| 沉陷 | subsidence 1. A sinking down of a part of the earth's crust, generally due to underground excavations. 2. The sudden sinking or gradual downward settling of the Earth's surface with little or no horizontal motion. The movement is not restricted in rate, magnitude, or area involved. Subsidence may be caused by natural geologic processes, such as solution, thawing, compaction, slow crustal warping, or withdrawal of fluid lava from beneath a solid crust; or by man's activity, such as subsurface mining or the pumping of oil or ground water (1. 由于地下挖掘造成的地球的地壳部分下沉。2.突然或逐渐下沉，地球几乎没有或根本没有水平运动表面向下沉降。该运动不限速度，规模，或地区。沉降可能是由于自然地质过程，如溶解，融化，压实，流体熔岩退出了坚实的地壳下，或由于人的活动，如地下采矿或石油或地面抽水。) |
