Scientists are monitoring a swarm of earthquakes on Mount Hood in the past 24 hours, but there's no cause for alarm, a geophysicist said Monday. The Pacific Northwest Seismic Network and the U.S. Geological Survey websites reported more than five dozen in the Mount Hood Village area as of 5:30 p.m. The approximately 77 minor earthquakes registered less than 2.0 magnitude and began about 6 p.m. Sunday, according to the seismic network website. Most of the tremors are clustered east of Timberline Highway and north of U.S. 35 in Mount Hood Village, an area designated by the U.S. Census that included a population of 4,864 in 2010. Mount Hood has experienced at least 89 earthquakes in 30 days, according to the seismic network. John Vidale, director of the seismic network, said his data indicates the tremors have been occurring along a fault 3 miles deep on the south of the volcano. "Swarms are pretty common around here, and this is probably the biggest one in Hood for a few years," Vidale