The Effects of Liquefaction, Tsunami, and Land Subsidence on Intertidal Mollusks Following the Great East Japan Earthquake

Okoshi, Kenji

doi:10.1007/978-4-431-56448-5_12

Cited by 8 publications

(4 citation statements)

References 10 publications

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“…It may be possible to find tsunami breaks in shells excavated from fossils and shell mounds. L. pulchella is native to the coast of China and the Korean Peninsula, which is rarely subjected to tsunamis (Okoshi 2016), so this species is unlikely to be exposed to massive tsunamis in its native habitat. The 2011 Great East Japan Earthquake and the associated tsunamis are believed to have been the first such events that this species has experienced.…”

Section: Discussionmentioning

confidence: 99%

“…1d) have been lost due to ca. 80 cm of land subsidence since the earthquake (Okoshi 2015(Okoshi , 2016. Since October 2013, mountain sediment has been transferred to the sea to construct artificial tidal flats for Manila clam culture (Okoshi 2015).…”

Section: Methodsmentioning

confidence: 99%

“…It caused massive tsunamis that struck northern Japan. The sandy and rocky shore habitats where marine organisms, including mollusks, live in the intertidal zone were drastically changed by the tsunamis, and marine ecosystems suffered great damage (Miura et al 2012Okoshi 2013Okoshi , 2015Okoshi , 2016Suzuki 2013;Tamaki and Muraoka 2013;Takami et al 2013;Urabe et al 2013;Kawamura et al 2014;Kanaya et al 2014Kanaya et al , 2015Abe et al 2015Abe et al , 2017Noda et al 2016;Noda and Iwasaki 2017;Muraoka et al 2017).…”

Section: Introductionmentioning

confidence: 99%

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The “tsunami break:” impact of the Great East Japan Earthquake and the accompanying tsunamis on the shell growth of the invasive clam-eating snail Laguncula pulchella

Suzuki

Okoshi

2018

Fish Sci

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The Great East Japan Earthquake and accompanying tsunamis occurred on 11 March 2011, causing huge damage to marine organisms. The invasive naticid gastropod Laguncula pulchella (Euspira fortunei), which was introduced with the imported clam Ruditapes philippinarum from China and Korea, survived the earthquake. The "growth break line" observed on the shell surface in over 90% of the individuals collected in Matsushima Bay and Matsukawa-ura Lagoon after the tsunamis was examined by scanning electron microscopy. Each shell presented three layers before and three after the growth break. However, the fracture surface consisted of five layers-two prismatic and three crossed lamellar-around the growth break line. This suggests that shell formation temporarily ceased following the tsunamis and that the five-layered shell may have developed in response to the stress caused by the tsunamis. The newly formed middle layer became thinner after the "tsunami break," which may be the result of a rapid change in the mineralization process, including rapid shell growth and/or repair. These results suggest that the damage to and forcible removal of habitats by the tsunamis was stressful for L. pulchella. A decrease in or the cessation of shell formation after a tsunami may be a common phenomenon in mollusks that inhabit tidal flats.

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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The “tsunami break:” impact of the Great East Japan Earthquake and the accompanying tsunamis on the shell growth of the invasive clam-eating snail Laguncula pulchella

Suzuki

Okoshi

2018

Fish Sci

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“…The lagoon, which is one of the largest enclosed bodies of water in this region, includes a wide distribution of seagrass bed and oyster farming areas [9]- [11]. Because of the earthquake, this area was affected by a 0.7 m ground subsidence and a 7.7 m tsunami [12], [13].…”

Section: Methodsmentioning

confidence: 99%

Eelgrass Beds and Oyster Farming in a Lagoon Before and After The Great East Japan Earthquake of 2011: Potential for Applying Deep Learning at a Coastal Area

Yamakita

2019

IGARSS 2019 - 2019 IEEE International Geoscience and Remote Sensing Symposium

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There is a small number of case studies of automatic land cover classification on the coastal area. Here, I test extraction of seagrass beds, sandy area, oyster farming rafts at Mangoku-ura Lagoon, Miyagi, Japan by comparing manual tracing, simple image segmentation, and image transformation using deep learning. The result was used to extract the changes before and after the earthquake and tsunami. The output resolution was best in the image transformation method, which showed more than 69% accuracy for vegetation classification by an assessment using random points on independent test data. The distribution of oyster farming rafts was detected by the segmentation model. Assessment of the change before and after the earthquake by the manual tracing and image transformation result revealed increase of sand area and decrease of the vegetation. By the segmentation model only the decrease of the oyster farming was detected. These results demonstrate the potential to extract the spatial pattern of these elements after an earthquake and tsunami.

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Effects of Ground Uplift, Construction of an Artificial Tidal Flat and Tsunami Seawalls on Marine Life and Local Residents Following the 2011 Great East Japan Earthquake

Okoshi

2020

Evolution of Marine Coastal Ecosystems Under the Pressure of Global Changes

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The Effects of Liquefaction, Tsunami, and Land Subsidence on Intertidal Mollusks Following the Great East Japan Earthquake

Cited by 8 publications

References 10 publications

The “tsunami break:” impact of the Great East Japan Earthquake and the accompanying tsunamis on the shell growth of the invasive clam-eating snail Laguncula pulchella

The “tsunami break:” impact of the Great East Japan Earthquake and the accompanying tsunamis on the shell growth of the invasive clam-eating snail Laguncula pulchella

Eelgrass Beds and Oyster Farming in a Lagoon Before and After The Great East Japan Earthquake of 2011: Potential for Applying Deep Learning at a Coastal Area

Effects of Ground Uplift, Construction of an Artificial Tidal Flat and Tsunami Seawalls on Marine Life and Local Residents Following the 2011 Great East Japan Earthquake

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