seismic focus

例句：

1. 1.The seismic focus is located at the epicenter of the earthquake.
   地震的震中位于地震的中心。
2. 2. The seismic focus is a critical area for earthquake prediction.
   地震焦点是地震预测的关键区域。
3. 3.The seismic focus is responsible for the movement of the Earth's crust.
   地震焦点负责地球地壳的运动。