Actually... make that THREE. The second one at 10:44 pm was longer and it was a 4.2. Dunno what the third one was.
http://www.kxly.com/news/north-idaho-news/earthquake-rocks-north-idaho/32541898
http://www.krem.com/story/news/local/kootenai-county/2015/04/23/41-earthquake-hits-near-sandpoint/26282719/
http://www.emsc-csem.org/Earthquake/earthquake.php?id=438354
Fracking, CERN, HAARP, or whatever... Someone dicking around with stuff they have no business dicking around with?
One of my sisters experienced one across the country about a month or so ago. Said it shook about 4 minutes where she was.
Experienced a couple of mild ones there as a teen and and a few years later,which both were several years ago. Like a real long time.
http://www.cdapress.com/news/local_news/article_d6de7a32-4e32-5bf8-9e2a-32ca422c4c78.html