The average quake in the two previous "Hawhorne" swarms
are around 6 miles deep. And what the seismo graphs show
during the swarms are what appears to be a mess of broken
rock down there.

Could there be water moving through some of these areas
with similar geography? Broken or crushed granite....
moving things around....causing BOOMS, or rumbling,
but never producing an earthquake. Such as has been
reported in Ohio, Florida, South Carolina, Virginia, etc.

While here on the west coast where it is seismically active,
we get bona-fide quakes.

Walker Lake (just north of these swarms) has a high saline
content. It lies in the Great Basin. And to the east lies the
ammo depot, which not too long ago was called the...
"Naval Undersea Warfare Center".

Things that make you go

I just found this old link...
[link to www.thelivingmoon.com]

Yes, I knew it was John Lear who pushed me down this rabbit hole.

I always took these things as entertainment and information
in the past, and with a heavy grain of salt. How could one
possibly prove any of these theories (underwater bases)
anyway?

Well, now....after pondering on the hydroplate theory and
the possibility of sea water at 6 ~ 8 miles down....
I'm rethinking things.