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But the thermal images revealed cracks in a wall, which later proved to be signs of subsidence.

The study by Stanford University researchers is the first to quantify the full extent of land subsidence in the San Joaquin Valley, one of the world’s major farming regions, during the last two decades.

Due to the climate crisis, urban river deltas are facing hazards such as rising sea levels, extreme weather events, and soil subsidence.

He said continuing subsidence in the area now threatens to undermine recent repairs and investments including $83 million in state taxpayer funds.

Other issues including subsidence added to the insurers' total payouts.