【摘要】 利用小波分析方法对云南西部地区的多期重力观测资料进行了计算，并将 计算前后的重力结果进行了对比分析，同时讨论了不同阶的小波分解结果的物理意 义及其与地震之间的对应关系．由对应于地壳浅层物质状态变化的一阶小波分解所 得结果显示，在地震前的１９９２～１９９３、１９９３～１９９４、１９９４～１９９５年等多期重力变化中 震源附近都有一定的异常，特别是１９９５～１９９６年的同震变化更加明显。而反映地球 深层物质状态变化的重力二、三阶小波的分解结果虽然对地震过程有一定的响应，但 不是特别明显，这与丽江７．０级地震发生在浅层（深约１０ ｋｍ）是一致的。更多还原

【Abstract】 The gravity variation before and after the Lijiang Ms7.0 earthquake that province occurred in Yunnan in 1996 is calculated by wavelet analysis method and the relationship between different wavelet transformation results and the earthquake is discussed The conclusions are: The first wavelet transformation results reflect the shallow layer material density variation in the earth from 1992 to 199,, from 1993 to 1994 and from 1994 to 1995, and there are anomalous gravity varia- tions near the earthquake area before the earthquake . Especially. the gravity variation is very clear during the earthquake from 1995 to 1996 . Although the second and third wavelet transforma- tion results of gravity variation according with the deep layer material density change of the earth have some variations during the earthquake, they are all not obvious The reason may be that the Lijiang Ms7.0 earthquake occurred in the shallow layer of the earth crust ( 10 km)更多还原