本文提出了一种用于速度图象重建的层析成象法。
A new kind of tomographic inverse method used in velocity image reconstruction has been put forward in this paper.
本文在获得三维速度图象的同时，还重新确定了该区的129个地震的震源位置。
While reconstructing the 3-d velocity structure, we have carefully relocated hypo-centers of 129 earthquakes in the region.
闪亮的回击以光速的一半速度上行传播，由于它的速度太快，在一张图象中不能捕捉到这一过程。
The bright return stroke travels upward at around half the speed of light, and is too fast to capture in more than one image.
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