澁澤写真を用いた喜界島における台座岩の高さの推定 : 石灰岩地表面の溶解による低下速度の再検討 [in Japanese] Reexamination of Surface Lowering Rate of Uplifted Reef Limestone in Kikai Island, Southwestern Japan, Derived from the Height of a Pedestal in Shibusawa Film [in Japanese]
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Pedestal heights of reef limestone on the coastal terrace in Kikai Island are reexamined with regard to the depth of surrounding sand layer. An old photograph (Shibusawa Film) taken in 1936 suggests that the pedestals on the terrace II surface were artificially buried with sand. Photogrammetric measurement reveals that the sand fill layer is deeper than 60cm, whose depth has been considerably underestimated in the previous study. The surface lowering rate of the coastal terraces, i.e., the rainfall-induced dissolution rate of reef limestone, is then reevaluated to be 218-291mm/ky, which is 1.1-1.4 times higher than that previously estimated (205mm/ky).
- Transactions,Japanese Geomorphological Union
Transactions,Japanese Geomorphological Union 30(3), 227-231, 2009-07-25