Provenance of submerged stone pillars in an earthquake and typhoon hazard zone, coastal Tosashimizu, southwest Japan: A multidisciplinary geological approach
Provenance of submerged stone pillars in an earthquake and typhoon hazard zone, coastal Tosashimizu, southwest Japan: A multidisciplinary geological approach
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日本西南部土佐清水沿海地震和台风危险区的水下石柱来源：多学科地质方法
DOI：
10.1016/j.margeo.2019.105962
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发表时间：
2019
期刊：
影响因子：
2.9
通讯作者：
Tokuyama Hidekazu
中科院分区：
文献类型：
--
作者：
Tanikawa Wataru;Uramoto Go-ichiro;Hamada Yohei;Murayama Masafumi;Yamamoto Yuhji;Hirose Takehiro;Tadai Osamu;Tanaka Kouki;Ozaki Hiromasa;Yoneda Minoru;Tokuyama Hidekazu
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Human-made structures and shaped stones on the seafloor near coasts, possibly submerged by tsunami waves, coseismic subsidence, or flooding during typhoons, can often be linked to folk traditions of ancient natural disasters. Stone pillars that appear to have been artificially shaped are submerged in shallow waters inshore Tosashimizu city, southeast Japan, an area subject to repeated Nankai Trough earthquakes. We performed geophysical and geochemical analyses of samples from these pillars, building stones in use in villages in the Tsumajiro area, and nearby natural rock outcrops. In porosity and grain density, the pillars are similar to sandstone from the Tatsukushi Formation and to foundation stones used in the villages; this similarity was confirmed by a principal component analysis of chemical composition data. The shape and surface morphology of the pillars are also similar to those of the foundation stones and stone steps at nearby temples. Therefore, we inferred that the submerged stone pillars were made from Tatsukushi sandstone and had been utilized as building stones for structures such as steps and foundations in Tsumajiro village possibly >100 years ago. Because radiocarbon ages obtained on calcareous fragments adhering to the pillars were inconclusive, when, and by what process, the stone pillars were transported from the land and submerged in the sea is still uncertain.