I learned every facet of seismic work from drilling the hole into which dynamite would be placed and tamped with water, to laying out arrays of sound wave detectors (seismometers) connected to a recording apparatus. One holiday weekend when the rest of the crew had gone home I went through all the steps outlined above and predicted the depths of various layers that a nearby drilling crew would encounter. I was spot on.
With permission of the author. This is an on going story one paragraph at a time beginning on the post of July 6th. We will get back to our music and art after this little break.