Some of the quakes recently and regarding a swarm of 2400 quakes that hit in September 2017

In fact, the same area saw an even bigger swarm between June and September of 2017, when 2,400 temblors hit the same approximate region. The current swarm may actually be the continuation of that earlier swarm, Poland said. [Yellowstone and Yosemite: Photos of Two of the World's Oldest National Parks]

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Swarm of 200 Earthquakes Hits Yellowstone - Here's What That Means

Live Science · 

 

The following is an example of some of the quakes they have had in Yellowstone in the last few days or so.

 

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 https://www.google.com/search?q=earthquakes+in+yellowstone&ie=utf-8&oe=utf-8&client=firefox-b-1-ab

Magnitude 3.1 earthquake

38 miles from Big Sky, MT · Feb 18, 7:29 AM

More on earthquake.usgs.gov

Recent earthquakes

M 2.7

39 miles from Big Sky, MT

Feb 20, 4:38 PM

M 2.8

39 miles from Big Sky, MT

Feb 18, 9:43 AM

M 2.8

38 miles from Big Sky, MT

Feb 18, 9:34 AM

M 2.9

39 miles from Big Sky, MT

Feb 18, 7:17 AM

M 2.7

39 miles from Big Sky, MT