A larger quake could follow within 48 hours but there's a small probability of that happening, according to seismologists.
Several small earthquakes shook an area east of Mount. St. Helens late Tuesday evening and early Wednesday morning.
According to the Pacific Northwest Seismic Network, the largest quake, a magnitude 3.9, hit east of Spirit Lake near Mount Saint Helens just after 12:30 a.m.
A series of smaller quakes, ranging from magnitude 1.6 to magnitude 2.7 stuck shortly after.
