Fifth generation seismic hazard model input files as proposed to produce values for the 2015 national building code of Canada

Halchuk, S; Allen, Trevor I.; Adams, J; Rogers, G C

doi:10.4095/293907

Cited by 46 publications

(75 citation statements)

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“…The study areas fall immediately east of the Cochrane South seismic source zone, as defined in the 2015 Canadian seismic hazard model (Halchuk et al ., ). Instrumental and historical seismic records for this zone cover the last 160 years with improving levels of magnitude completeness.…”

Section: Discussionmentioning

confidence: 97%

“…Based on the best estimate of the cumulative earthquake frequency‐magnitude for the zone, an earthquake of M w 5·0 (or larger) has a contemporary return period of ca 1800 years (i.e. ca 0·00055 pa), although with a large uncertainty (Halchuk et al ., ). The palaeoearthquake average frequency of ca 40 vyr exceeds the contemporary return period of a M w 5·0 earthquake by about two orders of magnitude.…”

Section: Discussionmentioning

confidence: 97%

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Deglacial record of palaeoearthquakes interpreted from mass transport deposits at three lakes near Rouyn‐Noranda, north‐western Quebec, Canada

Brooks

2018

Sedimentology

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As part of an investigation of deglacial palaeoseismology within an intracratonic region of north-eastern North America, the compilation of sub-bottom acoustic profile surveys from study areas at Duparquet and Dufresnoy lakes, north-western Quebec, Canada, produced thirteen and eight event horizon maps, respectively, depicting subaqueous mass transport deposits that are interbedded within Lake Ojibway glaciolacustrine varve deposits. Analysis of rhythmic couplets recovered in cores from both locations yielded varve ages with annual resolution for the event horizons relative to the regional Timiskaming varve series. These results are integrated with the published event horizon stratigraphy and varve chronology from nearby Lac Dasserat. The combined event horizon records for the three lakes overlap between varve years 1175 to 1625 (9395 to 8945 AE 200 cal year BP) and consist of 26 event horizons. Fifteen event horizons are inferred to be evidence of 11 palaeoearthquakes at qualitative levels of interpretative confidence varying from high to low. The palaeoearthquake interpretations and assessments of interpretative confidence are made from weightings of the event horizon signatures and, where possible, evidence supporting a stratigraphic footprint extending beyond a given study area. Occurring over a 450 varve year period when rapid crustal uplift was still underway, 11 interpreted palaeoearthquakes happened at an average rate of every ca 40 years. Relative to a published minimum threshold magnitude for generating a recognizable geomorphic signature, this average rate of occurrence exceeds the modern return period by two orders of magnitude. The palaeoearthquakes probably occurred within a period of elevated seismicity associated with rapid crustal unloading during deglaciation.

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Section: Discussionmentioning

confidence: 97%

Section: Discussionmentioning

confidence: 97%

Deglacial record of palaeoearthquakes interpreted from mass transport deposits at three lakes near Rouyn‐Noranda, north‐western Quebec, Canada

Brooks

2018

Sedimentology

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“…The design spectrum with site class C in Victoria and response spectra with median and 16th/84th percentiles of mainshocks and aftershocks are shown in Figure A. Because some large subduction earthquake records (eg, the 2011 Tohoku event with M w 9.0) were recorded hundreds of kilometres away from the record stations, the response spectra of the mainshocks are not strong in comparison with the design spectrum.…”

Section: Methodsmentioning

confidence: 99%

Mainshock‐aftershock state‐dependent fragility curves: A case of wood‐frame houses in British Columbia, Canada

