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Haida Gwaii earthquake 2012

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Journal Article

Optimal Multichannel Stretch Factors for Estimating Changes in Seismic Velocity: Application to the 2012 M w 7.8 Haida Gwaii Earthquake

Reid J. Merrill, Michael G. Bostock, Simon M. Peacock, David S. Chapman
Published: 08 March 2023
Bulletin of the Seismological Society of America (2023) 113 (3): 1077–1090.
DOI: https://doi.org/10.1785/0120220250
... 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...
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Seismic velocity structure of the Queen Charlotte terrace off western Canada in the region of the 2012 Haida Gwaii Mw 7.8 thrust earthquake

M. Riedel, S. Yelisetti, C. Papenberg, K.M.M. Rohr, M.M. Côté, G.D. Spence, R.D. Hyndman, T. James
Journal: Geosphere
Published: 23 December 2020
Geosphere (2021) 17 (1): 23–38.
DOI: https://doi.org/10.1130/GES02258.1
...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...
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Further studies on the focal mechanism and source rupture process of the 2012 Haida Gwaii, Canada, 7.8 moment magnitude earthquake

Dariush Motazedian, Yong Zhang, Shutian Ma, Yun-tai Chen
Published: 29 January 2016
Canadian Journal of Earth Sciences (2016) 53 (2): 129–139.
DOI: https://doi.org/10.1139/cjes-2015-0119
...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...
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How Scientists’ Communications Helped Mitigate the Psychosocial Effects of the October 2012 Magnitude 7.8 Earthquake near Haida Gwaii, Canada

Alison Bird, Maurice Lamontagne
Published: 15 July 2015
Seismological Research Letters (2015) 86 (5): 1301–1309.
DOI: https://doi.org/10.1785/0220140231
...Alison Bird; Maurice Lamontagne © 2015 by the Seismological Society of America The sparsely populated region of Haida Gwaii, British Columbia, Canada (formerly known as the Queen Charlotte Islands) was struck on 27 October 2012 by a magnitude ( M w ) 7.8 earthquake—the second largest...
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Shear‐Wave Velocity Structure in the Vicinity of the 2012 M w 7.8 Haida Gwaii Earthquake from Receiver Function Inversion

Jeremy M. Gosselin, John F. Cassidy, Stan E. Dosso
Published: 14 April 2015
Bulletin of the Seismological Society of America (2015) 105 (2B): 1106–1113.
DOI: https://doi.org/10.1785/0120140171
...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...
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The Preservation Potential of Coastal Coseismic and Tsunami Evidence Observed Following the 2012 M w 7.8 Haida Gwaii Thrust Earthquake

Lucinda J. Leonard, Jan M. Bednarski
Published: 14 April 2015
Bulletin of the Seismological Society of America (2015) 105 (2B): 1280–1289.
DOI: https://doi.org/10.1785/0120140193
...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...
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Source Characteristics of the 2012 Haida Gwaii Earthquake Sequence

Honn Kao, Shao‐Ju Shan, Amir Mansour Farahbod
Published: 07 April 2015
Bulletin of the Seismological Society of America (2015) 105 (2B): 1206–1218.
DOI: https://doi.org/10.1785/0120140165
...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...
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Rupture Process of the 2012 M w 7.8 Haida Gwaii Earthquake from an Empirical Green’s Function Method

Tiegan E. Hobbs, John F. Cassidy, Stan E. Dosso
Published: 07 April 2015
Bulletin of the Seismological Society of America (2015) 105 (2B): 1219–1230.
DOI: https://doi.org/10.1785/0120140175
...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...
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GPS Observations of Crustal Deformation Associated with the 2012 M w 7.8 Haida Gwaii Earthquake

Lisa Nykolaishen, Herb Dragert, Kelin Wang, Thomas S. James, Michael Schmidt
Published: 07 April 2015
Bulletin of the Seismological Society of America (2015) 105 (2B): 1241–1252.
DOI: https://doi.org/10.1785/0120140177
...Lisa Nykolaishen; Herb Dragert; Kelin Wang; Thomas S. James; Michael Schmidt Abstract On 28 October 2012, an M w 7.8 earthquake occurred off the west coast of Haida Gwaii, British Columbia. Although past large events at this margin reflect strike‐slip motion between the Pacific and North American...
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Coulomb Stress Changes Following the 2012 M w 7.8 Haida Gwaii, Canada, Earthquake: Implications for Seismic Hazard

T. E. Hobbs, J. F. Cassidy, S. E. Dosso, C. Brillon
Published: 07 April 2015
Bulletin of the Seismological Society of America (2015) 105 (2B): 1253–1264.
DOI: https://doi.org/10.1785/0120140158
...T. E. Hobbs; J. F. Cassidy; S. E. Dosso; C. Brillon Abstract This article examines spatial changes to the local stress field resulting from the 28 October 2012, M w 7.8 Haida Gwaii earthquake, off the west coast of Moresby Island, British Columbia. This event occurred on a northeast‐dipping...
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Thermal Condition of the 27 October 2012 M w 7.8 Haida Gwaii Subduction Earthquake at the Obliquely Convergent Queen Charlotte Margin

Kelin Wang, Jiangheng He, Franziska Schulzeck, Roy D. Hyndman, Michael Riedel
Published: 07 April 2015
Bulletin of the Seismological Society of America (2015) 105 (2B): 1290–1300.
DOI: https://doi.org/10.1785/0120140183
...Kelin Wang; Jiangheng He; Franziska Schulzeck; Roy D. Hyndman; Michael Riedel Abstract The 2012 M w 7.8 Haida Gwaii earthquake confirmed very oblique subduction and slip partitioning at the southern Queen Charlotte margin. In this study, we re‐examine the thermal regime near the earthquake using...
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Impacts of the October 2012 Magnitude 7.8 Earthquake near Haida Gwaii, Canada

