Determining Rockfall Risk in Christchurch Using Rockfalls Triggered by the 2010–2011 Canterbury Earthquake Sequence
| Autor: | William Ries, Laurie Richards, Graeme McVerry, Chris Massey, Biljana Lukovic, Nicola Litchfield, Mauri McSaveney, David Heron, Tony Taig, Russ Van Dissen, David A. Rhoades |
|---|---|
| Rok vydání: | 2014 |
| Předmět: |
021110 strategic
defence & security studies geography geography.geographical_feature_category 0211 other engineering and technologies 02 engineering and technology 010502 geochemistry & geophysics Geotechnical Engineering and Engineering Geology 01 natural sciences Port (computer networking) Sequence (geology) Geophysics Rockfall Seismology Geology 0105 earth and related environmental sciences |
| Zdroj: | Earthquake Spectra. 30:155-181 |
| ISSN: | 1944-8201 8755-2930 |
| DOI: | 10.1193/021413eqs026m |
| Popis: | The Canterbury earthquake sequence triggered thousands of rockfalls in the Port Hills of Christchurch, New Zealand, with over 6,000 falling on 22 February 2011. Several hundred families were evacuated after about 200 homes were hit. We characterized the rockfalls by boulder-size distribution, runout distance, source-area dimensions, and boulder-production rates over a range of triggering peak ground accelerations. Using these characteristics, a time-varying seismic hazard model for Canterbury, and estimates of residential occupancy rates and resident vulnerability, we estimated annual individual fatality risk from rockfall in the Port Hills. The results demonstrate the Port Hills rockfall risk is time-variable, decreasing as the seismic hazard decreases following the main earthquakes in February and June 2011. This presents a real challenge for formulating robust land-use and reconstruction policy in the Port Hills. |
| Databáze: | OpenAIRE |
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