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Identifying Active Structures using Double-Difference Earthquake Relocations in Southwest British Columbia and the San Juan islands, Washington

Balfour, Natalie; Cassidy, J.F.; Dosso, S.E.

Description

This paper applies double-difference earthquake relocation techniques to investigate sources of seismicity in southwest British Columbia, Canada, and the San Juan Islands, Washington. The study area is a complex region of deformation and has the potential for large earthquakes in the North Americancrust. Double-difference earthquake relocation techniques are applied to identify otherwise-hidden active structures that may pose a hazard to nearby population and infrastructure. We present evidence...[Show more]

dc.contributor.authorBalfour, Natalie
dc.contributor.authorCassidy, J.F.
dc.contributor.authorDosso, S.E.
dc.date.accessioned2015-12-10T21:56:34Z
dc.identifier.issn0037-1106
dc.identifier.urihttp://hdl.handle.net/1885/39492
dc.description.abstractThis paper applies double-difference earthquake relocation techniques to investigate sources of seismicity in southwest British Columbia, Canada, and the San Juan Islands, Washington. The study area is a complex region of deformation and has the potential for large earthquakes in the North Americancrust. Double-difference earthquake relocation techniques are applied to identify otherwise-hidden active structures that may pose a hazard to nearby population and infrastructure. We present evidence for previously unrecognized active structures using precise relative earthquake relocations obtained using both catalog and waveform cross-correlation data. Results have significantly reduced errors over routine catalog locations and show lineations in areas of clustered seismicity. In southwest British Columbia, these lineations or streaks appear to be hidden structures that do not disrupt near-surface sediments; however, in the San Juan Islands the identified lineation could be related to recently mapped surface expressions of faults identified from seismic reflection and multibeam bathymetric surveys. We use a variety of velocity models for the relocations and find that inappropriate models lead to artifacts at layer boundaries and increased vertical errors.
dc.publisherSeismological Society of America
dc.sourceBulletin of the Seismological Society of America
dc.subjectKeywords: Active structures; Bathymetric survey; British Columbia; British Columbia , Canada; Cross correlations; Earthquake relocation; Hidden structures; Layer boundaries; Multi-beam; Near-surface; Seismic reflections; Study areas; Surface expression; Velocity mo
dc.titleIdentifying Active Structures using Double-Difference Earthquake Relocations in Southwest British Columbia and the San Juan islands, Washington
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume102
dc.date.issued2012
local.identifier.absfor040407 - Seismology and Seismic Exploration
local.identifier.ariespublicationu4278572xPUB178
local.type.statusPublished Version
local.contributor.affiliationBalfour, Natalie, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationCassidy, J.F., University of Victoria
local.contributor.affiliationDosso, S.E., University of Victoria
local.description.embargo2037-12-31
local.bibliographicCitation.issue2
local.bibliographicCitation.startpage639
local.bibliographicCitation.lastpage649
local.identifier.doi10.1785/0120110056
local.identifier.absseo970104 - Expanding Knowledge in the Earth Sciences
dc.date.updated2016-02-24T10:48:45Z
local.identifier.scopusID2-s2.0-84859187982
local.identifier.thomsonID000302071800013
CollectionsANU Research Publications

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