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Geologist examines deformed rocks of a Proterozoic shear zone
Deformed rocks of a Proterozoic shear zone
Deformed rocks of a Proterozoic shear zone
Deformed rocks of a Proterozoic shear zone

Geologist Michael Frothingham observes strongly deformed rocks of a Proterozoic shear zone in the Medicine Bow Mountains (Wyoming, USA).

Geologist Michael Frothingham observes strongly deformed rocks of a Proterozoic shear zone in the Medicine Bow Mountains (Wyoming, USA).

red and white round buoys strung across the blue water of the California Aqueduct
California Aqueduct, San Joaquin Valley
California Aqueduct, San Joaquin Valley
California Aqueduct, San Joaquin Valley

The California Aqueduct flowing near Huron, CA in the San Joaquin Valley.  This spot is near one of several USGS land subsidence monitoring stations in the San Joaquin Valley.

The California Aqueduct flowing near Huron, CA in the San Joaquin Valley.  This spot is near one of several USGS land subsidence monitoring stations in the San Joaquin Valley.

USGS scientist standing with a pole annotated with land-surface elevation marks at given years at bench mark H 1235 RESET.
Land Subsidence near El Nido, CA
Land Subsidence near El Nido, CA
Land Subsidence near El Nido, CA

National Geodetic Survey vertical control bench mark H1235 RESET in Merced County, California. H 1235 RESET is in the median of State Highway 15. This is one of several bench mark locations used to help measure the largest recent subsidence in the area using repeat surveys.

National Geodetic Survey vertical control bench mark H1235 RESET in Merced County, California. H 1235 RESET is in the median of State Highway 15. This is one of several bench mark locations used to help measure the largest recent subsidence in the area using repeat surveys.

USGS scientist standing with a pole annotated with land-surface elevation marks at given years at bench mark W 990.
Land Subsidence near El Nido, CA
Land Subsidence near El Nido, CA
Land Subsidence near El Nido, CA

National Geodetic Survey vertical control bench mark W990 CADWR in Merced County, California. W 990 CADWR is on the Mariposa Bypass Bridge on Washington Rd. This is one of several bench mark locations used to help measure the largest recent subsidence in the area using repeat surveys.

National Geodetic Survey vertical control bench mark W990 CADWR in Merced County, California. W 990 CADWR is on the Mariposa Bypass Bridge on Washington Rd. This is one of several bench mark locations used to help measure the largest recent subsidence in the area using repeat surveys.

Map of the San Joaquin Valley displaying contours of land subsidence that occurred from 2008 to 2010.
2008-2010 Land Subsidence Contours, San Joaquin Valley, California
2008-2010 Land Subsidence Contours, San Joaquin Valley, California
2008-2010 Land Subsidence Contours, San Joaquin Valley, California

Land subsidence contours showing vertical changes in land surface in the central San Joaquin Valley area, California, during January 8, 2008-January 13, 2010. The top graph illustrates elevation changes computed from repeat geodetic surveys along Highway 152 for 1972-2004.

Land subsidence contours showing vertical changes in land surface in the central San Joaquin Valley area, California, during January 8, 2008-January 13, 2010. The top graph illustrates elevation changes computed from repeat geodetic surveys along Highway 152 for 1972-2004.

map of San Joaquin Valley shaded by 2008-2010 subsidence in millimeters
Subsidence (2008-2010), San Joaquin Valley, California
Subsidence (2008-2010), San Joaquin Valley, California
Subsidence (2008-2010), San Joaquin Valley, California

Map showing estimated regions of subsidence derived from interferograms for 2008–2010 and selected surface-water conveyance infrastructure in the San Joaquin Valley area of the Central Valley, California.

Map showing estimated regions of subsidence derived from interferograms for 2008–2010 and selected surface-water conveyance infrastructure in the San Joaquin Valley area of the Central Valley, California.

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