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邢台地震活动地区,地壳底部莫霍界面之下尚有纵波速度为8.1、7.6、7.8和8.1公里/秒的四层介质,它们的下面有速度为7.2—7.4公里/秒的地幔低速层,低速层顶部的深度为83公里左右。 本文所得低速层与世界其他地区所得低速层参数的比较似乎说明:在构造活动地区、火山活动地区和地震活动地区,低速层中的速度值一般均较正常状态下(海洋和大陆地区)的地幔低速层为低,且埋深相对较浅。
In the Xingtai seismic area, there are four layers of media with longitudinal wave velocities of 8.1, 7.6, 7.8 and 8.1 km / s under the Moho interface at the bottom of the crust. Below them are the low-mantle velocity of 7.2-7.4 km / The depth of the top of the layer is about 83 km. The comparison of the low-velocity layer parameters obtained from the low-velocity layer obtained in this paper with those of the rest of the world seems to indicate that in the tectonic activity areas, volcanic activity areas and seismicity areas, the velocities in the low-velocity layers are generally lower than those in normal conditions (oceanic and continental areas) Low velocity layer is low, and the depth is relatively shallow.