Pinpoint Newsletter - join
A group of friends and amateurs who are interested in earthquakes as well as the cause and effect, whether ideas are based in science or in alternative methods of prediction.
Low activity, 203 members, restricted

sci.geo.earthquakes - join
For discussion of earthquakes and related matters.
Medium activity, 284 subscribers, Usenet

ca.earthquakes - join
What's shakin' in California.
Low activity, 22 subscribers, Usenet