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Nat. Hazards Earth Syst. Sci., 18, 321-333, 2018
https://doi.org/10.5194/nhess-18-321-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 3.0 License.
Research article
22 Jan 2018
UAV-based mapping, back analysis and trajectory modeling of a coseismic rockfall in Lefkada island, Greece
Charalampos Saroglou1, Pavlos Asteriou1, Dimitrios Zekkos2, George Tsiambaos1, Marin Clark3, and John Manousakis4 1Department of Geotechnical Engineering, School of Civil Engineering, National Technical University of Athens, Athens, Greece
2Department of Civil and Environmental Engineering, University of Michigan, Ann Arbor, USA
3Department of Earth and Environmental Science, University of Michigan, Ann Arbor, USA
4Elxis Group, S. A., Athens, Greece
Abstract. We present field evidence and a kinematic study of a rock block mobilized in the Ponti area by a Mw  =  6.5 earthquake near the island of Lefkada on 17 November 2015. A detailed survey was conducted using an unmanned aerial vehicle (UAV) with an ultrahigh definition (UHD) camera, which produced a high-resolution orthophoto and a digital terrain model (DTM). The sequence of impact marks from the rock trajectory on the ground surface was identified from the orthophoto and field verified. Earthquake characteristics were used to estimate the acceleration of the rock slope and the initial condition of the detached block. Using the impact points from the measured rockfall trajectory, an analytical reconstruction of the trajectory was undertaken, which led to insights on the coefficients of restitution (CORs). The measured trajectory was compared with modeled rockfall trajectories using recommended parameters. However, the actual trajectory could not be accurately predicted, revealing limitations of existing rockfall analysis software used in engineering practice.

Citation: Saroglou, C., Asteriou, P., Zekkos, D., Tsiambaos, G., Clark, M., and Manousakis, J.: UAV-based mapping, back analysis and trajectory modeling of a coseismic rockfall in Lefkada island, Greece, Nat. Hazards Earth Syst. Sci., 18, 321-333, https://doi.org/10.5194/nhess-18-321-2018, 2018.
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Short summary
The paper presents field evidence and a kinematic study of rock block motion mobilized by a Mw = 6.5 earthquake near the island of Lefkada on 17 November 2015. A detailed survey was conducted using an unmanned aerial vehicle (UAV). Using the impact points from the actual rockfall trajectory, an analytical approach to reconstruct the trajectory was implemented using 2-D, 3-D and kinematic analyses. The actual trajectory could not be accurately predicted, revealing limitations of existing models.
The paper presents field evidence and a kinematic study of rock block motion mobilized by a...
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