徳島大学 教育・研究者情報データベース(EDB)

1. 西山 賢一([徳島大学.大学院社会産業理工学研究部.理工学域.自然科学系.地球科学分野]/[徳島大学.理工学部.理工学科.自然科学コース.地球科学講座])

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2. (日) 吉田 顕

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3. (日) 横田 修一郎

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(英) Morphological features of tafoni on cliffs of the Miocene tuff, Wakayama Prefecture, Japan

(日) 和歌山県に分布する中新世凝灰岩の急崖に発達するタフォニの分布と形状

(英) Morphological features of tafoni on Miocene tuff cliffs have been studied in the Kozagawa area, Wakayama, Japan. Distribution of tafoni tends to develop on steep slopes characterized by massive fine-grained acidic tuff. Concave roof of tafoni has been formed with high decreasing rate of rock strength under high humid condition.This supports that concave roofs have been formed due to high rate of salt weathering.Piling up of rock blocks on the foot of such cliffs indicates that evolution of tafoni isclosely related to rock fall from the cliffs. Development of tafoni makes a sort of canopies overhanging on steep cliff, and such unstable portions fall down as rock fall. In addition to development of tafoni, cracks within acidic tuff are also one of causes of rock fall. Such cracks occurred due to rotational moment of overhanging portion.Consequently, weathering rates of rocks due to salt weathering and spacing of these cracks are control the frequency of rock fall in these cliffs.

1. (英) tafoni
2. (英) rockfall
3. (英) Kumano acidic tuff
4. (英) weathering
5. (英) Wakayama Prefecture