Journal cover Journal topic
Natural Hazards and Earth System Sciences An interactive open-access journal of the European Geosciences Union
Nat. Hazards Earth Syst. Sci., 18, 65-78, 2018
https://doi.org/10.5194/nhess-18-65-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 3.0 License.
Research article
04 Jan 2018
Detection of collapsed buildings from lidar data due to the 2016 Kumamoto earthquake in Japan
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 14 April. Approximately 28 h later, at 01:25 on 16 April, an Mw 7.0 event (the mainshock) followed. The epicenters of both events were located near the residential area of Mashiki and affected 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 16 April mainshock by airborne light detection and ranging (lidar) flights. Different methods were evaluated to identify collapsed buildings from the DSMs. The change in average elevation within a building footprint was found to be the most important factor. Finally, the distribution of collapsed 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 from lidar data due to the 2016 Kumamoto earthquake in Japan, Nat. Hazards Earth Syst. Sci., 18, 65-78, https://doi.org/10.5194/nhess-18-65-2018, 2018.
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Short summary
On 14 April 2016, an Mw 6.5 earthquake occurred in Kumamoto prefecture, Japan (foreshock). About 28 h 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 comparison with actual data obtained from a field survey.
On 14 April 2016, an Mw 6.5 earthquake occurred in Kumamoto prefecture, Japan (foreshock). About...
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