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Subsidences Due to Underground Mining

The origin and evolution of sinkholes as well as of large subsidence depressions above underground excavations are explained by the changes in strain in rocks due to the mining activity. But on the periphery of the destructive ellipsoid the extension of rocks and the upheaval of the earth surface also take place, caused by the lowering of the strain. This phenomenon pertains not only to undermined areas but it also partakes in the upheaval of the borders of trogs and rifts, and all raised blocks of the earth's crust.