Magnitude-4.4 quake SAN DIEGO (AP) - A cluster of moderate earthquakes near the U.S.-Mexico border has rattled southern San Diego County as a swarm of seismic activity continues one week after a magnitude-7.2 quake slammed the area. The U.S. Geological Survey says a 04-12-2010 by joemoore Tags charleston, daily, diego, magnitude, mail, others, quake