Abstract
The 2010/2011 Canterbury earthquake sequence triggered wide-spread rockfall, causing fatalities and damage to property and infrastructure. In response, an area-wide rockfall risk assessment was carried out to understand risk and support the recovery process. The risk assessment influenced zoning decisions, insurance pay-outs and property values and has had a significant impact on the disaster risk reduction process. Site-specific assessments were subsequently carried out on individual residential properties to confirm risk and inform rockfall risk reduction design. The characterization of site-specific rockfall source size, probability of detachment and topographic controls on run-out ultimately controlled rockfall protection structure design for residential properties in the Port Hills. Differences between the assessed level of risk to life between the area-wide and site-specific studies were in many cases two orders of magnitude different, lower and higher. This paper demonstrates the enhancement of the area-wide risk assessment with site specific mapping and source characterization to design rockfall protection structures that balance risk reduction, cost, environmental impact, and visual impact. Understanding the advantages and limitations between area-wide and site-specific rockfall assessments is integral to the disaster response, recovery and rebuild process.
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References
AGS: Guidelines for Landslide Risk Management. Australian Geomechanics Society (2007)
Avery, M., Salzmann, H., Teen, A.: Port Hills 3D Rockfall Modelling. Christchurch, New Zealand, Geovert (2012)
Christchurch City Council: Technical Guideline for Rockfall Protection Structures (2013)
Forsyth, P., Barrell, D., Jongens, R.: Geology of the Christchurch Area. GNS 1:250,000 Map 16 (2008)
Kaiser, A., Holden, C., Beavan, J., Beetham, D., Benites, R., Celentano, A., Collett, D., et al.: The Mw 6.2 Christchurch earthquake of February 2011: preliminary report. N. Z. J. Geol. Geophys. 55(1), 67–90 (2012)
Massey, C.I., McSaveney, M.J., Heron, D., Lukovic, B.: Canterbury earthquakes 2010/11 Port Hills slope stability: pilot study for assessing life-safety risk from rockfalls (boulder rolls). GNS Report 2011/311 (2012a)
Massey, C.I., McSaveney, M.J., Lukovic, B., Heron, D., Ries, W., Moore, A., Carey, J.: Canterbury earthquakes 2010/11 Port Hills slope stability: life-safety risk from rockfalls (boulder rolls) in the Port Hills. GNS Report 2012/123 (2012b)
Massey, C.I., Gerstenberger, M., McVerry, G., Litchfield, N.: Canterbury earthquakes 2010/11 Port Hills slope stability. Additional assessment of the life-safety risk from rockfalls (boulder rolls). GNS Report 2012/214 (2012c)
Massey, C.I., McSaveney, M.J., Taig, T., Richards, L., Litchfield, N.J., Rhoades, D.A., McVerry, G.H., Lukovic, B., Heron, D.W., Ries, W., Van Dissen, R.J.: Determining Rockfall Risk in Christchurch Using Rockfalls Triggered by the 2010-2011 Canterbury Earthquake Sequence. Earthq. Spectra 30(1), 155–181 (2014)
Taig, T., Massey, C., Webb, T.: Canterbury earthquakes Port Hills slope stability: principles and criteria for the assessment of risk from slope instability in the Port Hills, Christchurch. GNS Report 2011/319 (2012)
Townsend, D.B., Rosser, B.: Canterbury earthquakes 2010/2011 Port Hills slope stability: geomorphology mapping for rockfall risk assessment. GNS Report 2012/15 (2012)
Acknowledgements
The authors would like to express thanks to: T. Ging and J. Fitzsimmons (Property Owners), M. and J. Altments (Property Owners), Mark Easton (Opus), I. Wright (CCC), Geotech LTD New Zealand, and James Cox (SMEC).
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Mote, T.I., Skinner, M.D., Taylor, M.L., Lyons, C. (2019). Site-Specific Rockfall Risk Assessments and Rockfall Protection Structure Design Following the 2010/2011 Canterbury Earthquake Sequence. In: Shakoor, A., Cato, K. (eds) IAEG/AEG Annual Meeting Proceedings, San Francisco, California, 2018 - Volume 5. Springer, Cham. https://doi.org/10.1007/978-3-319-93136-4_18
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DOI: https://doi.org/10.1007/978-3-319-93136-4_18
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