Looks like it was upgraded:

3.4
DateTime: 2014-06-04 21:22:31
Region: Yellowstone National Park, Wyoming
Depth: 9.2
Source: USGS Feed

The Arkansas quake happened at the same time - just 3 minutes apart.

3.8
DateTime: 2014-06-04 21:19:24
Region: Arkansas
Depth: 3
Source: CSEM-EMSC Feed

I am reading a serious about Yellowstone exploding which in turn causes other massive quakes to occur.

If it was large enough, it would shake the Earth and one would expect several major quakes to happen in a short time if not at the same time. When you think about it, it could scare the crap out of ya!!!