PORTLAND (AP) — Oregon state geologists say they’ve been watching a recent swarm of small earthquakes on Mount Hood. KGW-TV reports the quakes started Sunday evening and have been occurring right beneath Government Camp.

Geologists have recorded more than 30 tremors, with the largest a magnitude 2.3, barely big enough to feel. Ian Madin is the chief scientist with the Oregon Department of Geology and Mineral Industries. He’s been tracking the quakes and says they seem to be occurring right alongside a recently discovered fault.