jgg     2011 31 (2):  23-27    ISSN: 0412-1961  CN: 21-1139/TG RESEARCH ON TEC ANOMALIES BEFORE Ms8.0 WENCHUAN EARTHQUAKE BY USING KALMAN FILTERING Wu Yun1) ;Fu Ningbo2) ; Lin Jian1) ;Zhou Yiyan1) ;Zhu Fuying1) ;Yang Jian1) ; and Xiong Jing1) 1)Institute of Seismology, CEA, Wuhan 4300712)Jiangxi Supervision and Inspection Center for Surveying and Mapping Product Quality, Nanchang 330046 Received: 1900-01-01  Revised: 1900-01-01  Online: null Supporting info null