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
Abstract:Analysis of continuous 8 days gravity data of Crustal Movement Observation Network of China (CMONOC)before Yutian Ms7.3 earthquake on Feburary12,2014 indicated that the gravity disturbance signals with the period of 4~8 seconds appeared 6days and 2days before the Earthquake and formed 2 belts.The first one is HegangTaiyuanYinchuanKorla,the second one is WenzhouXiamenXiangfanWanzhou.The phenomenon is significant to comprehensively understanding the disturbance before the earthquake and its mechanism.