doi: https://doi.org/10.1785/0120140165. There have been no reports of damage at this time. There have been no reports of damage at this time. [2] This earthquake did not have any major impacts, except for the temporary cessation of the hotsprings on Hotspring Island. The 2012 M w7.7 Haida Gwaii earthquake was a thrust event that generated a tsunami with significant run up of over 7 m in several inlets on the west coast of Moresby Island (several over 6 m, with a maximum of 13 m). A tsunami warning was issued for the coastal areas. More recently the M 7.8 Haida Gwaii earthquake struck adjacent to the south-central portion of the islands on October 28, 2012, and was characterized by oblique thrust faulting, triggering a locally significant tsunami. Deep-Sea Research Part II: Topical Studies in Oceanography 104, 83–92. [1], Four large earthquakes have occurred along the Queen Charlotte Fault within the last hundred years: a magnitude 7 event in 1929, a magnitude 8.1 occurred in 1949 (Canada's largest recorded earthquake since the 1700 Cascadia earthquake) a magnitude 7.4 in 1970 and a magnitude 7.8 on Oct 27 2012. Aftershocks as large as 6.3 were reported. Bulletin of the Seismological Society of America, Late Quaternary Climate, Tectonism, and Sedimentation in Clear Lake, Northern California Coast Ranges, The 2011 Mineral, Virginia, Earthquake, and Its Significance for Seismic Hazards in Eastern North America, Continental Intraplate Earthquakes: Science, Hazard, and Policy Issues, Seismotectonics of the Central California Coast Ranges, This site uses cookies. 2013; Bird and Lamontagne 2015 ). You do not currently have access to this article. A major earthquake occurred in the Haida Gwaii region. 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 fault is named for the Queen Charlotte Islands (now Haida Gwaii) which lie just north of the triple junction. Several normal and strike‐slip events at greater depths within the subducted Pacific slab show a consistent pattern of T‐axis in the down‐dip direction, implying the subducted plate is under a stress regime of down‐dip extension. This was the biggest quake in Canadian territory since 1949. Geo-Marine Letters 33, 311–318. [4] Recent detailed seafloor mapping has revealed the expression of the Queen Charlotte Fault on the seafloor[5] including the truncation of submarine canyons that occur along the continental slope. The majority of these events show normal‐faulting mechanisms that are probably associated with the bending stress within the Pacific plate near the deformation front. Significant aftershocks appear to cluster on the periphery of the main rupture zone with most events located immediately seaward of the deformation front. Harris, P.T., Barrie, J.V., Conway, K.W., Greene, G.H., 2014. Haida Gwaii (/ ˈ h aɪ d ə ˈ ɡ w aɪ /; Haida: X̱aaydag̱a Gwaay.yaay / X̱aayda gwaay, literally "Islands of the Haida people") is an archipelago located between 55–125 km (34–78 mi) off the northern Pacific coast of Canada.The islands are separated from the mainland to the east by the shallow Hecate Strait. Search for other works by this author on: Bulletin of the Seismological Society of America (2015) 105 (2B): 1206–1218. West Coast and Alaska Tsunami Warning Center. Honn Kao, Shao‐Ju Shan, Amir Mansour Farahbod; Source Characteristics of the 2012 Haida Gwaii Earthquake Sequence. By continuing to use our website, you are agreeing to our, Assessment of Ground‐Motion Models for Use in the British Columbia North Coast Region, Canada, GPS Observations of Crustal Deformation Associated with the 2012, Basement and Regional Structure Along Strike of the Queen Charlotte Fault in the Context of Modern and Historical Earthquake Ruptures, Impacts of the October 2012 Magnitude 7.8 Earthquake near Haida Gwaii, Canada, Tectonics and Structure of the Queen Charlotte Fault Zone, Haida Gwaii, and Large Thrust Earthquakes, Seismicity in the Clear Lake area, California, 1975–1983, Geologic framework and evidence for neotectonism in the epicentral area of the 2011 Mineral, Virginia, earthquake, Geomorphic evidence for persistent, cumulative deformation of the Virginia Piedmont in the vicinity of the 23 August 2011 Mineral earthquake, Effects of a lithospheric weak zone on postglacial seismotectonics in eastern Canada and the northeastern United States, Seismotectonic framework of coastal central California, Shallow geologic structure, offshore Point Arguello to Santa Maria River; central California, Copyright © 2020 Seismological Society of America. There have been no reports of damage at this time. [6], CBC Newsworld, "7.7 Magnitude Quake Breaking News Special", airdate: 27–28 October 2012.

The Queen Charlotte Fault, British Columbia: seafloor anatomy of a transform fault and its influence on sediment processes. Major strike‐slip earthquakes are likely to occur along the southernmost part of the QCF system in the future. The Queen Charlotte Fault forms a triple junction on its south with the Cascadia subduction zone and the Explorer Ridge (the Queen Charlotte Triple Junction).

