GEONETの地殻変動データを利用した2016年熊本地震の被害解析  [in Japanese] DAMAGE ANALYSES FOR THE 2016 KUMAMOTO EARTHQUAKE USING COSEISMIC STRAINS OBTAINED BY GEONET DATA  [in Japanese]

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Abstract

2016年熊本地震はM<sub>J</sub> 6.5, M<sub>J</sub> 7.3という内陸地殻内地震としては比較的大きな規模をもって連続的に発生したことにより各種構造物に甚大な被害を与えた.本論文は同地震による各種構造物の被害に関する筆者らの最初の解析試行として自然斜面被害を対象に国土地理院のGEONETデータによる地震時地殻変動から得られる各種ひずみ量による解析結果を述べたものである.本論文では土木構造物,自然斜面を含む土構造物などの平面的な広がりを有する構造物の被害は変位の空間変動率である各種ひずみ量が強い影響を及ぼすとの観点に重点を置き,強震観測網データによる計測震度分布および地殻変動による各種ひずみ量分布などの諸量分布と自然斜面被害の分布との関係が考察される.

 The coseismic crustal deformations due to the 2016 Kumamoto Earthquake are numerically obtained using GEONET data. We further estimate coseismic strains of ground from the deformation data. The seismic intensity due to the earthquake is also obtained with use of strong motions by K-NET, KiK-net and other observation systems. Both parameters of the coseismic strains of ground and seismic intensity are compared with damage data of civil engineering structures. This paper especially places emphasis on comparisons between the coseismic strains and damages to soil structures such as ground slope. It is concluded that coseismic strains of ground mainly caused damages to ground slope and the characteristic distribution of coseismic strains in space resulted from the source mechanism of the 2016 Kumamoto Earthquake that had a strike-slip fault plane (right-lateral) with the break spread to the northeast direction.

Journal

  • Journal of Japan Society of Civil Engineers, Ser. A1 (Structural Engineering & Earthquake Engineering (SE/EE))

    Journal of Japan Society of Civil Engineers, Ser. A1 (Structural Engineering & Earthquake Engineering (SE/EE)) 73(4), I_270-I_281, 2017

    Japan Society of Civil Engineers

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