... in the form of an uplifted edge of North America, i.e., Haida Gwaii ( Hyndman, 2015 ; Schoettle-Greene et al., 2020 ). Sediments have flowed around the archipelago ( Barrie et al., 2021 ), eroding canyons, gullies, and channels into the adjacent continental shelf and abyssal plain ( Fig. 1 ). Transpression...

... approach to both repeating earthquakes and ambient noise correlations for Haida Gwaii in western Canada, the site of a M w 7.8 thrust earthquake in 2012. Optimal stretch factors for repeating earthquake families indicate that path‐averaged S velocities dropped by up to 0.16% after the earthquake. Ambient...

...M. Riedel; S. Yelisetti; C. Papenberg; K.M.M. Rohr; M.M. Côté; G.D. Spence; R.D. Hyndman; T. James Abstract A well-recorded Mw 7.8 megathrust earthquake occurred on 27 October 2012 under the Queen Charlotte terrace off the west coast of Haida Gwaii, western Canada. In this study, we supplement...

...Philip Schoettle-Greene; Alison R. Duvall; Ann Blythe; Eric Morley; William Matthews; Sean R. LaHusen Abstract The mountainous archipelago of Haida Gwaii abuts the transpressive Pacific–North American plate margin north of the Cascadia subduction zone (northwestern North America). Topography...

...Michael Riedel; Kristin M.M. Rohr; Michelle M. Côté; Ulrike Schmidt; Terryl Richardson Abstract Seismic-reflection data along the Haida Gwaii margin collected from 1967 to 2013 were used to identify gas hydrate–related bottom-simulating reflectors (BSRs). The BSRs occur along the Queen Charlotte...

...Rolf W. Mathewes; Michael Richards; Thomas E. Reimchen The basal portion of a fossil caribou antler from Graham Island is the only evidence of large terrestrial vertebrates older than the Fraser (late-Wisconsin) glaciation on Haida Gwaii. This antler has been radiocarbon dated three times...

...Dariush Motazedian; Yong Zhang; Shutian Ma; Yun-tai Chen Abstract The 28 October 2012 Haida Gwaii, British Columbia, Canada, earthquake with a moment magnitude ( M W ) of 7.8 occurred along an east-dipping poorly known thrust fault beneath the Queen Charlotte Terrace. It was the largest thrust...

...Masao Futakami; James W. Haggart Abstract The early Albian to mid-Albian cosmopolitan genus Douvilleiceras is represented in the Haida Gwaii archipelago of western British Columbia by five species, D . mammillatum (Schlotheim), D . offarcinatum (White), D . scabrosum Casey, D . spiniferum...

... author: Rolf W. Mathewes (e-mail: [email protected] ). 24 2 2015 8 5 2015 Published by NRC Research Press 2015 Fig. 1. Haida Gwaii location map and inset maps showing Cape Ball sample sites and other localities mentioned in the text. Inset map A shows the Cape Ball high sea...

... the performance of the different types of seafloor pressure sensors for long‐period recordings. These tests are performed through analysis of CI seafloor pressure recordings of the 2012 Haida Gwaii tsunami. Seafloor pressure measurements are a central part of tsunami warning systems. Deep‐ocean Assessment...

... ; Millard et al. , 2012 ). Finally, what seemed the greatest disappointment to the majority of people on Haida Gwaii was the drying up of the thermal springs on Hotsprings Island, within the Gwaii Haanas National Park. They had been a popular destination for boaters and kayakers and are considered a sacred...

.... For the Pacific–North American margin along the Queen Charlotte fault, the component of convergence is largest in the south and reaches about 1.5  cm/yr. The Haida Gwaii earthquake occurred on a thrust fault beneath the Queen Charlotte terrace west of Moresby Island, indicating that relative plate motion here...

...R. D. Hyndman Abstract This article provides a summary of the structure and tectonic history of the Queen Charlotte transform fault zone off western Canada, as background to understanding the 2012 M w 7.8 thrust earthquake off Haida Gwaii. There was margin subduction prior to the Eocene. The fault...

...Jeremy M. Gosselin; John F. Cassidy; Stan E. Dosso Abstract The thrust mechanism of the 2012 M w 7.8 Haida Gwaii earthquake suggests convergence across the transpressive Pacific–North America plate boundary in the region is accommodated by underthrusting, with important consequences for seismic...

... broadband stations in the Canadian National Seismograph Network and find that the 2012 M w 7.8 Haida Gwaii and 2013 M w 7.5 Craig, Alaska, earthquakes triggered long duration (>10 s), emergent tremor‐like signals near the southeastern portion of the EDF . In both cases, tremor coincides with the peak...

...Peter J. Haeussler; Robert C. Witter; Kelin Wang Abstract The 28 October 2012 M w 7.8 Haida Gwaii earthquake was a megathrust earthquake along the very obliquely convergent Queen Charlotte margin of British Columbia, Canada. Coseismic deformation is not well constrained by geodesy, with only six...

...Lucinda J. Leonard; Jan M. Bednarski Abstract We describe near‐field coseismic and tsunami evidence collected following the 28 October 2012 M w 7.8 thrust earthquake that occurred offshore western Haida Gwaii, British Columbia, and discuss factors that influence its extent and preservation...

...Honn Kao; Shao‐Ju Shan; Amir Mansour Farahbod Abstract All the significant ( M L ≥4) events in the 2012 Haida Gwaii earthquake sequence are systematically relocated, and their moment tensor solutions are determined from waveform inversion. The focal mechanism of the mainshock shows low‐angle thrust...

...Tiegan E. Hobbs; John F. Cassidy; Stan E. Dosso Abstract This article examines rupture processes of the 28 October 2012 M w 7.8 Haida Gwaii earthquake off the coast of British Columbia, Canada, using an empirical Green’s function ( EGF ) technique. The Haida Gwaii earthquake was the largest event...