San Joaquin Valley Land Subsidence Monitoring Network (1980s)
![Map of active San Joaquin Valley Land Subsidence Monitoring Network sites in the 1980s](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/full_width/public/thumbnails/image/subsidence1980.png?itok=gGei2z3l)
Detailed Description
History of the San Joaquin Valley Land Subsidence Monitoring Network
By the 1980s, monitoring activities in the San Joaquin Valley were greatly reduced. While 3 new extensometers were constructed, 8 were discontinued, leaving 26 extensometers operating at 18 sites. The decade also brought with it reduced spirit-leveling networks and a decrease in the frequency of measurements.
Sources/Usage
Public Domain.