My gosh. That is a big one. I was in SF in ,89 for the 7.1 and I thought that it was BIG!!! each .1 is 10 times bigger WOW.
God Bless ...
I believe it is 10 times for each whole number increase.
But then I've been sneaking around the web. I found this:
I believe every point is 10 times the energy.