Geologists are keeping an eye on a series of small earthquakes in Oregon, including a small earthquake on Friday, May 24, in the Clatskanie area.
The tremor measured 2.4 magnitude, according to the United States Geological Survey (USGS).
The Oregon Department of Geology and Mineral Industries said the recent quakes are caused by a slow slip event. Geologists said the slow slip events have a cycle of 14-16 months, during which time small earthquake activity typically increases.
In the past 11 days, Oregon has recorded 5 small earthquakes, all below 4 magnitude, at La Grande, Rose Lodge, La Pine and Molalla.
The small slip events are another reason geologists and emergency management officials encourage Columbia County residents and visitors to establish plans for when larger quakes occur. Those plans should include emergency supplies, such as water, medications and an escape plan.
For more details about preparing for earthquakes or other disasters, contract the American Red Cross.
The Tillamook Headlight Herald assisted in this report.