估算走滑断裂平均滑动速率与地震复发间隔的均一滑动方法

THE UNIFORM SLIP METHOD FOR ESTIMATING MEAN SLIP RATE AND EARTHQUAKE RECURRENCE INTERVAL OF STRIKE SLIP FAULT

In this paper,a method,the uniform slip method,estimating average slip rate along surface trace of strike slip fault zone by historical earthquake data is offered.Based on the assumption that cumulative slip at different localities of a fault tends to be equalized with time,uniform slip, d, of each event is estimated through the ratio of equivalent coseismic slip area,u. l, to fault segment length, L, and then the average slip rate of fault is calculted by the ratio of cumulative uniform slip In a time interval t to the interval. Based on the time predictaable and the renewal reccurrence models,this method can be further used to estimate average recurrence interval between earthquakes at the same locality. The author has made a comparison on differences between the method proposed in this paper and the Brune' s method, given formula for caluclating average slip rate, recurrence interval and other related parameters and errors. And also, the author, taking the Xiaojing fault zone in eastern Yunnan as an example, shows the application of the method in this paper and gives estimation results.