There are a ton of end-of-the-world fanatics around on the Internet (almost as many as we see for CAHSR-oh-noes or no-oil-trains), and many of them are capable of well-produced video. Full-scale GIS software is available for free, and many of the e-o-t-w folk are financially capable of buying the really good stuff. So beware of earthquake materials from sources other than known-good ones (like USGS, well-known universities with geology programs, and state geological surveys).

USGS has published a number of posters and other public information about earthquake swarms (which are common, especially in the Great Basin and Walker Lane). The Nevada Seismological Lab at Univ. of Nevada, Reno, has more details, sometimes. Some other CA-NV reliable sources include California Geological Survey, UC Berkeley (as provided by Al Stangenberger above), and EERI (usually with reports well after the fact). USGS has good more-information links at many of its earthquake pages.

So far, none of the recent CA-NV swarms other than Greenville and Somerset-Mogul seem to have affected railroads. Even those had only minor effects (rockfalls, delay to inspect tracks, etc.).

The stuff happening in Arkansas-Oklahoma-Kansas and North/East Texas seems to be related in some way to oil drilling, and especially fracking and resulting waste fluid injection. Still lots of theories about what's happening and how, but smaller-scale activity has been associated with deep injection wells before (couple of spots in Colorado, for instance). But it's interesting since it's in the middle of the continent where recently active faults are otherwise rare. USGS has some briefing materials on them, too, but detailed studies are a bit hard to find. The conspiracy & panic types, of course, are having a small-scale field day there too. Interesting that OK now often has more earthquakes that are big enough to feel, per day, than CA or even AK.