The severity of rockbursts in a mine is measured on a local magnitude scale, with values usually ranging from to , where represents the highest severity.
For one mining site, the annual number, , of rockbursts reaching at least magnitude is modeled by , where . At this site, there are on average rockbursts per year with a magnitude of or greater.
The model is alternatively written as .
The expected return period in years between rockbursts with magnitude at least is .
The largest rockburst ever recorded at this site had magnitude .