Seismic Analysis of the 2020 Magna, Utah, Earthquake Sequence: Evidence for a Listric Wasatch Fault

The 18 March 2020 Mw 5.7 Magna earthquake near Salt Lake City, Utah, offers a rare glimpse into the subsurface geometry of the Wasatch fault system—one of the world's longest active normal faults and a major source of seismic hazard in northern Utah. We analyze the Magna earthquake sequence and...

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Bibliographic Details
Published in:Geophysical research letters 2020-09, Vol.47 (18), p.n/a
Main Authors: Pang, Guanning, Koper, Keith D., Mesimeri, Maria, Pankow, Kristine L., Baker, Ben, Farrell, Jamie, Holt, James, Hale, J. Mark, Roberson, Paul, Burlacu, Relu, Pechmann, James C., Whidden, Katherine, Holt, Monique M., Allam, Amir, DuRoss, Christopher
Format: Article
Language:English
Subjects:
Aftershocks
Depth
Dipping
Earthquakes
Fault zones
Geological faults
Geological hazards
Lakes
Metropolitan areas
Planar structures
Seismic activity
Seismic analysis
Seismic data
Seismic hazard
Seismological data
Sequencing
Shaking
Shape
Suburban areas
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Summary:The 18 March 2020 Mw 5.7 Magna earthquake near Salt Lake City, Utah, offers a rare glimpse into the subsurface geometry of the Wasatch fault system—one of the world's longest active normal faults and a major source of seismic hazard in northern Utah. We analyze the Magna earthquake sequence and resolve oblique‐normal slip on a shallow (30–35°) west‐dipping fault at ~9‐ to 12‐km depth. Combined with near‐surface geological observations of steep dip (~70°), our results support a curved, or listric, fault shape. High‐precision aftershock locations show the activation of multiple, low‐angle (
ISSN:0094-8276
1944-8007
DOI:10.1029/2020GL089798