The swarm has been happening since mid July but picked up noticeably in the last two days, said Ken Smith, the seismic network manager for the Nevada Seismological Laboratory.
Because the population is light, there are fewer earthquake sensors in the area, Smith said. "It is pretty remote and as a result of that, the seismic network is pretty sparse," Smith said. "The earthquakes are hard to locate.
While these kinds of swarms are not unusual in Nevada, this is the first time he's seen one in northern Washoe County. It seems to be caused by normal movement of the tectonic plates that make up the surface of the earth and there's no evidence to suggest a major quake is coming.