| 末次冰消期气候转型对青藏高原东部地震活动的影响 |
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| 关键词:soft-sediment deformation structures paleo-earthquake isostatic rebound eastern Tibetan Plateau last deglacial period |
| 基金项目:国家自然科学基金项目(编号: 41807298; 41702372; 41572346);中国博士后基金(编号: 2019M650788);中国地质调查局项目(编号: DD20190319; DD20190059) |
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| The Impact of Climate Transition on Seismic Activities on the Eastern Margin of the Tibetan Plateau during the Last Deglaciation |
| The coupling of tectonic and climate is a hot topic in the earth system science. Through the collection and analysis of paleoearthquake and paleoclimatic data during the last deglacial (18–15 ka) in the eastern Tibetan Plateau, the authors found a large number of strong earthquake-induced soft sediment deformation structures or paleoseismic events in lacustrine sediments. During the 18–15 ka, the Longriba fault, the Longmenshan fault, the Xianshuihe fault, the Daduhe fault, and the Chenghai–Binchuan fault experienced paleoearthquakes or seismic landslide. During the last deglacial period, the rapid melting and erosion of mountain glacier (or ice cap) unloading in the Tibetan Plateau might have caused the stress unloading or isostatic rebound of the middle and upper crust, and the fluctuation of groundwater caused by glacial meltwater resulted in regional stress field changes and enhanced fault activity, which induced frequent seismic activity in this area. It is considered that the periodic glacial to interglacial or climate transition stage had a major impact or a significant impact on the terrain, landform, vegetation, and hydrology, and also the possible changes in regional tectonic stress fields and coulomb stress, periodic growth and extinction of ice sheets, groundwater hydrological fluctuations, as well as river erosion. The results obtained by the authors provide a better understanding of the patterns of tectonic activity, climate change, and geomorphic processes in the eastern Tibetan Plateau. |
| ZHONG Ning,JIANG Han-chao,LI Hai-bing,XU Hong-yan,LIANG Lian-ji.2021.The Impact of Climate Transition on Seismic Activities on the Eastern Margin of the Tibetan Plateau during the Last Deglaciation[J].Acta Geoscientica Sinica,42(1):21-31. |
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