Mode of vertical crustal movements during the Late Quaternary in Kyushu, Japan, deduced from heights of ancient shorelines
Mode of vertical crustal movements during the Late Quaternary in Kyushu, Japan, deduced from heights of ancient shorelines
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从古海岸线高度推断日本九州晚第四纪地壳垂直运动模式
DOI：
10.1016/s0040-1951(98)00280-7
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发表时间：
1999
期刊：
影响因子：
2.9
通讯作者：
K. Takemura
中科院分区：
文献类型：
--
作者：
S. Shimoyama;H. Kinoshita;M. Miyahara;Y. Tanaka;T. Ichihara;K. Takemura
日本西部九州岛现今海岸线沿线的古海岸线沿着数据表明，根据过去12.5万年来地壳垂直运动的模式，可以将该岛划分为几个区域。利用软体动物群、遗迹化石和沉积结构等古深度指标确定了古代海岸线的高度。沉积物和构造事件的年代学是从日本南部火山灰事件（火山灰地层学）的历史中推导出来的。在过去的125，000年里，岛上最隆起和最下沉的地区之间的差异约为190米。虽然以前认为整个九州岛在这段时间内都是一个正在上升的区域，但目前的工作表明，有明显的差异运动。九州北部和西南部是稳定的沉降区，但岛屿南部局部地区发生了快速隆起。一个沉降轴（佐岐-仙台沉降轴）以东北-西南走向穿过岛屿，一个东西走向的构造凹陷（别府-岛原地堑）出现在九州中部。该岛现今的海岸地貌与过去125 000年间发生的差异性构造运动之间存在明显的相关性。
Data from the ancient shorelines along the present-day coastline of Kyushu Island, western Japan show that the island can be divided into several regions on the basis of modes of vertical crustal movements over the past 125,000 years. The heights of the ancient shorelines have been determined using paleodepth indicators such as molluscan faunas, trace fossils and sedimentary structures. The chronology of the sediments and of the tectonic events has been deduced from the well-documented history of volcanic ash events (tephrostratigraphy) of southern Japan. The difference between the most uplifted and subsided areas the island during the past 125,000 years is about 190 m. Although it was previously thought that the whole of Kyushu Island was a region undergoing uplift throughout this time, the present work shows that there were marked differential movements. North and southwest Kyushu were steadily subsiding areas, but rapid uplift occurred locally in the southern part of the island. A subsiding axis (the Saeki–Sendai Subsiding Axis) crosses the island with a NE–SW trend, and an E–W-trending structural depression (the Beppu–Shimabara Graben) is present in central Kyushu. There is a clear correlation between the present-day coastal landform of the island and the differential tectonic movements that have occurred during the past 125,000 years.