It was felt across much of north-central BC, including Haida Gwaii, Prince Rupert, Quesnel, and Houston. Barrie, J.V., Conway, K., Harris, P.T., 2013. All the significant (ML≥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 faulting along a shallowly dipping plane with a strike parallel to the Queen Charlotte fault (QCF), consistent with the inference of Pacific plate … The two segments are collectively called the Queen Charlotte-Fairweather Fault System. It was felt across much of north-central BC, including Haida Gwaii, Prince Rupert, Quesnel, and Houston. Numerous aftershocks of M3 to ~5 in the hours following. Numerous aftershocks of M3 to ~5 in the hours following. The 1949 earthquake was larger than the 1906 San Francisco earthquake, causing nearly a 500 kilometre long segment of the Queen Charlotte Fault to break. Hanging canyons of Haida Gwaii, British Columbia, Canada: Fault-control on submarine canyon geomorphology along active continental margins. The spring seems to have returned to borderline nominal functioning as of July 2014. The limited size and distribution of these events suggest that most of the elastic strain accumulated along the QCF was not released during the 2012 Haida Gwaii sequence. It is Canada's right-lateral strike-slip equivalent to the San Andreas Fault to the south in California. Haida Gwaii's Hotsprings Island showing signs of recovery, "Superquakes, supercycles, and global earthquake clustering: Recent research and recent quakes reveal surprises in major fault systems", Queen Charlotte-Fairweather Fault System – Alaska Earthquake Information Center, https://en.wikipedia.org/w/index.php?title=Queen_Charlotte_Fault&oldid=975302987#Significant_earthquakes_along_the_fault, Pacific Ocean articles missing geocoordinate data, Creative Commons Attribution-ShareAlike License, This page was last edited on 27 August 2020, at 20:14. The P nodal focal mechanism for the 1949 earthquake indicates a virtually pure strike-slip movement with a northwest striking nodal plane corresponding to the strike of the fault. Approximate Location of Earthquake: A major earthquake occurred in the Haida Gwaii region. A tsunami warning was issued for the coastal areas.West Coast and Alaska Tsunami Warning Center. You could not be signed in. [3], This quake was remarkable for having been a thrust, and not a strike-slip tremor, more like the mechanism of the Cascadia Subduction Zone to the south. Only a few strike‐slip events were observed along or near the QCF. Numerous aftershocks of M3 to ~5 in the hours following. Queen Charlotte Sound lies to the south, with Vancouver Island beyond. A 7.8 magnitude quake struck off the western coast of Haida Gwaii at around 8:10pm Pacific Time on Saturday 27 October 2012.

Please check your email address / username and password and try again. The study of the Queen Charlotte Fault affords further important information applicable to other similar faults throughout the world. The 1970 earthquake did however show a similar strike-slip movement with a small but significant thrust component, consistent with relative plate motion. Also at the School of Earth and Ocean Sciences, University of Victoria, British Columbia, Canada. The fault has been the source of large, very large, and great earthquakes. The Queen Charlotte Fault continues northward along the Alaskan coast where it is called the Fairweather Fault. The October 28, 2012 (October 27 at the location of the epicenter), M 7.7 earthquake offshore of the island of Haida Gwaii, Canada, occurred as a result of shallow, oblique-thrust faulting near the plate boundary between the Pacific and North America plates. Approximate Location of Earthquake: A major earthquake occurred in the Haida Gwaii region. It was felt across much of north-central BC, including Haida Gwaii, Prince Rupert, Quesnel, and Houston. Damage from this earthquake and tsunami was minor due to the lack of population and vulnerable structures on this coast. 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. The Queen Charlotte Fault is an active transform fault that marks the boundary of the North American and the Pacific Plates. The focal mechanism of the mainshock shows low‐angle thrust faulting along a shallowly dipping plane with a strike parallel to the Queen Charlotte fault (QCF), consistent with the inference of Pacific plate underthrusting beneath the overriding North American plate. Bulletin of the Seismological Society of America ; 105 (2B): 1206–1218. The epicenter of the mainshock is located ∼5  km landward (northeast) of the surface trace of the QCF, suggesting the nucleation of the rupture was near the bottom of the seismogenic (locked) interface. Four large earthquakes have occurred along the Queen Charlotte Fault within the last hundred years: a magnitude 7 event in 1929, a magnitude 8.1 occurred in 1949 (Canada's largest recorded earthquake since the 1700 Cascadia earthquake) a magnitude 7.4 in 1970 and a magnitude 7.8 on Oct 27 2012 Alerts were sent across the Pacific Basin.



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