A new probability density function in earthquake occurrences

Although knowing the time of the occurrence of the earthquakes is vital and helpful, unfortunately it is still unpredictable. by the way there is an urgent need to find a method to foresee this catastrophic event. thereare a lot of methods for forecasting the time of earthquake occurrence. another method for predicting that is to know probability density function of time interval between earthquakes. in this paper a new probabilitydensity function (pdf) for the time interval between earthquakes is found out. the parameters of the pdf will be estimated, and ultimately, the pdf will be tested by the earthquakes data about iran.