I think earthquakes are pretty normal for CA but not for nevada.... but I am no expert. Seems these days there are lots of quakes in odd places.

The USGS site has a page for each state that shows its "earthquake risk". You could look at that page for Nevada and it should say if it is normal or not. It goes according to color and is very easy to use.

OK, here is the map I was talking about:

[link to earthquake.usgs.gov]

Some areas on the Cali border look dangerous (red)... maybe those areas are causing these quakes?

I hope this helps.