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by carapace
2084 days ago
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Classic photo: https://water.usgs.gov/edu/gallery/landsubsidence-poland.htm... > This photo shows the approximate location of maximum subsidence in the United States, identified by research efforts of Dr. Joseph F. Poland (pictured). The site is in the San Joaquin Valley southwest of Mendota, California. Signs on pole show approximate altitude of land surface in 1925, 1955, and 1977. The land surface subsided about 9 meters from 1925 to 1977 due to aquifer-system compaction. |
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