open access

https://hdl.handle.net/2115/91440

A new index representative of seismic cracks to assess post-seismic landslide susceptibility

英語

2022-04

John Wiley & Sons

Transactions in GIS

26(2)

1040-1061

In a major earthquake, strong shaking reduces the natural soil strength. Therefore, evaluation of the susceptibility of post-seismic landslides may help prevent further disasters in an affected area. This study developed an index representing the spatial density of seismic cracks-the dense crack index (DCI)-to express the degree of local ground effects. An area of 6 km(2) with 196 slides identified after the 2016 Kumamoto earthquake (Mw 7.0) was analyzed using models that incorporated the weight of evidence (WoE), logistic regression, and random forest (RF) methods, with the DCI as a conditioning factor. The WoE and RF models confirmed the importance of the DCI, although the improvement in performance as indicated by area under the curve values was marginal or negligible. This was largely due to combinations of other factors that enabled inclusion of locations with strong seismic waves, which compensated for the absence of the index. The contribution of the DCI could be improved if more accurate LiDAR data were used in the analysis.

学術雑誌論文

Accepted Manuscript

This is the peer reviewed version of the following article: Yamaguchi, S., & Kasai, M. (2022). A new index representative of seismic cracks to assess post-seismic landslide susceptibility. Transactions in GIS, 26, 1040– 1061, which has been published in final form at https://doi.org/10.1111/tgis.12900. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions. This article may not be enhanced, enriched or otherwise transformed into a derivative work, without express permission from Wiley or by statutory rights under applicable legislation. Copyright notices must not be removed, obscured or modified. The article must be linked to Wiley’s version of record on Wiley Online Library and any embedding, framing or otherwise making available the article or pages thereof by third parties from platforms, services and websites other than Wiley Online Library must be prohibited.

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