jgg     2014 34 (4):  60-63    ISSN: 0412-1961  CN: 21-1139/TG THE GRAVITY DISTURBANCE SIGNALS BEFORE  YUTIAN Ms7.3 EARTHQUAKE 1）National Earthquake Infrastructure Service，Beijing 100045 2）State Key Laboratory of Geodesy and Earth’s Dynamics，Wuhan 430077 3）Key Laboratory of the Earth’s Deep Interior，CAS，Beijing 100026 Received: 2014-03-30  Revised: null  Online: 2014-07-22 Supporting info