台湾海峡西岸重力场变化梯度场图像分析

ANALYSIS OF THE GRADIENT FIELD IMAGE OF GRAVITY FIELD VARIATION ON WESTERN SHORE OF TAIWAN STRAIT

讨论了应用曲面拟合技术和利用离散的重力观测点的重力变化对特定研究区的重力场变化进行数值模拟以获取该区重力变化空间梯度场图像的具体方法；并应用该方法获得了2004年3月福建安溪3．6级地震前的重力变化空间梯度场图像，发现空间梯度场图像能清晰地反映出地震前重力场群体性变化的差异性；利用此方法对2005年6月-2006年3月间台湾海峡西岸重力场变化进行数值模拟，获得其空间梯度场图像。

This paper discusses how to invistigate the of the surface fitting method and gain the grad field image gravity variation based on the disperse gravity data by use of studied region. The grad field image of western shore of Taiwan Strait before the Ms3.6 earthquake in Anxi county of Fujian province in March 2004 is obtaioned with this method, the results show that the grad field image can clearly show the difference of gavity variation at the observation points. The gravity variation on the western shore of Taiwan strait from June, 2005 to March, 2006 is numerically simulated, and the grad field image of the gravity variation is obtained.