Zhang

Goda

Luca

et al. 2020

Earthq Engng Struct Dyn

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During a mainshock-aftershock (MSAS) sequence, there is no time to retrofit structures that are damaged by a mainshock; therefore, aftershocks could cause additional damage. This study proposes a new approach to develop state-dependent fragility curves using real MSAS records. Specifically, structural responses before and after each event of MSAS sequences are used to obtain statistical relationships among the engineering demand parameter prior to the seismic event (pre-EDP), the intensity measure of the seismic event (IM), and the engineering demand parameter after the seismic event (post-EDP). The developed fragility curves account for damage accumulation, providing the exceeding probability of damage state (DS) given the IM of the event and the DS of the structure prior to the seismic excitation. The UBC-SAWS model, which was developed for wood-frame houses in British Columbia, Canada, is considered as a case study application. Results indicate that for the examined structural typology, state-dependent fragility curves based on residual interstorey drift ratio (pre-EDP), peak ground velocity (IM), and maximum inter-storey drift ratio (post-EDP) are the best choice to characterise the cumulative damage effect. An illustration of the developed fragility curves is provided by considering a hypothetical MSAS scenario of a M w 9.0 Cascadia mainshock triggering a M w 6.0 crustal event in the Leech River fault, affecting wooden houses in Victoria, Canada. The MSAS scenario increases Yellow tags (restricted access) by 12.3% and Red tags (no access) by 4.8%. K E Y W O R D Scloud analysis, multinomial distribution, nonlinear dynamic analysis of wood-frame houses, real mainshock-aftershock sequences, state-dependent aftershock fragility curves /journal/eqe of-freedom system and used the maximum inter-storey drift ratio (MaxISDR) as EDP. Ebrahimian et al (2014) developed a performance-based framework for aftershock risk forecasting, which consists of an epidemic-type aftershock sequence model and event-based aftershock fragility curves. 7 The ground motion records that were constructed for developing event-dependent aftershock fragility curves were selected from the pool of observed aftershock events.The procedure by Luco et al facilitates various postearthquake decision-making, such as building-tagging and seismic loss estimation. However, there are four aspects that can be improved. (1) Since the aftershock records from the back-to-back application are constructed from mainshock records, the link between the prestructural response by the mainshock and the poststructural response by the aftershock is eliminated. Thus, real MSAS records are desirable.(2) The post-EDP may be overestimated, when the back-to-back application of mainshock records is used for aftershock records with IDA. 13 (3) The computational cost of the back-to-back approach with IDA is high. 12 (4) An appropriate set of IMs and EDPs needs to be selected to represent the intensity of ground motions and structural responses, respectively. The spectral accel...

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“…Detailed descriptions of the methodology used for developing the seismic hazard model for NBCC2015 may be found in Adams et al (2015) and in the Geological Survey of Canada (GSC) Open File 7576 (Halchuk et al 2014). A brief overview of the procedure is given below.…”

Section: R a F Tmentioning

confidence: 99%

“…The ground-motion lookup tables for the B/C boundary were converted to ground-motion look-up tables for Site Class C, the reference site adopted by the building code, using the conversion factors in Table 3. These factors are given in the GSC Open File 7576 (Halchuk et al 2014). These amplification factors were developed from the linear soil term in the modified Boore and Atkinson (2008) GMPE using a characteristic velocity for Site Class C, V s30 = 450m/s.…”

Section: R a F Tmentioning

confidence: 99%

An alternative approach to site factors for NBCC 2015

et al. 2016

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The site amplification factors in the 2015 edition of the National Building Code of Canada (NBCC 2015) for South Western British Columbia (SWBC) were developed using only the single site term associated with the ground motion prediction equation (GMPE) for crustal sources. The seismic hazard in SWBC is derived from three source types; crustal, subduction intraplate, and subduction interface sources. Therefore site factors based only on a crustal site term are approximate. This study was conducted to assess the degree of approximation. Alternative site amplification factors for Vancouver and Victoria, British Columbia were calculated using site specific look-up tables incorporating all the GMPEs associated with each seismic source type and their associated site terms. The alternative site factors are significantly greater than those given in NBCC 2015 for periods 0.3 s, 0.5 s, and 1.0 s. These results suggest that the process for calculating site amplification factors should be reassessed by the committee currently reviewing seismic hazard for NBCC 2020.

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Fifth generation seismic hazard model input files as proposed to produce values for the 2015 national building code of Canada

Cited by 46 publications

References 0 publications

Deglacial record of palaeoearthquakes interpreted from mass transport deposits at three lakes near Rouyn‐Noranda, north‐western Quebec, Canada

Deglacial record of palaeoearthquakes interpreted from mass transport deposits at three lakes near Rouyn‐Noranda, north‐western Quebec, Canada

Mainshock‐aftershock state‐dependent fragility curves: A case of wood‐frame houses in British Columbia, Canada

An alternative approach to site factors for NBCC 2015

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