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Landslides in Recent Earthquakes and Damage to Lifelines

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Understanding and Reducing Landslide Disaster Risk (WLF 2020)

Part of the book series: ICL Contribution to Landslide Disaster Risk Reduction ((CLDRR))

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Abstract

This review article summarizes some important findings in recent past earthquakes. One of these findings is that multiple landslides in the epicentral area of the 2004 Chuetsu Earthquake were found along stripes of large co-seismic stress changes, which appeared far away from a surface seismic fault trace. A similar pattern of stress changes may have occurred over and over in the same epicentral area, thus suggesting that we will perhaps be able to be prepared for the next knowing these patterns. Also, it is shown herein that a multiple linear regression analysis for the geometric parameters of many landslides in the epicentral area of the 2018 Hokkaido earthquake can give us the average values of frictional coefficients on both hill slopes and flat depositional areas. These values can help estimate possible runout distances in this area. The observed geometric features of these landslide masses have a striking resemblance to those in the other earthquake-hit area draped with volcanic products, in terms of not only their appearances but also their runout distances.

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Acknowledgements

The first half of this paper summarizes some of the outcomes of the Research Project “Detection of Lagrangian displacements of terrains along an active fault and their implementation for land conservation”, No 23246087 (Project leader: Kazuo Konagai), Ministry of Education, Culture, Sports, Science and Technology.

The following second half reports some findings obtained through a field survey that the author has jointly conducted with the team of lifeline earthquake engineering experts of the American Society of Civil Engineers (ASCE) led by Mr. John Eidinger and Mr. Alex Tang. This survey was partially supported by the Grant-in-Aid for Scientific Research (A), No. 16H02744.

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Correspondence to Kazuo Konagai .

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Konagai, K. (2021). Landslides in Recent Earthquakes and Damage to Lifelines. In: Arbanas, Ž., Bobrowsky, P.T., Konagai, K., Sassa, K., Takara, K. (eds) Understanding and Reducing Landslide Disaster Risk. WLF 2020. ICL Contribution to Landslide Disaster Risk Reduction. Springer, Cham. https://doi.org/10.1007/978-3-030-60713-5_2

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