Landslides triggered by the 6 September 2018 Mw 6.6 Hokkaido, Japan: an updated inventory and retrospective hazard asses
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RESEARCH ARTICLE
Landslides triggered by the 6 September 2018 Mw 6.6 Hokkaido, Japan: an updated inventory and retrospective hazard assessment Yulong Cui 1 & Pengpeng Bao 1 & Chong Xu 2
&
Siyuan Ma 3 & Jun Zheng 4 & Gui Fu 1
Received: 7 April 2020 / Accepted: 25 October 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract On September 6, 2018, an Mw 6.6 earthquake occurred in Hokkaido, Japan, triggering massive landslides. Based on the 0.3 mresolution Pleiades-1 satellite image on the Google Earth platform, we constructed an updated co-seismic landslide inventory for this event, which permitted to map 12,586 landslides. These slope failures are featured by a large number, wide spread, large scales, and local dense distribution. Considering nine influence factors, i.e. elevation, slope angle, slope aspect, curvature, distance to road, distance to river, distance to the epicenter, lithology, and topography, the logistic regression model was applied to carry out a retrospective hazard assessment of earthquake-triggered landslides in the affected area, and the rationality of such prediction was verified by the real landslides mapped. Results show that the landslide hazard evaluation map is in good agreement with the actual landslide distribution. The success rate of the hazard assessment map is 87.0% compared to training samples, and 86.5% compared to testing samples, respectively. The updated landslide inventory is a useful complement to the existing landslide inventory maps and the landslide hazard assessment map is helpful for landslide disaster prevention and reduction and reconstruction planning in the affected area. Keywords Co-seismic landslides . Visual interpretation . Landslide inventory . Logistic regression model . Retrospective hazard assessment
Introduction Earthquakes can trigger various secondary geological effects, such as landslides, debris flows, barrier lakes, and tsunamis which cause large losses to human life and property (Chen 2009; Cui et al. 2018; Dai et al. 2011; Xu et al. 2012; Yang et al. 2011). In particular, landslides triggered by major earthquakes account for a considerable proportion of seismic hazards (Cui et al. 2019; Huang 2009; Xu et al. 2018a). Carrying out * Chong Xu [email protected] 1
School of Civil Engineering and Architecture, Anhui University of Science and Technology, Huainan 232001, Anhui, China
2
National Institute of Natural Hazards, Ministry of Emergency Management of China (former Institute of Crustal Dynamics, China Earthquake Administration), 100085 Beijing, China
3
Key Laboratory of Active Tectonics and Volcano, Institute of Geology, China Earthquake Administration, Beijing 100029, China
4
Department of Civil Engineering, Zhejiang University, Hangzhou 310058, Zhejiang, China
earthquake-triggered landslide inventory and hazard assessment is of great significance for landslide disaster prevention and reduction in high-seismic-risk areas. In recent years, such efforts have been made to some major earthquakes around the world, such a
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