Just to put it in perspective... I am about 60 miles from Sparks (rough epicenter of the 5.6), I just had some shaking and dishes rattling. No damage. A 6.0-6.9 will be destructive out to 99miles.
Not sure if dennis said it in this thread or another, Richter is based off of Log base 10 and the power release represented by richter is exponetial not linear. for instance, a 5.0 is ~31 times more powerful than a 4.0, and a 6.0 is ~63 times more powerful than a 5.0.
Yes, thank you. I already am aware of that. While there is no set definition of a large or major earthquake, the most widely accepted definition would be anything 7.0 or greater will be defined as a major earthquake. So again, I, personally, wouldn't call a 6.8 quake "huge", but maybe that's just me.