中文摘要：

利用二维小波分解技术，对青藏高原东北缘1994．1995年、2002～2003年和2011．2012年的相对重力场动态变化进行分解，分析1995-07—22永登Ms5．8级地震、2003-10—25民乐Ms6．1级地震和2012-05—11武威Ms4．9级地震的异常分布情况，研究小波多尺度分解技术在地震预测方面的应用。4阶小波分解结果对3次地震反映明显，重力场动态变化图像中与孕震相关的区域异常在4阶小波细节图震中附近更加突出，证明利用二维小波分解技术可判定地震危险区。

英文摘要：

Dynamic gravity variation in the northeastern margin of Qinghai-Tibet plateau during 1994 - 1995, 2002 -2003 and 2011 - 2012 were decomposed by using multi-scale decomposition technique of discrete wavelet. Based on this result, gravity anomalies were mainly analyzed for Yongdeng Ms5.8 earthquake on Jul. 22,1995 ,Minle Ms6.1 earthquake on Oct. 25,2003 and Wuwei Ms4.9 earthquake on May. 11,2012. The result shows that the three earthquakes are reflected effectively by the 4-order detail. Gravity anomalies near the epicenters are more obvi- ously in 4-order wavelet details, which appear widely in the dynamic patterns of gravity field. The result is significant for determining the potential seismic rick.