Analysis on earthquake precursory anomalies based on two direction S-rough sets

To determine the main precursory anomalies from intricate earthquake precursors in given area is the important content of earthquake consultation. Based on the dynamic transfer characteristic of elements in S-rough sets theory, and the regional difference and precursory difference of earthquake precursory anomalies, an analytical algorithm of earthquake precursory anomalies based on two direction S-rough sets was proposed, which algorithm can determine the main observation items of earthquake precursory anomalies in given area, it also offers a reliable method for seismologists to estimate future earthquake situation correctly.