Sorry for not being clearer. I was thinking of this as a rather tight grouping a fairly good distance away from the recent Yellowstone swarm grouping.
I ran across this paper which gives a lot of details about the geology of the region around Soda Springs. Sounds like earhquake swarms aren’t unusual for the area.
https://pangea.stanford.edu/ERE/pdf/IGAstandard/SGW/2014/Welhan.pdf