During August 2015, the University of Utah Seismograph Stations, responsible for the operation and analysis of the Yellowstone Seismic Network, reports 40 earthquakes were located in the Yellowstone National Park (YNP) region. The largest event was a small earthquake of magnitude 1.9 on August 20, at 03:34 AM MDT, located about 1 mile east-southeast of Lake, WY. No swarm activity occurred during the month of August in the YNP region.
Yellowstone earthquake activity in August remains at low background levels.
GPS stations in Yellowstone continue to record little or no deformation.
http://www.unavco.org/instrumentation/networks/status/pbo/data/HVWY (click on Static Plots / Time Series)
The Yellowstone Volcano Observatory (YVO) provides long-term monitoring of volcanic and earthquake activity in the Yellowstone National Park region. Yellowstone is the site of the largest and most diverse collection of natural thermal features in the world and the first National Park. YVO is one of the five USGS Volcano Observatories that monitor volcanoes within the United States for science and public safety.
September 02, 2015. Yellowstone, United – States :
44°25’48” N 110°40’12” W,
Summit Elevation 9203 ft (2805 m)
Current Volcano Alert Level: NORMAL
Current Aviation Color Code: GREEN
Source : YVO