Uplift and Subsidence in the Santa Clara Valley, 1992-1997

Between 1992 and 1997 some uplift occurred due to recovering groundwater levels. This interferogram (above) indicates no change for most of the southwestern Santa Clara Valley, and land-surface uplift of up to about 24mm (.94 in) in the northern and eastern parts of the valley. This uplift is correlated to the recovery of groundwater levels that occurred for several years as a result of reduced pumpage and increased recharge.