RENO, Nev., June 9 (UPI) -- Residents of Reno, Nev., were on guard Monday for earthquake activity after a "swarm" of minor temblors shook the northern part of the state.
The swarm, actually made up of thousands of minor quakes, has been going on for three months but picked up considerably Sunday, shaking shelves and causing tall buildings in downtown Reno to sway, the Reno (Nev.) Gazette-Journal reported, adding there were no reports of significant property damage.
Scientists from the seismology laboratory at the University of Nevada, Reno, told the newspaper that four quakes measuring at least magnitude 3.0 struck the area Sunday morning, capping off a 12-hour period that saw about 20 minor earthquakes. One seismologist said it was the strongest sequence of Nevada quakes in the last month and signaled a pickup in activity.
The current swarm's strongest quake was a magnitude 4.7 temblor that struck Reno April 15, the Gazette-Journal said.