Seismic analysis of the 2020 Magna, Utah, earthquake sequence: Evidence for a listric Wasatch fault
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Abstract
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 (<30–35°) structures, indicating the existence of a complicated fault system. Our observations constrain the deep structure of the Wasatch fault system and suggest that ground shaking in the Salt Lake City region in future Wasatch fault earthquakes may be higher than previously estimated.
Study Area
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Seismic analysis of the 2020 Magna, Utah, earthquake sequence: Evidence for a listric Wasatch fault |
| Series title | Geophysical Research Letters |
| DOI | 10.1029/2020GL089798 |
| Volume | 47 |
| Issue | 18 |
| Year Published | 2020 |
| Language | English |
| Publisher | American Geophysical Union |
| Contributing office(s) | Geologic Hazards Science Center |
| Description | e2020GL089798, 10 p. |
| Country | United States |
| State | Utah |
| City | Salt Lake City |
| Google Analytic Metrics | Metrics page |