Escape From L.A. on Foot part A: Oil's Fault скачать в хорошем качестве

Escape From L.A. on Foot part A: Oil's Fault

I begin a 225-mile walk across Southern California from the Pacific to the Mojave Desert while discussing local geology, starting with the oilfield beneath Long Beach and the Newport-Inglewood Fault. Whereas the last series I uploaded about this trek was just brief clips uploaded with no editing, this new series will feature slightly longer and more edited vignettes, accompanied by relevant illustrations. Hopefully I'll get a new one posted every week or two . . . *A note on the dog/fire hydrant photo: The photo of oil-well casings standing high and dry above the ground after subsidence makes sense, because those wells are anchored very deep in the ground, where the oil is being extracted from. So the oil is extracted, the land sinks, and then the wellheads end up hanging in the air. But the fire hydrants, on the other hand, would be anchored to the water mains, which would be floating in shallow soil well above the area of oil depletion—so it's not immediately clear why the water mains and fire hydrants wouldn't just sink along with the surrounding ground. But I did read that one of the early techniques to deal with the land subsidence was to simply add enough fill dirt on top to keep coastal land above sea level. So it's possible that this photo actually represents a hydrant that has simply been erected atop a tall pipe in preparation for trucking in a lot of fill dirt. They apparently abandoned this approach after realizing how difficult it would be to repair the now deeply buried water mains. Modern oil production in the region is accompanied by simultaneous water injection to prevent further subsidence.