Alison L. Bird, Maurice Lamontagne
Published: 03 March 2015
Bulletin of the Seismological Society of America (2015) 105 (2B): 1178–1192.
DOI: https://doi.org/10.1785/0120140167
...Alison L. Bird; Maurice Lamontagne Abstract On 27 October 2012, a magnitude ( M w ) 7.8 earthquake occurred in the sparsely populated region of Haida Gwaii, British Columbia, Canada (formerly called the Queen Charlotte Islands). This was the second largest recorded earthquake in Canadian history...
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Tsunami waveforms from 28 October <span class="search-highlight">2012</span> <span class="search-highlight">Haida</span> <span class="search-highlight">Gwaii</span> <span class="search-highlight">earthquake</span> recorded on a...

Tsunami waveforms from 28 October 2012 Haida Gwaii earthquake recorded on a...

Published: 19 August 2015
Figure 3. Tsunami waveforms from 28 October 2012 Haida Gwaii earthquake recorded on a subset of DART and CI ocean‐bottom pressure recorders. Black curves indicate seafloor pressure records with instrument response removed and converted to water height and red curves indicate simulated
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Map of <span class="search-highlight">Haida</span> <span class="search-highlight">Gwaii</span> region showing epicenter of <span class="search-highlight">2012</span> M w  7.8 <span class="search-highlight">earthquake</span> d...

Map of Haida Gwaii region showing epicenter of 2012 M w  7.8 earthquake d...

Published: 14 April 2015
Figure 2. Map of Haida Gwaii region showing epicenter of 2012 M w  7.8 earthquake determined by the USGS (star), Global Positioning System ( GPS ) sites (triangles), and biological indicator sites of this study (squares). The Sandspit GPS site (BCSS) is continuously recording, whereas
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Aftershocks of the <span class="search-highlight">2012</span> M w  7.8 <span class="search-highlight">Haida</span> <span class="search-highlight">Gwaii</span> thrust <span class="search-highlight">earthquake</span> (after Ca...

Aftershocks of the 2012 M w  7.8 Haida Gwaii thrust earthquake (after Ca...

Published: 14 April 2015
Figure 15. Aftershocks of the 2012 M w  7.8 Haida Gwaii thrust earthquake (after Cassidy et al. , 2014 ). They approximately define the rupture area. The normal‐faulting mechanisms for two of the larger aftershocks are also shown. Many of the aftershocks are within the incoming oceanic plate
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Moment tensor inversion result for the <span class="search-highlight">2012</span> <span class="search-highlight">Haida</span> <span class="search-highlight">Gwaii</span> <span class="search-highlight">earthquake</span> mainshoc...

Moment tensor inversion result for the 2012 Haida Gwaii earthquake mainshoc...

Published: 07 April 2015
Figure 3. Moment tensor inversion result for the 2012 Haida Gwaii earthquake mainshock. (a) Source parameters are summarized on the top with a map showing the epicentral location and the focal mechanism. The misfit versus depth plot demonstrates that the best depth is 21 km. Observed
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Schematic image of mainshock rupture for <span class="search-highlight">2012</span> <span class="search-highlight">Haida</span> <span class="search-highlight">Gwaii</span> <span class="search-highlight">earthquake</span>, using...

Schematic image of mainshock rupture for 2012 Haida Gwaii earthquake, using...

Published: 07 April 2015
Figure 9. Schematic image of mainshock rupture for 2012 Haida Gwaii earthquake, using distances and strikes from combined Rayleigh‐ and Love‐wave results (Table  2 ). The solid arrows denote time periods discussed in text: O–T1, T1–T2, and T2–E. The dashed arrow is for the total pulse width (O–E
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Regional tectonics and the <span class="search-highlight">2012</span> <span class="search-highlight">Haida</span> <span class="search-highlight">Gwaii</span> <span class="search-highlight">earthquake</span>. (a) Tectonics of th...

Regional tectonics and the 2012 Haida Gwaii earthquake. (a) Tectonics of th...

Published: 07 April 2015
Figure 1. Regional tectonics and the 2012 Haida Gwaii earthquake. (a) Tectonics of the Queen Charlotte margin and large historical earthquakes. Inset shows plate boundaries of a larger area and the location of the map area. QCF , Queen Charlotte fault; CSZ, Cascadia subduction zone. Strike‐slip
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Map showing the source region of the <span class="search-highlight">2012</span> <span class="search-highlight">Haida</span> <span class="search-highlight">Gwaii</span> <span class="search-highlight">earthquake</span> sequence. ...

Map showing the source region of the 2012 Haida Gwaii earthquake sequence. ...

Published: 07 April 2015
Figure 1. Map showing the source region of the 2012 Haida Gwaii earthquake sequence. The solid star marks the relocated epicenter of the mainshock. The triangles are seismograph stations used in the relocation (geographic coordinates are listed in Table  1 ). The Queen Charlotte terrace ( QCT
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Relocation results of the <span class="search-highlight">2012</span> <span class="search-highlight">Haida</span> <span class="search-highlight">Gwaii</span> <span class="search-highlight">earthquake</span> sequence. (a) Relocat...

Relocation results of the 2012 Haida Gwaii earthquake sequence. (a) Relocat...

Published: 07 April 2015
Figure 2. Relocation results of the 2012 Haida Gwaii earthquake sequence. (a) Relocated epicenters of the mainshock and significant aftershocks are marked by the star and open circles, respectively. Event numbers correspond to Table  3 . The detailed distribution of three aftershock clusters (G1