Chris;

No problem.

What do you want as output? Separate graph for each quake plus a list of quakes which fit?

You will have quakes counted more than once unless each 30 day period is consecutive and separate. Say I take the first 5+ in the list, extract 30 days quakes, process it. Then go to day 31 and start looking for the first 5+ after that and repeat the process.

Is that what you mean?

Roger