Show Crop's got it right. That's a seismic crew. They either set off explosives to make a shockwave, or these vibratory trucks, and they have long strings of microphones that look like orange extension cords strung along the ground. It's like echo sounding when ships are looking for submarines, but now they're looking to see what rock formations are underground. Very common in the oil and gas industry, although it is also done by universities or government just to do research on local geology. If it's industry, probably oil, maybe mining, depending on your location.
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Today's Featured Article - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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