Geophones & Seismometers
Thursday, 20 August 2020
Lovely geologists David Fredricks & Peter Bell have suggested:
Geophone
They both recommend having it very very tightly into the rock – epoxied in as well its spikes driven in.
Seismometers
“… one researcher’s noise is another’s signal…”
Seismometers pick up noise signals between & under actual events. A longstanding regular noise signal in 26 second periods has been used by seismologists to sync mechanisms & correct clock drift.
This article talks about where this noise can come from – soccer matches, waves in a distant ocean… Apparently the 26 second thing comes from waves in the Gulf of Guinea, Bight of Bonny.
“The interaction of the waves with the shallow seafloor changes the ocean wave energy into seismic waves that travel through solid earth.”