Mid-Holocene Underwater Jomon Sites along the West Coast of Kyushu, Japan, Hydro-isostasy and Asthenospheric Viscosity
Mid-Holocene Underwater Jomon Sites along the West Coast of Kyushu, Japan, Hydro-isostasy and Asthenospheric Viscosity
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日本九州西海岸全新世中期水下绳文遗址、水力均衡和软流圈粘度
DOI：
10.4116/jaqua.37.315
复制
发表时间：
1998
期刊：
影响因子：
--
通讯作者：
Y. Maeda
中科院分区：
文献类型：
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作者：
M. Nakada;J. Okuno;Y. Yokoyama;S. Nagaoka;Shinji Takano;Y. Maeda
通常在日本九州西海岸观察到的全新世中期水下绳文遗址，可以通过末次冰消蚀造成的水力均衡调整来合理解释。这些水下绳纹遗址的分布对250km深度以上的流变结构非常敏感，海平面变化的观测与预测对比表明，岩石圈厚度为30-50km，有效软流圈粘度（-200km厚度）为（8-20）×1019Pa·s。软流圈与下伏上地幔之间的粘度对比小于10，即使在日本列岛等岛弧区域也可能不存在明确的低粘度软流圈。因此，冰期后区域海平面具有时空变化，并依赖于水力均衡调整引起的地壳倾斜，可能限制了史前人类住区和生活方式的发展。
Mid-Holocene underwater Jomon sites typically observed along the west coast of Kyushu, Japan, are reasonably explained by the hydro-isostatic adjustment due to the last deglaciation. The distribution of these underwater Jomon sites is very sensitive to the rheological structure above 250km depth, and comparisons between observations and predictions of sea-level variations indicate a lithospheric thickness of 30-50km and an effective asthenospheric viscosity (-200km thickness) of (8-20)×1019Pa s. The viscosity contrast between the asthenosphere and the underlying upper mantle is less than 10, and a well defined low-viscosity asthenosphere may not exist even in the island arc regions such as the Japanese Islands. Thus regional postglacial sea-levels are spatio-temporally variable and dependent on crustal tilting caused by hydro-isostatic adjustment, and they might have constrained the development of prehistoric human settlements and the way of lives.
极地冰盖的流变学
DOI：
--
发表时间：
2008
期刊：
影响因子：
--
作者：
Azuma;N.;東信彦
通讯作者：
東信彦