San Joaquin Valley Land Subsidence Monitoring Network (2000s - 2010s)

Map of currently active extensometer and continous GPS sites in the San Joaquin Valley

Detailed Description

History of the San Joaquin Valley Land Subsidence Monitoring Network

California has experienced three droughts thus far in the 21st century (2001-2002, 2007-2009, and 2012-2016), bringing renewed subsidence to the San Joaquin Valley and the revitalization of the Monitoring Network. Four extensometers were refurbished in 2011-2012, which involved new reference tables and instrumentation, and the construction of new shelters.  These were added to the six extensometers that were operating at five sites.  Spirit-leveling and campaign GPS networks were generally maintained on major water-conveyance canals and highways only, and 13 Continuous GPS sites (maintained by various agencies/groups) are in operation on the Valley floor.


Image Dimensions: 560 x 487

Date Taken:

Location Taken: CA, US