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Assessment of ground-motion models for use in the British Columbia north coast region, Canada

Trevor I. Allen and Camille Brillon
Assessment of ground-motion models for use in the British Columbia north coast region, Canada (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): 1193-1205

Abstract

The 28 October 2012 M (sub w) 7.8 Haida Gwaii earthquake was the second largest earthquake instrumentally recorded in Canada's territory and was strongly felt across the British Columbia north coast (BCNC) region. Data from the Haida Gwaii sequence and other events in the region are compiled for 56 earthquakes between moment magnitude M (sub w) 4.6 and 7.8 that occurred between 1996 and 2014. Pseudospectral accelerations (PSA) at 5% damping are calculated and compared against several modern ground-motion models (GMMs) using different binning criteria (e.g., distance, magnitude, mechanism, source-to-site azimuth, and event chronology). Overall, no single model is found to be appropriate for the BCNC region, with GMMs generally overestimating recorded near-source (i.e., <100 km) ground motions by factors of 2 or more across most of the spectral period range.Earthquake motions recorded prior to and including the 2012 M (sub w) 7.8 earthquake were generally more comparable with some GMMs at longer spectral periods but still possessed significant biases based on residual analyses. Additionally, earthquakes with normal mechanisms gave less short-to-mid-period shaking relative to strike- and reverse-slip events.


ISSN: 0037-1106
EISSN: 1943-3573
Coden: BSSAAP
Serial Title: Bulletin of the Seismological Society of America
Serial Volume: 105
Serial Issue: 2B
Title: Assessment of ground-motion models for use in the British Columbia north coast region, Canada
Title: 2012 Haida Gwaii and 2013 Craig earthquakes at the Pacific North America plate boundary (British Columbia and Alaska)
Author(s): Allen, Trevor I.Brillon, Camille
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: Natural Resources Canada, Pacific Geoscience Centre, Sidney, BC, Canada
Affiliation: Geological Survey of Canada, Pacific Geoscience Centre, Natural Resources Canada,, Sidney, BC, Canada
Pages: 1193-1205
Published: 201505
Text Language: English
Publisher: Seismological Society of America, Berkeley, CA, United States
References: 78
Accession Number: 2015-085129
Categories: Seismology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 2 tables, geol. sketch maps
N52°00'00" - N54°15'00", W133°10'00" - W131°00'00"
Secondary Affiliation: U. S. Geological Survey, 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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