TWO TEACHABLE MOMENTs: During late June a swarm of small magnitude earthquakes occurred near West Yellowstone, MT. Hundreds of events with magnitudes less than M3.5 (mb) stirred the area for several weeks. Near Lincoln, MT, a large magnitude M5.9 (Mww) earthquake woke up residents across the State at 16:30hrs UTC (12:30 a.m. MST) and was approximately 14 kms deep.
Below is a snapshot of the event on the seismometer -and- a ground shaking intensity map based on reports from local citizens. Ground shaking was the most intense near the epicenter. Why was shaking felt so far across the Big Sky State?