The discovery of emerged boring bivalves at Cape Omaezaki, Shizuoka, Japan: Evidence for the 1361 CE Tokai earthquake along the Nankai Trough

The discovery of emerged boring bivalves at Cape Omaezaki, Shizuoka, Japan: Evidence for the 1361 CE Tokai earthquake along the Nankai Trough
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日本静冈县御前崎岬发现钻探双壳类:公元 1361 年东海地震沿南海海槽的证据

DOI:
10.1016/j.margeo.2018.08.006
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发表时间:
2018
期刊:
影响因子:
2.9
通讯作者:
T. Haga
T. Haga
中科院分区:
地球科学2区
文献类型:
--
作者:
A. Kitamura;Y. Seki;Y. Kitamura;T. Haga

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这项研究在日本中部静冈市尾崎角的一个截波平台上发现了几个钻井双壳类Penitella gabbii的原位化石贝壳,暴露在平均海平面1.0 5-1.35 m的泥岩中。该地区与南开海槽相邻,南开海槽曾发生8级大地震,地震重现期为90~200年 。以生存上限P为基础。根据Gabbii(高于平均海平面0.8 m)和大地测量数据,估计壳体自活动以来的总隆升达2.5 m。根据研究区周围隆起的阶地沉积和贝壳化石的~(14)C测年结果,我们提出这些化石为1361年东海地震(苏鲁加海槽破裂和南开海槽东半部破裂)与1361年东海地震(南开海槽西半部破裂)的配对提供了新的证据。
This study found several in situ fossil shells of the boring bivalvePenitella gabbiiexposed in mudstone at an elevation of 1.05–1.35 m above mean sea level in a wave-cut platform at Cape Omaezaki, Shizuoka, central Japan. This region faces the Nankai Trough where great earthquakes (M ~8) occur with a recurrence interval of 90–200 years. Based on the upper limit of livingP. gabbii(−0.8 m above mean sea level) and geodetic data, the total uplift of shells since the time of their active is estimated to be up to 2.5 m. Using14C dates from the uplifted terrace deposits around the study area and shell fossils, we propose that the emerged fossils provide new evidence for the pairing of the 1361 CE Shohei (Koan)–Tokai earthquake (rupture of Suruga Trough and the eastern half of the Nankai Trough) with the 1361 CE Shohei (Koan)–Nankai earthquake (rupture of the western half of the Nankai Trough).
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