Impacts of the October 2012 Magnitude 7.8 Earthquake near Haida Gwaii, Canada

Bird, Alison; Lamontagne, Maurice

doi:10.1785/0120140167

Cited by 12 publications

(4 citation statements)

References 28 publications

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“…The global subduction catalogs also include oblique reverse events with considerable components of thrust that occurred on plate boundaries (Events 23, 26, and 28 in Western Indonesia, Philippines, and North America, respectively) (Ye et al, 2012;Kao et al, 2015). In particular, we included Event 28 (the 2012 M7.8 Haida Gwaii event) in Western Canada, which Hyndman (2015) concluded to be a megathrust event and is the largest thrust event ever recorded near the North Cascadia subduction zone (Bird and Lamontagne, 2015).…”

Section: Earthquake Catalogs Of Global M≥75 Subduction Earthquakesmentioning

confidence: 99%

Variability of ETAS Parameters in Global Subduction Zones and Applications to Mainshock–Aftershock Hazard Assessment

Zhang

Werner

Goda

2020

Bulletin of the Seismological Society of America

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Megathrust earthquake sequences can impact buildings and infrastructure due to not only the mainshock but also the triggered aftershocks along the subduction interface and in the overriding crust. To give realistic ranges of aftershock simulations in regions with limited data and to provide time-dependent seismic hazard information right after a future giant shock, we assess the variability of the epidemic-type aftershock sequence (ETAS) model parameters in subduction zones that have experienced M≥7.5 earthquakes, comparing estimates from long time windows with those from individual sequences. Our results show that the ETAS parameters are more robust if estimated from a long catalog than from individual sequences, given individual sequences have fewer data including missing early aftershocks. Considering known biases of the parameters (due to model formulation, the isotropic spatial aftershock distribution, and finite size effects of catalogs), we conclude that the variability of the ETAS parameters that we observe from robust estimates is not significant, neither across different subduction-zone regions nor as a function of maximum observed magnitudes. We also find that ETAS parameters do not change when multiple M 8.0–9.0 events are included in a region, mainly because an M 9.0 sequence dominates the number of events in the catalog. Based on the ETAS parameter estimates in the long time period window, we propose a set of ETAS parameters for future M 9.0 sequences for aftershock hazard assessment (K0=0.04±0.02, α=2.3, c=0.03±0.01, p=1.21±0.08, γ=1.61±0.29, d=23.48±18.17, and q=1.68±0.55). Synthetic catalogs created with the suggested ETAS parameters show good agreement with three observed M 9.0 sequences since 1965 (the 2004 M 9.1 Aceh–Andaman earthquake, the 2010 M 8.8 Maule earthquake, and the 2011 M 9.0 Tohoku earthquake).

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Section: Earthquake Catalogs Of Global M≥75 Subduction Earthquakesmentioning

confidence: 99%

Variability of ETAS Parameters in Global Subduction Zones and Applications to Mainshock–Aftershock Hazard Assessment

Zhang

Werner

Goda

2020

Bulletin of the Seismological Society of America

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“…1), is prone to heavy rainfall, strong earthquakes, and frequent landslides (Banner et al 2014;Bevington et al 2017). On 27 October 2012, an M w 7.8 earthquake, the second largest instrumentally recorded earthquake in Canada, occurred approximately 20 km off the coast of Haida Gwaii at a depth of 23 km (Rosenberger et al 2013;Bird and Lamontagne 2015). The event was recorded on seismographs across North America and much of the world, and notably on strong motion instruments in Masset, the village of Queen Charlotte where a peak horizontal acceleration of 0.2 g was recorded (Bird and Lamontagne 2015), as well as in Prince Rupert on the adjacent mainland (Fig.…”

Section: Introductionmentioning

confidence: 99%

Landslide response to the 27 October 2012 earthquake (MW 7.8), southern Haida Gwaii, British Columbia, Canada

et al. 2019

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In this paper, we examine the influence of the 27 October 2012, M w 7.8 earthquake on landslide occurrence in the southern half of Haida Gwaii (formerly Queen Charlotte Islands), British Columbia, Canada. Our 1350 km 2 study area is undisturbed, primarily forested terrain that has not experienced road building or timber harvesting. Our inventory of landslide polygons is based on optical airborne and spaceborne images acquired between 2007 and 2018, from which we extracted and mapped 446 individual landslides (an average of 33 landslides per 100 km 2). The landslide rate in years without major earthquakes averages 19.4 per year, or 1.4/100 km 2 /year, and the annual average area covered by nonseismically triggered landslides is 35 ha/year. The number of landslides identified in imagery closely following the 2012 earthquake, and probably triggered by it, is 244 or an average of about 18 landslides per 100 km 2. These landslides cover a total area of 461 ha. In the following years-2013-2016 and 2016-2018-the number of landslides fell, respectively, to 26 and 13.5 landslides per year. In non-earthquake years, most landslides happen on south-facing slopes, facing the prevailing winds. In contrast, during or immediately after the earthquake, up to 32% of the landslides occurred on north and northwest-facing slopes. Although we could not find imagery from the day after the earthquake, overview reconnaissance flights 10 and 16 days later showed that most of the landslides were recent, suggesting they were co-seismic.

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“…The effects of the Haida Gwaii earthquake are summarized by Bird and Lamontagne (2015). In Village of Queen Charlotte, on Haida Gwaii, perceptible shaking lasted for 1.5-2 min and very strong shaking for about 30 s. The earthquake was felt as far away as the Yukon Territory, Alberta, and Montana.…”

Section: Introduction To the Special Issue On The 2012 Haida Gwaii Anmentioning

confidence: 99%

Introduction to the Special Issue on the 2012 Haida Gwaii and 2013 Craig Earthquakes at the Pacific-North America Plate Boundary (British Columbia and Alaska)

James¹,

Cassidy²,

Rogers³

et al. 2015

Bulletin of the Seismological Society of America

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Impacts of the October 2012 Magnitude 7.8 Earthquake near Haida Gwaii, Canada

Cited by 12 publications

References 28 publications

Variability of ETAS Parameters in Global Subduction Zones and Applications to Mainshock–Aftershock Hazard Assessment

Variability of ETAS Parameters in Global Subduction Zones and Applications to Mainshock–Aftershock Hazard Assessment

Landslide response to the 27 October 2012 earthquake (MW 7.8), southern Haida Gwaii, British Columbia, Canada

Introduction to the Special Issue on the 2012 Haida Gwaii and 2013 Craig Earthquakes at the Pacific-North America Plate Boundary (British Columbia and Alaska)

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