Updating the crustal fault model for the 2023 National Seismic Hazard Model for Alaska
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Abstract
We present the crustal fault model for Alaska, based on geologic observations, as a primary input for the 2023 revision of the U.S. Geological Survey National Seismic Hazard Model. We update the 2013 Alaska Quaternary fault and fold database to produce a simplified model of 105 fault sections and four fault zone polygons with basic geologic parameters including slip sense and rate. Significant updates include the following: (1) a slip rate of ∼53 mm/year on the Queen Charlotte Fault indicating it accommodates all of the plate boundary motion; (2) quantified slip rates on megathrust splay faults in the southern Prince William Sound region and near Kodiak Island; (3) improved details of structures in the Chugach-St. Elias orogen; (4) revision of the Castle Mountain Fault from right-lateral slip to a predominantly reverse fault; (5) improved Interior Alaska tectonic models that clarify relationships between the Denali, Totschunda, and thrust faults on both sides of the Alaska Range; (6) identified large earthquake sources in the eastern Brooks Range; and (7) omission of the Chatham Strait section of the Denali Fault. The fault model underscores that the collision of the Yakutat microplate is the dominant driver of active crustal faulting in most of Alaska.
Suggested Citation
Haeussler, P., Bender, A., Powers, P.M., Koehler, R.D., Brothers, D., 2024, Updating the crustal fault model for the 2023 National Seismic Hazard Model for Alaska, chap. 4 of Tectonics and seismic structure of Alaska and northwestern Canada: EarthScope and beyond, p. 85-127, https://doi.org/10.1002/9781394195947.ch4.
Study Area
| Publication type | Book chapter |
|---|---|
| Publication Subtype | Book Chapter |
| Title | Updating the crustal fault model for the 2023 National Seismic Hazard Model for Alaska |
| Chapter | 4 |
| DOI | 10.1002/9781394195947.ch4 |
| Publication Date | December 13, 2024 |
| Year Published | 2024 |
| Language | English |
| Publisher | American Geophysical Union |
| Contributing office(s) | Alaska Science Center Geology Minerals |
| Description | 43 p. |
| Larger Work Type | Book |
| Larger Work Subtype | Monograph |
| Larger Work Title | Tectonics and seismic structure of Alaska and northwestern Canada: EarthScope and beyond |
| First page | 85 |
| Last page | 127 |
| Country | Canada, United States |
| State | Alaska, Yukon |