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Originally posted by Maluhia
OMG I just saw Susan on TV!!! How cool - They did say 50% reduction in earthquakes since moratorium. So there"might" be a connection.
Originally posted by Erongaricuaro
The people say they feel like they are living on a roller coaster. Could their assumptions be correct?
In the late 1930s, oil was discovered under Long Beach harbor. Its production helped Long Beach recover from the Depression and provided revenue to support expansion and modernization of the harbor as well as enriching individuals who owned land in the area. As a result when land near the oil field began to sink, those who were profiting from pumping the oil out from under the land resisted any suggestion that there could be a link between oil production and subsidence. They hired experts to defend their position. As the subsidence continued, those whose property was damaged by the sinking, but who were not benefiting from the oil production, hired experts to determine what was really causing the sinking.
While the controversy continued, the land kept sinking. It sunk like a big bowl and the bottom of the bowl was more than 25 feet below its previous elevation. Some warned that if the sinking continued, the ocean might inundate the city. The Navy Shipyard was near the bottom of the bowl and the Navy didn't own the mineral rights of the Shipyard so they were suffering damage but receiving no benefit so in 1958 the Navy sued all of the oil operators. Although the suit was never litigated or settled, it helped to convince many people that a proposed solution, pumping water into the fault blocks where the oil had been taken out, should be implemented. And that solution stopped the sinking.
Subsidence due to compaction of fine-grained sediments began in the San Joaquin Valley in the 1920's and in the Sacramento Valley in the 1950's. The area most affected has been in the southern and western parts of the San Joaquin Valley (fig. 93). Approximately one-half of the valley, or about 5,200 square miles, had subsided at least 1 foot by 1977; the total volume of subsidence was greater than 17 million acre-feet. The land surface declined nearly 30 feet from the 1920's to the late 1970's in an area southwest of Mendota (fig. 94). Importation of surface water and reduction in ground-water withdrawals during the 1970's slowed or stopped the decline of ground-water levels. In many cases, this allowed recovery to pre-1960's water levels and prevented further land subsidence.