1Preface to the special issue:Study on earthquake related phenomena, their mechanism and observationMa Qinzhong1-32Further study on the anomalies in apparent resistivity in the NE configuration at Chengdu station associated with Wenchuan Ms8.0 earthquakeQian Jiadong, Ma Qinzhong, Li Shaonong4-173Preliminary study on regional geo-resistivity anomaly before the Wenchuan Ms8.0 earthquakeZhu Tao18-254Application of wavelet transform to the analysis of geoelectric field dataLi Wei, Ma Qinzhong, Song Zhiping, Wang Guanyue26-355Hydrogeologic factors of geoelectric field and diurnal computation of preferred orientation of crack water seepageTan Dacheng, Xi Jilou, Zhang Hui, Wang Lanwei, Fan Yingying, An Haijing36-496Analysis on precursory abnormal characteristics of geoelectric field at Changli stationGuo Jianfang, Ma Qinzhong, Tong Xin, Zhou Jianqing, Xue Zhifang, Hu Xiujuan50-607Wavelet power spectrum analysis of the electromagnetic signals of Wenchuan Ms8.0 and Haiti Mw7.0 earthquakesXie Tao, Du Xuebin, Liu Jun, Fan Yingying, An Zhanghui, Chen Junying, Tan Dacheng61-718Anomaly extraction method study and earthquake case analysis based on in-situ plasma parameters of DEMETER satelliteLiu Jing, Huang Jianping, Zhang Xuemin, Shen Xuhui72-839Relation between directional characteristics of resistivity changes and principal stressChen Feng, Ma Maining, An Jinzhen84-9310Research on the observation methods and techniques of omni-directional spontaneous electric fieldXi Jilou, Song Yanru, Hu Mingzhao, Liu Chao, Xu Xuegong, Shang Xianqi94-10711An inspection equipment for electro-magnetic disturbance observation based on DDS techniqueZhang Shizhong, Shi Hang, Wang Lanwei, Hu Zhe, Liu Dapeng, Wei Liansheng, Ju Yong108-11612Test analysis on disturbances caused by urban rail transit at geoelectric stations and measures to reduce its influenceZhang Shizhong, Shi Hang, Wang Lanwei, Hu Zhe, Liu Dapeng, Wei Liansheng, Ju Yong117-12413Research on the eleventh generation IGRFLiu Yuanyuan, Wang Shicheng, Zhang Jinsheng, Zheng Yuhang, Qiao Yukun125-13414Strong earthquake activity all over the world and strong-moderate earthquake activity within and near China (September-October, 2012)Chen Peishan135-136 