Bradyseism is the gradual uplift (positive bradyseism) or descent (negative bradyseism) of part of the Earth`s surface caused by the filling or emptying of an underground magma chamber and/or hydrothermal activity, particularly in volcanic calderas. It can persist for millennia in between eruptions and each uplift event is normally accompanied by....
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slow up-and-down movement of the earth's crust
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bradyseism, bradyseismic The slow upward and downward motion of the earth’s crust.
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