Research on Strong Earthquake Probability Prediction Based on the Probability Gain Model
In order to improve the accuracy of short-and medium-term prediction of strong earthquakes in Yunnan and its adjacent area,through the comparative study of different earthquake precursor indexes before strong earthquake,we find that using only one single indicator is difficult to improve the accuracy of prediction.We select 6 indexes which all reflect the occurrence law of strong earthquakes from different aspects.We use the probability gain model to synthetically process these indicators by estimating the probability gain of each earthquake precursor to quantita-tively determine the possibility of the earthquake.Finally,we obtain a synthetic probability P index to predict the probability of short-and medium-term occurrence of 6-magnitude earthquakes or above in Yunnan and its adjacent area in future.The results show that:①The comprehensive probability P can pass the R-value test for predicting 6-magnitude earthquakes or above in Yunnan and its adjacent area in the next six months.②Taking P abnormal threshold as 20％and 30％,different levels of strong earthquake warning can be carried out,a P-value less than 20％indicates"safety";a P-value greater than 20％indicates that a"yellow warning"is necessary,indicating that there is a possibility of a 6-magnitude earthquake or higher may occur in Yunnan in future;a P-value greater than 30％indicates the need for a"red warning",indicating that a 6-magnitude earthquake or above will occur in Yunnan and its adjacent area in the next six months.
probability gainsynthetic probabilityshort-and medium-term earthquake predictionYunnan and its adjacent area6-magnitude earthquakes or ubove
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