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A Detailed Earthquake Catalog for Interior Alaska Fault Zones

We use network-matched filtering (NMF) and relative earthquake relocation techniques to derive a detailed catalog of earthquake locations for the Minto Flats fault zone (MFFZ) in interior Alaska between September 2014 and December 2019. The MFFZ is a left-lateral strike-slip fault system situated between the right-lateral Denali and Kaltag faults. It produced a magnitude-6 earthquake in 1995 and has potential for a magnitude-7 earthquake. We systematically test parameters for the NMF and earthquake relocation routines and perform a qualitative check on the final catalog in order to reduce false detections that would skew relocations. Our results provide the most complete catalog for the MFFZ and include deeper events, clusters of shallow seismicity and a complex, and segmented fault structure not observed in the original regional catalog. We are also able to determine the fault orientation of the northwest cluster of seismicity containing the 2014 Mw 5.0 event as well as identify a previously unstudied third strand segment in the southwest region of the fault zone.

Session: Cryptic Faults: Advances in Characterizing Low Strain Rate and Environmentally Obscured Faults [Poster Session]

Type: Poster

Room: Exhibit Hall

Date: 5/1/2024

Presentation Time: 08:00 AM (local time)

Presenting Author: Nealey Sims

Student Presenter: Yes

Additional Authors