JD: A swarm of earthquakes there in Southern California and there’s talk out there that this may be a preliminary to the big one. What do we know?
DD: When there’s an earthquake when the very ground shakes and shutters that certainly gets people’s attention. This latest result involves a swarm which is just many small earthquakes. These are occurring off the south end of the St. Andreas fault and they’re not doing damage. They have a low Richter scale number but they’re certainly enough to get people’s attention. This happens every so often and this swarm more than 700 small quakes have been measured the last month.