shude, Luo Weibin, Su Yonggang, Liang Zibin, Li Xusheng, Han Ying, Sun Haiyang506-5197The finite element modelling of iron interference on earth resistivity of Yanqing stationWang Tongli, Li Yan, Wu Xiaodong, Cui Bowen, Li Juzhen, Wang Lihong520-5308Processing methods for the observation data of georesistivity in earthquake predictionDu Xuebin, Sun Junsong, Chen Junying531-5489Quantitative verification on satellite observational data of ionospheric structure parameters using ground-based dataYan Rui, Wang Lanwei, Hu Zhe, Liu Dapeng549-55710Application of polarization method to geomagnetic data from the station ChengduHe Chang, Feng Zhisheng558-56411Diurnal variation of geoelectric field and its tidal response for the stations Xinyi and MalingshanLi Fei, Du Xuebin, Dong Miao565-57812Variation of geoelectric pulse energy spectra on the northeastern margin of Tibet PlateauLiu Jun, Zhang Xin, Du Xuebin, Fan Yingying, Chen Junying579-59213Order parameter analysis of seismicity in natural time domainGao Yue, An Zhanghui, Fan Yingying, Liu Jun, Wang Jianjun593-60314Phase correlation features of geoelectric field diurnal waveforms in multi-orientationXin Jiancun, Tan Dacheng604-61415The time-frequency characteristics of geoelectric storm in Chinese mainlandSun Junsong, Du Xuebin615-63216@@后插1-后插2