Wow this one is new.
By definition, 3.5 is the threshold of temblors generally detectable by most people. There are hundreds of 1.9 shivers everywhere in the world every day.
@JVIP-WTPNN. I have a friend who has thermometers everywhere and can't stand it when the temperature goes up one degree. You might want to lose that vibrometer. Just a thought.
If you go through a 7, as have I, the little ones won't give you a second thought anymore.