"A swarm" of several hundred earthquakes, the strongest measuring a 5.5 magnitude, were centered east of San Diego near Californias border with Mexico on Sunday afternoon but caused little damage, seismologists said. Sundays shaking in Southern Californias Imperial Valley was the most activity recorded there since the 1970s, according to U.S. Geological Survey seismologist Lucy Jones. "We are having a swarm," Jones said. "We expect thousands of events (like this) over several days."
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