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Comprehensive study on the single station seismic anomalies before strong earthquakes——Taking Kashi seismic station as an example

We tried to refine the comprehensive seismic anomaly characteristics of multiple methods before the large earthquakes (M S ≥6.0) in the range of 150 km from the single seismic station. The seismic frequency, b value, seismic gap, η value, small earthquake modulating ratio and seismic danger degree with the epicenter distances of 200 km, 150 km and 100 km were calculated by using the seismic data of the Kashi seismic station. Through analyzing these components, it is found that there are anomalies with various grades on each method before the strong earthquakes, which corresponded to the strong earthquakes with the range of 150 km. However, there is no good respondence to the strong earthquakes with larger epicenter distances. It is also found that the anomalies of multiple methods with the three distance scales have the empirical correlation with the space extent of the coming strong earthquakes.