1Analysis of the Difference of Time-Frequency Non-Stationary Characteristics of Ground Motion of Selected Seismic Waves Controlled by Response SpectrumLEI Yixin, CHEN Huiguo, YANG Xiaorui1-92Identification of Pb Seismic Phase and Conrad Discontinuity in Hebei AreaWANG Lichan, LI Xueying, CAI Lingling, WANG Ning, ZHAO Yingping10-173Dynamic Change of Stress Field Inverted Using Focal Mechanisms before and after the Zhuolu Ms4.3 EarthquakeSUN Xiaoru, YUE Xiaoyuan, LIU Jincheng, HU Yitao18-244Earthquake Casualties Prediction Based on PCA-GSM-SVMWANG Chenhui, YUAN ying, LIU Lishen, CHEN Kainan, WU Heshuai25-305Response Ability Experiment of Seismic Monitoring Radon MeterHUANG Rengui, ZHAO Ying, XIAO Jian, REN Hongwei, CHENG Deqing, LI Zongxing31-376Dynamic Variation of Gravity Field in the Shanxi Seismic zone of Different DatumJia Yupeng, Sun Junwei, Hao Pengfei, Tan Yujuan, Li Yongjiang, Li Yangyang, Liu Dongyang38-437Backgroud Characteristics of Hyperspectral Gas and Its Application Prospects in Earthquake TracjingDING Zhihua, CUI Yueju, SHENG Yanrui, ZHANG Ziguang44-498Application of New Lightning Early Warning System in Seismic StationsQUAN Jianjun, CHEN Shanhua, LAI Jianshen, ZHENG Yongtong, CHEN Meimei, LIN Huiqing50-559Background Noise Characteristics of Beijing Seismic NetworkHOU Jie, YU Daxin, YE Qingdong, XU Hui, MENG Xian'gang, XU Dongzhuo, ZHANG Haichun56-61,8010Variation Characteristic of Wave Velocity Ratio before and after Hebei Tangshan Ms4.8 Earthquake in 2012LI Dongsheng, WANG Lichan, WANG Ning, CAI Lingling, JIA Jiong, LI Xiaojun62-6611Subway Interference Analysis and Restraint for Georesistivity Observation at Hefei Central Seismological ObservatoryWANG Yikun, HE Kang, LI Junhui, WANG Xiaoli, SUN Hongbo67-7412Analysis of Water Level Step-down Anomaly of Shiquan Well in Shaanxi ProvinceWANG Qiuning, LI Shouguang, ZHAO Xiaomao75-8013Research on the Impact of HVDC to Geoelectric Field Observationin Shaanxi ProvinceLUO Cijian, WANG Qiuning, LI Yuanyuan, WANG Junru, LIU Wei81-88