Hi Chris,

I woke up about an hour ago with the usual pain from hip to foot with the sciatic nerve doing its usual painful event. I had a nightmare or morningmare just before I woke up so you'll have to excuse anything I say and chalk it up to "this morning is not perfect" event.

At the risk of sounding totally stupid here, I wondered if a quake was the beginning of the building of a new volcano or an eruption of a volcano would it still fit in your catagory of pairs and triplets for "earthquakes."

For some strange reason I feel that earthquakes related to volcanic events would be separated from earthquakes not related to volcanic events. As an example, not using your list above, let's say these quakes occurred:

LA 6.8
SF 7.2
Seattle 7.1
Hawaii 6.6

How would you classify the quakes? All "just earthquakes" or separate Hawaii and possibly Seattle from LA & SF?

I hope you will play the role of teacher here and provide a lesson to all of us who don't understand if there is or is not a difference between earthquakes in non volcanic area's and earthquakes in volcanic areas.

Thanks for your patience today,

Petra