M Maybodian - IIEES,tehran , iran
m Zare - IIEES,tehran , iran
h Hamzeloo - IIEES,tehran , iran
a Ansari - IIEES,tehran , iran

the long - term precursory scale increase y phenomenon is used for relating minor seismicity tomajor shallow earthquakes in zagros the y phenomenon involves an increase in the magnitude and rate of occurrence of minor earthquakes in an area near to the location of major event by the modeling of long term seismogenesis as a three -stage faulting process against a background of self-organized criticality the precursory scale increase y phenomenon can be inferred

precursory scale increase, zagros , iran