Truthfully i have never heard "booms" with earthquakes. Sure they are noisy because of what is being rattled... but i cant say the earthquake itself had noise.
You would think after all of this time though, they would have put up round the clock microphones to capture the sound.
And I live less than 40 miles away. Nothing supposedly detected here. And you've never heard booms happening with earthquakes? I never knew.
I've wondered if some sort of sink hole or other pocket has opened up under the area or something.
Also, to recall that they ruled out Earthquakes very early on.
Of course, to throw a bone to conspiracy nuts, these were detected with mobile sensors that 'just happened' to be in the area. So now you can start screaming about HAARP and Tesla Howitzers too.