jgg     2009 29 (增刊):  79-83    ISSN: 0412-1961  CN: 21-1139/TG EFFECT OF LEVEL CHANGE OF HUANGBAI RIVER ON GROUND TILT OBSERVATIONS AT YICHANG STATION Yuan Qu 1,2) ;Huang Zhong 1,2) ;Wang Hui 1,2) ;Zhang Hui 1,2) ; and Liu Fu 3) 1) Institute of Seismology，CEA，Wuhan 4300712) Crustal Movement Laboratory，Wuhan 430071 3) Earthquake Group of Sanxia,Yangtze River Water Conservancy Commission，Yichang 443133 Received: 1900-01-01  Revised: 1900-01-01  Online: null Supporting info null