They were fracing everywhere they could for about two good years are in nw La during the Haynesville shell boom. Didn't here a lot about the tremers except for some in east Texas which may have been unrelated. I've heard all the rumors of the ill effects of fracing but can't confirm any of it. I know we have kids every year coming up cancer and I won't eat fish caught out the rivers or Toledo Bend. But, we also had space shuttle debris in the lake too. Who knows what kind of science projects they had on board.
I've escorted the sysmic trucks before while they were doing their thing and don't recall feeling any vibration in a vehicle, but a home close by may feel it. They usually work in pairs or group of four.