San Joaquin Valley Land Subsidence Monitoring Network (1980s)

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.