上图用红色箭头表示震中附近地面移动的相对方向和大小。
The image above USES red arrows to represent the relative direction and magnitude of the ground movement in the vicinity of the quake.
数值结果表明，地下洞室群对附近地面运动具有显著的放大作用。
It is shown that underground group cavities significantly amplify the surface ground motion nearby.
这个大地洞于2月23日形成，它一直散发出阵阵恶臭。目击者称，地洞出现前，附近地面出现了震动。
The pit opened up on Friday, February 23, emitting foul odours. Witnesses said the ground shook before it appeared.
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