Small earthquakes at Newberry Volcano, May 18 2012.

Release Date:

The three May 18 earthquakes would not have been detected prior to last summer, when the Newberry seismic network was expanded from 1 to 9 stations.

According to the Pacific Northwest Seismic Network (PNSN), three shallow Magnitude 0.9-1.0 earthquakes occurred ~20 km NW of Newberry Volcano early on the morning of May 18, 2012. Although these events are nothing to get excited about, they are noteworthy because only 7 earthquakes have been located near Newberry over the last 30 years, including only one within the caldera. The three earthquakes from May 18 occurred in the same vicinity as earthquakes in 1981 (M 1.5), 2004 (M 2.2), and 2005 (M 1.3), all of which were also shallow. The May 18 earthquakes are shown in the below map as red circles.