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Appendix 13
Seismology
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.
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