Moose · Jul 6, 2017 17:29
Rain Shadow... They probably felt it, and got very nervous about it. Yellowstone is a huge caldera and one of the hottest volcanic spots in the world, so earthquakes are kinda scary.
https://www.nps.gov/yell/learn/nature/geology.htm
http://tbi.montana.edu/outreach/YNP%20Geology....