What is the term for the sinking of the ground when something is extracted from below?
Same thing can happen to oil drilling platforms at sea.
I saw a short film about a Phillips Petroleum platform (in the North Sea, IIRC)
that had the ocean-floor sink enough after pumping out a lot of oil that the
company had to put HUGHMONGOUS hydraulic jacks on the platform legs...then jack up
the platform so that the raging waves wouldn't destroy it.
posted on 03/02/2004 6:12:35 PM PST
Pollution and burgeoning populations stress Earth's water resources
This may be for subscribers to Science News only, but it has a terrific photo that vividly illustrates ground subsidence.
Withdrawal of groundwater in California's San Joaquin valley has caused the ground to subside by more than 9 m. Signs in this 1977 photo, taken near Mendota, show where the ground surface was in 1925 and 1955.
U.S. Geological Survey
posted on 03/02/2004 8:19:19 PM PST
(Vote Cheney - Rumsfeld in '08)
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