Loess is distributed widely in China and the seismic subsidence is one of the major disasters in loess areas.
黄土在我国广泛分布，黄土的震陷性是黄土地区的主要灾害之一。
Thus, in order to prevent seismic subsidence hazard, we need to make risk prediction for seismic subsidence of loess area.
从而，为了预防地震震陷灾害，我们需要对黄土地区的震陷进行危险性预测。
Historically, there are such seismic subsidence examples which magnitudes are not large but seismic subsidence of loess extremely large.
在历史上，也有过震级不大，但极震区产生的黄土震陷量很大的震害实例。
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