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Triggered seismic events along the eastern Denali Fault in northwest Canada following the 2012 Mw 7.8 Haida Gwaii, 2013 Mw 7.5 Craig, and two Mw>8.5 teleseismic earthquakes

Chastity Aiken, Jessica P. Zimmerman, Zhigang Peng and Jacob I. Walter
Triggered seismic events along the eastern Denali Fault in northwest Canada following the 2012 Mw 7.8 Haida Gwaii, 2013 Mw 7.5 Craig, and two Mw>8.5 teleseismic earthquakes (in 2012 Haida Gwaii and 2013 Craig earthquakes at the Pacific North America plate boundary (British Columbia and Alaska), Thomas S. James (editor), John F. Cassidy (editor), Garry C. Rogers (editor) and Peter J. Haeussler (editor))
Bulletin of the Seismological Society of America (May 2015) 105 (2B): 1165-1177

Abstract

We conduct a systematic search for remotely triggered seismic activity along the eastern Denali fault (EDF) in northwest Canada, an intraplate strike-slip region. We examine 19 distant earthquakes recorded by nine broadband stations in the Canadian National Seismograph Network and find that the 2012 M (sub w) 7.8 Haida Gwaii and 2013 M (sub 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 transverse velocities, consistent with Love-wave triggering on right-lateral strike-slip faults. The 2011 M (sub w) 9.0 Tohoku-Oki and 2012 M (sub w) 8.6 Indian Ocean earthquakes possibly triggered tremor signals, although we were unable to locate those sources. In addition, we also identify many short-duration (<5 s) bursts that were repeatedly triggered by the Rayleigh waves of the 2012 M (sub w) 7.8 Haida Gwaii earthquake. Although we were unable to precisely locate the short-duration (<5 s) events, they appear to be radiating from the direction of the Klutlan Glacier and from a belt of shallow historical seismicity at the eastern flank of the Wrangell-St. Elias mountain range. The fact that these events were triggered solely by the Rayleigh waves suggests a different source mechanism as compared with triggered tremor observed along the EDF and other plate boundary regions.Online Material: Description of Rayleigh-wave polarization detection; figures of spectograms, S-wave amplitudes, polarization analysis, and static stress changes; tables of earthquake catalogs and velocity model; and animations of tremors and bursts.


ISSN: 0037-1106
EISSN: 1943-3573
Coden: BSSAAP
Serial Title: Bulletin of the Seismological Society of America
Serial Volume: 105
Serial Issue: 2B
Title: Triggered seismic events along the eastern Denali Fault in northwest Canada following the 2012 Mw 7.8 Haida Gwaii, 2013 Mw 7.5 Craig, and two Mw>8.5 teleseismic earthquakes
Title: 2012 Haida Gwaii and 2013 Craig earthquakes at the Pacific North America plate boundary (British Columbia and Alaska)
Author(s): Aiken, ChastityZimmerman, Jessica P.Peng, ZhigangWalter, Jacob I.
Author(s): James, Thomas S.editor
Author(s): Cassidy, John F.editor
Author(s): Rogers, Garry C.editor
Author(s): Haeussler, Peter J.editor
Affiliation: Georgia Institute of Technology, School of Earth and Atmospheric Sciences, Athens, GA, United States
Affiliation: Geological Survey of Canada, Pacific Geoscience Centre, Natural Resources Canada,, Sidney, BC, Canada
Pages: 1165-1177
Published: 201505
Text Language: English
Publisher: Seismological Society of America, Berkeley, CA, United States
References: 51
Accession Number: 2015-085127
Categories: Seismology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. geol. sketch maps
N59°00'00" - N64°00'00", W148°00'00" - W136°00'00"
Secondary Affiliation: U. S. Geological Survey, USA, United StatesUniversity of Alaska, USA, United StatesUniversity of Texas, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, Copyright, Seismological Society of America. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201536
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