Journal cover Journal topic
Natural Hazards and Earth System Sciences An interactive open-access journal of the European Geosciences Union
https://doi.org/10.5194/nhess-2017-186
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.
Research article
19 Jun 2017
Review status
This discussion paper is under review for the journal Natural Hazards and Earth System Sciences (NHESS).
Detection of collapsed buildings due to the 2016 Kumamoto, Japan, earthquake from Lidar data
Luis Moya1, Fumio Yamazaki2, Wen Liu2, and Masumi Yamada3 1International Research Institute of Disaster Science, Tohoku University, Miyagi, Sendai, 980-0845, Japan
2Department of Urban Environment Systems, Chiba University, Chiba 263-8522, Japan
3Disaster Prevention Research Institute, Kyoto University, Gokasho, Uji, 611-0011, Japan
Abstract. The 2016 Kumamoto earthquake sequence was triggered by an Mw 6.2 event at 21:26 on April 14. Approximately 28 hours later, at 1:25 on April 16, an Mw 7.0 event (the mainshock) followed. The epicenters of both events were located 10 near the residential area of Mashiki town and the region nearby. Due to very strong seismic ground motion, the earthquake produced extensive damage to buildings and infrastructure. In this paper, collapsed buildings were detected using a pair of digital surface models (DSMs), taken before and after the April 16 mainshock by airborne light detection and ranging (Lidar) flights. Different methods for extracting the collapsed buildings from the data were evaluated, and the change of average elevations within a building footprint was found to be the most important feature. Finally, the distribution of collapsed 15 buildings in the study area was presented, and the result was consistent with that of a building damage survey performed after the earthquake.

Citation: Moya, L., Yamazaki, F., Liu, W., and Yamada, M.: Detection of collapsed buildings due to the 2016 Kumamoto, Japan, earthquake from Lidar data, Nat. Hazards Earth Syst. Sci. Discuss., https://doi.org/10.5194/nhess-2017-186, in review, 2017.
Luis Moya et al.
Luis Moya et al.
Luis Moya et al.

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Short summary
On April 14, 2016, an Mw 6.5 earthquake occurred in Kumamoto prefecture, Japan (foreshock). About 28 hours later, another earthquake of Mw 7.0 occurred (mainshock). The earthquake produced extensive losses to the infrastructure. This paper shows the extraction of collapsed buildings from a pair of airborne Lidar data recorded before and after the mainshock. A number of methods were applied and their performances were evaluated by a comparison with actual data obtained from a field survey.
On April 14, 2016, an Mw 6.5 earthquake occurred in Kumamoto prefecture, Japan (foreshock)....
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