期刊
NATURAL HAZARDS AND EARTH SYSTEM SCIENCES
卷 18, 期 1, 页码 321-333出版社
COPERNICUS GESELLSCHAFT MBH
DOI: 10.5194/nhess-18-321-2018
关键词
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资金
- National Science Foundation (NSF) [CMMI-1362975]
- USGS National Earthquake Hazards Reduction Program (NEHRP) [G17AP00088]
- University of Michigan (MCUBED 2.0)
- Division of Civil and Mechanical Systems
We present field evidence and a kinematic study of a rock block mobilized in the Ponti area by a M-w = 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.
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