According to the USGS a magnitude 3.3 earthquake occurred at 8:47pm approximately 4.4 miles east of Marysville, or 11 miles northwest of the Helena Valley.  Eyewitnesses in the area have described a solid, sustained shaking of the ground.  There also have been reports of aftershocks in the area.  
Tune into the news at 10pm for the latest information.
Curtis Grevenitz