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TitleMonitoring shaking in Canada's cities: before, during and after an earthquake
AuthorCassidy, J; Rogers, G; McCormack, D; Huffman, S; Bolton, M
Source4th Annual Canadian Risk and Hazards Network Symposium: abstracts and biographical sketches; 2007 p. 11
Alt SeriesEarth Sciences Sector, Contribution Series 20070073
PublisherCRHNet (Canada)
Meeting4th Annual Canadian Risk and Hazards Network Symposium; Vancouver, BC; CA; November 6-8, 2007
Mediapaper; on-line; digital
File formatpdf (Adobe® Reader®)
ProgramReducing Risk from Natural Hazards
ProgramCanadian Hazard Information Service
LinksOnline - En ligne (page 11)
AbstractRapid advances in technology, and decreasing costs of data collection and transmission are providing a wealth of new opportunities in
earthquake monitoring and mitigation. The collection of ground shaking data from low-cost strong motion seismographs deployed in
urban centres is providing critical new information that is useful before, during, and after an earthquake. Before an earthquake, recordings of "seismic background noise" and small earthquakes, combined with geological and geotechnical information can be used to identify "seismic hot-spots" - areas that may have a potential for stronger shaking. During an earthquake, seismic data from a dense urban network can be used to produce "shaking maps" - which will identify the hardest hit areas. After an earthquake, exact measurements of the strength and duration of the ground shaking at specific sites (e.g., bridges, hospitals, schools) can be used for engineering assessment
of structure safety. One of Natural Resources Canada's key target areas for urban seismic monitoring is southwest British Columbia. The
core of the new urban seismic network is the "Internet Accelerometer" - a low-cost (about $3000) instrument that transmits data in realtime
via the Internet. Immediately after an earthquake, peak-ground shaking levels are computed and sent to clients. Currently, NRCan and BC Ministry of Transportation operate 114 IA's as a technology demonstration in southwest BC. New partners are being sought to expand and densify the network in order to produce improved "shaking maps" and to provide direct assessment of critical facilities, and vital information for business continuity.