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TitleEvaluating ground motion models calculated for Canada with observations from very large earthquakes
AuthorHerrera, C; Cassidy, J FORCID logo; Dosso, S E; Onur, T
SourceCatIQ Connect Canada's Catastrophe Conference, conference proceedings; 2019 p. 16 Open Access logo Open Access
LinksOnline - En ligne
Alt SeriesNatural Resources Canada, Contribution Series 20180372
MeetingCatIQ Connect: Canada's Catastrophe Conference; Toronto, ON; CA; February 4-6, 2019
Mediadigital; on-line
File formatpdf (Adobe® Reader®)
ProvinceBritish Columbia; Western offshore region
NTS92A; 92B
AreaCanada; Chile
Lat/Long WENS-126.0000 -122.0000 49.0000 47.0000
Lat/Long WENS -84.0000 -56.0000 -16.0000 -38.0000
Subjectsgeophysics; Science and Technology; seismology; earthquakes; earthquake magnitudes; earthquake risk; seismicity; seismic risk; building codes; models
ProgramPublic Safety Geoscience Assessing Earthquake Geohazards
Released2019 06 07
An important part of the seismic hazard is the quantification of the ground motion produced by earthquakes. Ground Motion Prediction Equations (GMPE), or attenuation curves, are numerical models that can predict the ground shaking intensity that an earthquake can produce at a site with known geotechnical information.
The world's largest earthquakes occur at subduction zones. That is why seismic hazard assessments in these regions are so important to quantify.
In this context, GMPEs are an essential component in the development of
hazard models for use in building codes. Cascadia and Chile are two subduction zones that pose significant hazard of megathrust earthquakes. The last one in Cascadia occurred in 1700,and estimations suggest an 11% probability of occurrence of another large event in the next 50 years [1]. Conversely, large events have been much more frequent and recent in Chile.
In this work, we compare the ground shaking observations of large earth-quakes in Chile with the GMPE currently used in the National Building Code of Canada, and one of the latest GMPEs developed for Chile, to evaluate their predictive power for large events.
Summary(Plain Language Summary, not published)
Large subduction earthquakes occur along both the coast of Chile, and the Cascadia margin (southwest BC, Washington, Oregon, and Northern California). During the past 8 years, four large (M>7.7) subduction earthquakes have struck the Chilean margin, from the southern end to the north. In this study, we utilise these modern seismic data to assess variations in shaking patterns along the Chilean coast, and we compare with predicted shaking levels currently used in the Chilean Building Code, and the National Building Code of Canada. The goal of this earthquake science is to help engineering design, decision-making, and to mitigate the impact of future earthquakes in the subduction zones of Chile and Canada.

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