【摘要】 利用四川地区2010年8月至2015年3月的流动重力观测数据作出重力场等值线变化图像,研究分析2014年康定M_S6.3级地震前后的重力变化特征,结果表明:(1)三岔口地区长期保持区域性重力正值变化异常及重力变化高梯度带;(2)在康定M_S6.3级地震前后三岔口地区的区域性重力正值变化异常及重力变化高梯度带变化并不是特别显著;(3)在康定M_S6.3级地震前震区重力变化等值线出现四象限区域或者类似于四象限区域的分布特征;(4)康定M_S6.3级地震发震位置处于0值线附近且0值线在此处发生明显的转折、畸变;(5)康定M_S6.3级地震发生在重力减小后回调增加的过程中,震后重力继续回调增加。更多还原

【Abstract】 On the basis of gravity observation data from August 2010 to March 2015 in the Sichuan area,we draw contour variation pictures of gravity field.The pictures have to study the variation characteristics of the gravity field before and after Kangding M_S6.3 earthquake.The result shows :(1) Positive change anomaly of the regional gravity field and high gradient zone of gravity variation are have kept at long-term in the intersection of Xianshuihe fault,Longmenshan fault and Anninghe-Zemuhe faults;(2) Positive change anomaly of the regional gravity field and high gradient zone of gravity variation’s changes weren’t particularly evident before and after Kangding M_S6.3 earthquake in the intersection of Xianshuihe fault,Longmenshan fault and Anninghe-Zemuhe faults;(3) The gravity variation contour was shown as the distribution characteristic of the four quadrant area or similar to the four quadrant area before Kangding M_S6.3 earthquake in the earthquake area;(4) The location of the Kangding M_S6.3 earthquake was in the vicinity of the 0 value line and the 0 value line turned obviously and distorted;(5) The Kangding M_S6.3 earthquake occurred in the course of the increase in the reduction of gravity after the callback and the gravity continued to increase after the earthquake.更多还原