Yet Another Earthquake

Driving home from work I heard a report on the radio that there had been another earthquake in our area earlier in the afternoon - a 3.5 magnitude-er.

We just now had another one - very strong, and this motion was different than the ones we had experienced before. Whereas the earlier quakes we felt shook the house suddenly up and down, this one was a rolling side to side motion which started strong and tapered off after about five seconds. 

This makes 17 or 18 quakes since April. I'm losing count.