根据《地震预报管理条例》（1998.12.17），地震预报包括三类型
... 地震预报earthquake forecast 地震长期预报long-term earthquake forecast 地震中期预报intermediate-term earthquake forecast ...
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通过长期监测地下水中水化学成分的变化，就有可能为预测预报地震提供一种新的前兆信息。
Through long-term monitoring of the change of the chemical composition of groundwater, a new kind of premonitory information for earthquake prediction may be provided.
利用此比值常数以及由测震学指标所确定的T_1和求得的T_2可以进行确定性的中长期地震预报。
By means of this ratio and T_1, T_2, determined by seismometry, the mid long-term forecasting of earthquakes can be done.
研究结果表明，运用该模型方法可利用大地测量数据确定沿板块边界断层带的相对闭锁区，从而进行中长期地震预报。
The research result shows that this physical model is useful to determine the locked area along plate boundary faults and further to make the long term and middle term earthquake prediction.
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