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Open AccessArticle

Detection of Earthquake-Induced Landslides during the 2018 Kumamoto Earthquake Using Multitemporal Airborne Lidar Data

1
Graduated School of Engineering, Chiba University, Chiba, Chiba 263-8522, Japan
2
National Research Institute for Earth Science and Disaster Resilience, Tsukuba, Ibaraki 305-0006, Japan
*
Author to whom correspondence should be addressed.
Remote Sens. 2019, 11(19), 2292; https://doi.org/10.3390/rs11192292
Received: 29 August 2019 / Revised: 23 September 2019 / Accepted: 27 September 2019 / Published: 1 October 2019
A series of earthquakes hit Kumamoto Prefecture, Japan, continuously over a period of two days in April 2016. The earthquakes caused many landslides and numerous surface ruptures. In this study, two sets of the pre- and post-event airborne Lidar data were applied to detect landslides along the Futagawa fault. First, the horizontal displacements caused by the crustal displacements were removed by a subpixel registration. Then, the vertical displacements were calculated by averaging the vertical differences in 100-m grids. The erosions and depositions in the corrected vertical differences were extracted using the thresholding method. Slope information was applied to remove the vertical differences caused by collapsed buildings. Then, the linked depositions were identified from the erosions according to the aspect information. Finally, the erosion and its linked deposition were identified as a landslide. The results were verified using truth data from field surveys and image interpretation. Both the pair of digital surface models acquired over a short period and the pair of digital terrain models acquired over a 10-year period showed good potential for detecting 70% of landslides. View Full-Text
Keywords: landslides; airborne Lidar data; digital surface model; digital terrain model; crustal displacements landslides; airborne Lidar data; digital surface model; digital terrain model; crustal displacements
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Liu, W.; Yamazaki, F.; Maruyama, Y. Detection of Earthquake-Induced Landslides during the 2018 Kumamoto Earthquake Using Multitemporal Airborne Lidar Data. Remote Sens. 2019, 11, 2292.

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