Late Quaternary vertical movements in eastern North America: Quantitative evidence of glacio-isostatic rebound
Late Quaternary vertical movements in eastern North America: Quantitative evidence of glacio-isostatic rebound
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北美洲东部晚第四纪垂直运动：冰川均衡回弹的定量证据
DOI：
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发表时间：
1972
期刊：
影响因子：
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通讯作者：
R. Walcott
中科院分区：
文献类型：
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作者：
R. Walcott
从18,000年到6500年前，覆盖北美的冰盖融化了，海平面上升了近100米。从那时起，海平面几乎保持不变，但地球尚未完成对冰负荷移除的调整。在隆起区的中心，地面在过去6000年中上升了138米，今天以2 ± 0.5厘米/年的速度上升;在达到均衡平衡之前，可能还有300 ± 120米的垂直运动。本文从不同来源和学科收集了北美洲北方和东部垂直运动的证据，在一份出版物中提供了对冰川均衡反弹的地球物理分析重要的定量数据。该文件涵盖的证据，从该地区的隆起和周边地区的淹没和过去的运动和仪器记录的最近的趋势，提供了一个讨论的海平面上升，并给出了更新的自由空气重力异常图的冰川消退地区。
From 18,000 to 6500 years ago the ice sheets covering North America melted, and sea level rose almost 100 meters. Since that time, sea level has remained almost constant, but the earth has not yet completed its adjustment to the removal of the ice load. In the center of the uplifted region the ground has risen 138 meters in the last 6000 years and is rising at a rate of 2 ± 0.5 cm/yr today; there may be another 300 ± 120 meters of vertical motion left before isostatic equilibrium is reached. This review collects the evidence of vertical movements in northern and eastern North America from different sources and disciplines to provide in one publication the quantitative data important for geophysical analyses of glacio-isostatic rebound. The paper covers evidence from the area of uplift and the peripheral zone of submergence and from the past movements and instrumentally recorded recent trends, provides a discussion of the eustatic rise in sea level, and gives an updated free-air gravity anomaly map of the deglaciated region.