Source Parameters and Tectonic Setting of the 2017 St. Elias Earthquake Sequence near the Southern Terminus of the Eastern Denali Fault, Northwestern Canada

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dc.contributor.advisorEaton, David W. S.
dc.contributor.advisorEnkelmann, Eva
dc.contributor.authorChoi, Minhee
dc.contributor.committeememberDettmer, Jan
dc.contributor.committeememberGilbert, Hersh J.
dc.date2019-11
dc.date.accessioned2019-09-20T16:26:35Z
dc.date.available2019-09-20T16:26:35Z
dc.date.issued2019-09-18
dc.description.abstractOn May 1, 2017 two earthquakes of magnitude 6.2 and 6.3, respectively, occurred in proximity to the eastern Denali fault (EDF). These double mainshock events were followed by more than 2,700 aftershocks. Moment-tensor inversion of the mainshock signals shows that the initial event produced reverse slip on a steeply dipping fault with a NW-SE strike direction, while the second produced left-lateral strike-slip on a near-vertical fault with an E-W strike direction. A double-difference relocation method, coupled with clustering analysis, was applied to the aftershock distribution, confirming that seismicity was localized along two previously unmapped fault structures. Stress inversion indicates that the maximum principal stress axis is oriented almost perpendicular to the EDF, suggesting that the fault system is not well oriented for strike-slip in the contemporary stress field. Coulomb stress analysis indicates that the second event was likely triggered by the first one (static stress triggering), with a delay of about two hours. A generalized model is developed to explain the observations, wherein gravitational potential from the >4,000 m high Mount Fairweather, as well as strain partitioning along the plate boundary, produce a stress regime that extends inboard towards the EDF.en_US
dc.identifier.citationChoi, M. (2019). Source Parameters and Tectonic Setting of the 2017 St. Elias Earthquake Sequence near the Southern Terminus of the Eastern Denali Fault, Northwestern Canada (Master's thesis, University of Calgary, Calgary, Canada). Retrieved from https://prism.ucalgary.ca.en_US
dc.identifier.doihttp://dx.doi.org/10.11575/PRISM/37087
dc.identifier.urihttp://hdl.handle.net/1880/111022
dc.language.isoengen_US
dc.publisher.facultyScienceen_US
dc.publisher.institutionUniversity of Calgaryen
dc.rightsUniversity of Calgary graduate students retain copyright ownership and moral rights for their thesis. You may use this material in any way that is permitted by the Copyright Act or through licensing that has been assigned to the document. For uses that are not allowable under copyright legislation or licensing, you are required to seek permission.en_US
dc.subjectEastern Denali Faulten_US
dc.subjectSt. Elias Mountainsen_US
dc.subjectFairweather Regionen_US
dc.subjectSt. Elias Earthquakesen_US
dc.subjectMoment Tensorsen_US
dc.subjectDouble-difference Relocationen_US
dc.subjectCoulomb Stressen_US
dc.subjectNorthwestern Canadaen_US
dc.subjectNorthern Cordilleraen_US
dc.subject.classificationGeologyen_US
dc.subject.classificationGeophysicsen_US
dc.titleSource Parameters and Tectonic Setting of the 2017 St. Elias Earthquake Sequence near the Southern Terminus of the Eastern Denali Fault, Northwestern Canadaen_US
dc.typemaster thesisen_US
thesis.degree.disciplineGeoscienceen_US
thesis.degree.grantorUniversity of Calgaryen_US
thesis.degree.nameMaster of Science (MSc)en_US
ucalgary.item.requestcopytrueen_US
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