MECHANISM OF THE GRABENS THAT FORMED IN THE ASO CALDERA DURING THE 2016 KUMAMOTO EARTHQUAKE

Susumu YASUDA; Naoto OHBO; Masanobu SHIMADA; Tatsuro CHIBA; Hideo NAGASE; Satoshi MURAKAMI; Shigeki SENNA; Naoko KITADA; Keisuke ISHIKAWA

doi:10.5610/jaee.21.6_31

論文

MECHANISM OF THE GRABENS THAT FORMED IN THE ASO CALDERA DURING THE 2016 KUMAMOTO EARTHQUAKE

Susumu YASUDA, Naoto OHBO, Masanobu SHIMADA, Tatsuro CHIBA, Hideo NAGASE, Satoshi MURAKAMI, Shigeki SENNA, Naoko KITADA, Keisuke ISHIKAWA

著者情報

キーワード: Kumamoto Earthquake, Graben, Aso Caldera, Lake deposit

ジャーナルフリー

2021 年 21 巻 6 号 p. 6_31-6_56

DOI https://doi.org/10.5610/jaee.21.6_31

詳細

抄録

During the 2016 Kumamoto Earthquake, many special belt-like subsidences called “grabens” occurred in the Aso Caldera, and houses were severely damaged. According to the measurement results of SAR, a horizontal displacement of 2 to 3 m was generated in the area where the grabens occurred. A lake was formed in this area around 9,000 years ago. A soil investigation showed that the bottom of the old lake was bowl-shaped, and a special clay was deposited there. A residual deformation analysis showed that the soft clay flowed due to the earthquake, causing the grabens at the ground surface.

責任著者(Corresponding author)

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