The results show that the fractal reduces before an earthquake and is minimum during earthquake, according to which the criterion of dividing seismic risk is put forward.
结果表明，区域垂直形变场分数维在地震前下降，同震时段降至最低。
The results show that the fractal reduces before an earthquake and is minimum during earthquake, according to which the criterion of dividing seismic risk is put forward.
结果表明，区域垂直形变场分数维在地震前下降，同震时段降至最低。
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