摘要
Since the Cenozoic,especially the Quaternary,tectonic movement has been strengthening in northwestern Yunnan,China.The tectonic elevation rate of mountains changed from 0.3～ 1.7 mm/a(before the Holocene)to 2～ 7.1 mm/a(after the Holocene).The subsiding velocity of the Holocene basins increases by 1～ 2 orders of magnitude relative to the Pleistocene.The displacement rate of the Quaternary fractures increases continuously.Modern crustal stress values become high.Tectonic deformation speeds up.Seismic activities strengthen.Geothermal flux anomaly is pronounced.The strengthening tectonic activities will result in changes of the topographic frame of northwestern Yunnan,worsen mountain geologic disaster,speed up the contraction of lakes and decrease the regional stability.Therefore,human beings will face the challenge of a more rigorous environment.
Since the Cenozoic,especially the Quaternary,tectonic movement has been strengthening in northwestern Yunnan,China.The tectonic elevation rate of mountains changed from 0.3～ 1.7 mm/a(before the Holocene)to 2～ 7.1 mm/a(after the Holocene).The subsiding velocity of the Holocene basins increases by 1～ 2 orders of magnitude relative to the Pleistocene.The displacement rate of the Quaternary fractures increases continuously.Modern crustal stress values become high.Tectonic deformation speeds up.Seismic activities strengthen.Geothermal flux anomaly is pronounced.The strengthening tectonic activities will result in changes of the topographic frame of northwestern Yunnan,worsen mountain geologic disaster,speed up the contraction of lakes and decrease the regional stability.Therefore,human beings will face the challenge of a more rigorous environment.
基金
The study is finicially supported by the Natural Science Foundation of Yunnan Province,China(No.97D031M).
