The seismograph geological formation detection data
acquisition industry was a help in unlocking the secrets of underground
northern Michigan where the pinnacle reefs were likely to dwell under
the cover of 5,000 to 7,000 feet of earth and rock. Seismic detection at
that time had problems detecting anything useful below the Dundee
formation. Much of seismic data found baffling things that shouldn't be
there left in Michigan's near surface strata, gifts left by the passing
of glaciers in comparatively recent times. Seismic exploration was
considered helpful, hopeful, and confusing at the time.
Here it should be explained that seismograph technologies
introduce sound or other energy into the earth and measure signals
returned to the surface after "bouncing off" subterranean structure.
Much like the way sonar works in water. It is a myth that seismograph
can find oil and gas it can however, detect structure that might contain
oil and gas and give explorationists a stronger clue about where to
drill. In other words, seismograph can tell you there is something down
there that looks like a raisin, but until you drill you don't know if it
is a juicy raisin, a rotten raisin, a dried up raisin or not a raisin
at all but a salty old peanut.