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对三峡地区的Ｐｇ波非纵观测资料用地震层析成象方法进行了计算处理并对解释结果作了分析。简要阐述了地震层析成象处理方法、地震走时数据的采集与分析等。基底面成象图给出了许多有意义的信息：该测区低速区的形成主要起因于岩性的差异及断层破碎带；基底面上存在３个ｖ＞６４ｋｍ／ｓ的高速度区，面积最大的一个大体呈南北走向，位于黄陵背斜西南侧，向北进入背斜区，另两个分别位于黄陵背斜东侧与测区西侧。据推测，这些高速区是由地壳内高速物质上涌造成的。
The longitudinal observation data of Pg waves in the Three Gorges area are calculated by seismic tomography and the interpretation results are analyzed. The method of seismic tomography, the acquisition and analysis of seismic travel time data, etc. There are many meaningful information about the basal plane image. The formation of low velocity zone in this zone is mainly caused by the difference of lithology and fault fracture zone. There are three high velocity zones with v> 64km / s on the basal plane The largest one is in the north-south direction. It is located on the southwest side of the Huangling anticline, and enters the anticline area to the north. The other two are located respectively on the east side of the Huangling anticline and the west side of the survey area. Presumably, these high-speed zones are caused by the high-velocity material in the crust.