Relational Analysis Between Tsunami and House Damage at the Inundation Area in Iwate, Japan

Yanagawa, Ryoichi; Sakai, Shigeki

doi:10.9753/icce.v34.structures.43

Cited by 2 publications

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“…The mussel bed had likely been positioned in the intertidal zone before the earthquake in light of the common habitat but was found in the subtidal zone when collected, likely because of land subsidence induced by the earthquake. With a local maximum height of 15.1 m, the 2011 Tohoku tsunami inundated approximately 6.68 km 2 of land around Otsuchi Bay, causing 5600 buildings to collapse . Detailed information on the sampling location can be found elsewhere. ,, …”

Section: Methodsmentioning

confidence: 99%

“…With a local maximum height of 15.1 m, 18 the 2011 Tohoku tsunami inundated approximately 6.68 km 2 of land around Otsuchi Bay, causing 5600 buildings to collapse. 19 Detailed information on the sampling location can be found elsewhere. 4,8,20 After collection, soft tissue was removed from the shells, which were then cleaned and dried at room temperature.…”

Section: ■ Materials and Methodsmentioning

confidence: 99%

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Mussel Shell Geochemical Analyses Reflect Coastal Environmental Changes Following the 2011 Tohoku Tsunami

Murakami‐Sugihara

Shirai

Hori

et al. 2019

ACS Earth Space Chem.

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Coastal areas are socioeconomically important but are susceptible to disturbances by both natural and manmade events. On March 11, 2011, the eastern coast of Japan was seriously inundated by a massive tsunami following the 2011 Tohoku earthquake. The tsunami caused a major disturbance around the coastal area. However, an understanding of the consequences of such an event is often hampered by a lack of knowledge of prior conditions. Furthermore, field observations during and immediately after the event are often particularly difficult. The present study demonstrates that environmental reconstruction by geochemical and growth pattern analyses of mussel shells successfully revealed transitional (daily) environmental changes caused by the Tohoku tsunami. A pronounced surge in shell Mn/Ca ratios observed immediately after the tsunami implies a drastic emission of pore water following sediment disturbance as well as a large input of terrestrial material through backwash. The subsequent decrease of the high Mn/Ca peak indicates a prolonged tsunami disturbance effect over ca. 40 days, with the stabilized shell Mn/Ca ratios observed thereafter (being higher than that prior to the tsunami) suggesting that the latter had altered the coastal environment, allowing for greater susceptibility to terrestrial input following ground subsidence and loss of coastal levees. Shell Mn/Ca patterns provide evidence for the tsunami-generated release of materials stored in sediments, such as organic, nutrient, and pollutant materials, which are then suspended in the water column for sufficient periods to allow for incorporation into geochemical cycles. Although the greatest environmental disturbance occurred immediately after the tsunami, the effects lasted for longer than several months thereafter.

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Section: Methodsmentioning

confidence: 99%

Section: ■ Materials and Methodsmentioning

confidence: 99%

Mussel Shell Geochemical Analyses Reflect Coastal Environmental Changes Following the 2011 Tohoku Tsunami

Murakami‐Sugihara

Shirai

Hori

et al. 2019

ACS Earth Space Chem.

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Development and Application of a Building Group Destruction Probability Model Based on the Great East Japan Earthquake Tsunami Experience

Yanagawa

2017

Journal of Natural Disaster Science

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This study examined the regional spatial characteristics of tsunami flooding and building damage using geographic information systems. An analytical model that evaluates total building destruction risk was developed using building damage data from coastal areas in Iwate Prefecture. Building density characteristics in the study area were categorized into four types of environments: (1) many isolated buildings, (2) combination of isolated and neighboring buildings, (3) combination of neighboring and surrounding buildings, and (4) many neighboring buildings. Many isolated buildings were located along the narrow, low-lying areas facing the Pacific Ocean. In comparison, higher building densities were observed along the inner part of the enclosed gulf topography. Most buildings located near the shoreline collapsed. Farther inland, a higher percentage of buildings experienced half-collapse or no-damage. Closer inspection of the varying spatial distribution characteristics and resultant building damage among the 27 target areas led to the identification of several key indicators for predicted building damage including the structure, use, and density of the affected building and the extent of tsunami inundation. Based on the building damage characteristics following the 2011 tsunami, a building group destruction probability model was developed and verified. The proposed model successfully estimated building collapse ratios using the available data.

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Relational Analysis Between Tsunami and House Damage at the Inundation Area in Iwate, Japan

Cited by 2 publications

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Mussel Shell Geochemical Analyses Reflect Coastal Environmental Changes Following the 2011 Tohoku Tsunami

Mussel Shell Geochemical Analyses Reflect Coastal Environmental Changes Following the 2011 Tohoku Tsunami

Development and Application of a Building Group Destruction Probability Model Based on the Great East Japan Earthquake Tsunami Experience

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