Seismological approaches used in earthquake prediction involve many subjects. To predict large earthquakes from small to moderate foreshocks has a clear meaning in physics. Some of the main methods of earthquake predi...Seismological approaches used in earthquake prediction involve many subjects. To predict large earthquakes from small to moderate foreshocks has a clear meaning in physics. Some of the main methods of earthquake prediction used in China are outlined in this paper. According to the anomalies used for earthquake prediction, seismological approaches can be divided into two groups: those that use the anomalies in seismic patterns, including the increase and decrease in regional seismicity, the appearance of seismic gaps, seismic belts, seismic swarms, and foreshocks and those that use anomalies in special values and in seismic waves, such as the anomalies in b values and f values, in the Vp/VS ratio, Q values, stress drop, and shear stress.展开更多
BP neural networks is used to mid-term earthquake prediction in this paper. Some usual prediction parameters of seismology are used as the import units of neural networks. And the export units of neural networks is ca...BP neural networks is used to mid-term earthquake prediction in this paper. Some usual prediction parameters of seismology are used as the import units of neural networks. And the export units of neural networks is called as the character parameter W_0 describing enhancement of seismicity. We applied this method to space scanning of North China. The result shows that the mid-term anomalous zone of W_0-value usually appeared obviously around the future epicenter 1~3 years before earthquake. It is effective to mid-term prediction.展开更多
文摘Seismological approaches used in earthquake prediction involve many subjects. To predict large earthquakes from small to moderate foreshocks has a clear meaning in physics. Some of the main methods of earthquake prediction used in China are outlined in this paper. According to the anomalies used for earthquake prediction, seismological approaches can be divided into two groups: those that use the anomalies in seismic patterns, including the increase and decrease in regional seismicity, the appearance of seismic gaps, seismic belts, seismic swarms, and foreshocks and those that use anomalies in special values and in seismic waves, such as the anomalies in b values and f values, in the Vp/VS ratio, Q values, stress drop, and shear stress.
文摘BP neural networks is used to mid-term earthquake prediction in this paper. Some usual prediction parameters of seismology are used as the import units of neural networks. And the export units of neural networks is called as the character parameter W_0 describing enhancement of seismicity. We applied this method to space scanning of North China. The result shows that the mid-term anomalous zone of W_0-value usually appeared obviously around the future epicenter 1~3 years before earthquake. It is effective to mid-term prediction.
