Geomorphology and Tectonic Setting of the Sanriku Coast, Northeastern Japan, and Introduction of Recent Studies on the Formation of Alluvial Plains and Holocene Crustal Movements Along the Coast
Geomorphology and Tectonic Setting of the Sanriku Coast, Northeastern Japan, and Introduction of Recent Studies on the Formation of Alluvial Plains and Holocene Crustal Movements Along the Coast
复制标题
日本东北部三陆海岸的地貌和构造背景及沿岸冲积平原的形成和全新世地壳运动的最新研究介绍
DOI：
10.1007/978-3-319-33814-9_2
复制
发表时间：
2016
期刊：
影响因子：
--
通讯作者：
T.
中科院分区：
文献类型：
--
作者：
Niwa;Y.;Sugai;T.
2011年的东北大地震极大地改变了日本东北部太平洋沿岸的沿海环境。特别是三陆海岸的同震沉降高达1.3米。然而，三陆海岸北部保存完好的中更新世至晚更新世海相阶地被解释为晚第四纪以来的隆升。这种长期隆升和短期沉陷之间的差异被认为是在一次不明的大逆冲地震中同震隆升造成的。本文介绍了三陆海岸的构造背景和海岸地貌地质的最新研究成果，重点介绍了三陆海岸南部全新世时期的地壳运动。最近的研究结果表明，与以往的观点相反，三陆北部海岸经历了长期的隆升，南部三陆海岸自10 ka以来（自最新更新世以来）一直在下沉。
The 2011 Tohoku-Oki earthquake dramatically changed the coastal environment along the Pacific coast of northeastern Japan. In particular, coseismic subsidence of up to 1.3 m was recorded along the Sanriku Coast . However, well-preserved Middle to Late Pleistocene marine terraces along the northern Sanriku Coast have been interpreted to indicate uplift since the Late Quaternary. This discrepancy between long-term uplift and short-term subsidence has been attributed to coseismic uplift during an unidentified megathrust earthquake. To clarify the interplay of uplift and subsidence, we introduce the tectonic setting of the Sanriku Coast and recent studies on the geomorphology and geology along the coast, which focus on crustal movements during the Holocene along the southern Sanriku Coast. The results of recent studies indicate that, contrary to the previous view that the northern Sanriku Coast has experienced long-term uplift, the southern Sanriku Coast has been subsiding since the 10 ka (since the latest Pleistocene).