High-Resolution Seismic Catalog for Minto Flats Fault Zone, Central Alaska, Based on Waveform Cross-Correlation of Events Between 2014–2019
Accurate catalogs of earthquake locations, magnitudes, and origin times provide a foundation for the study of fault dynamics, brittle-ductile transition zones, earthquake migration, and structural seismology. Environmental noise such as from bodies of water and urban development can negatively impact the detection of low-magnitude earthquakes, and therefore it is beneficial to incorporate other methods such as waveform correlation to aid in the detection process. We use network-matched filtering and relative relocation techniques to compile an enhanced earthquake catalog of the Minto Flats fault zone (MFFZ) in interior Alaska. MFFZ is a left-lateral strike-slip fault system situated between the Denali and Kaltag faults and is associated with Nenana basin. It produced a magnitude-6 earthquake in 1995 and has potential for a magnitude-7 earthquake. Our enhanced catalog for MFFZ is, as expected, dominated by small-magnitude (M ~ 0) events below the traditional detection limits. The results of this study provide the most complete catalog available for the MFFZ from September 2014 to December 2019 and include deeper events, clusters of seismicity and a complex, and segmented fault structure not present in the regional catalog. We are also able to more strongly identify a third fault strand within the zone that was previously unstudied.
Session: Crustal Deformation and Seismic Hazard in Western Canada, Cascadia and Alaska [Poster]
Type: Poster
Room: Ballroom
Date: 4/20/2023
Presentation Time: 08:00 AM (local time)
Presenting Author: Nealey Sims
Student Presenter: Yes
Additional Authors
Nealey Sims Presenting Author Corresponding Author nesims@alaska.edu University of Alaska Fairbanks |
Carl Tape ctape@alaska.edu University of Alaska Fairbanks |
Natalia Ruppert naruppert@alaska.edu University of Alaska Fairbanks |
Michael West mewest@alaska.edu University of Alaska Fairbanks |
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High-Resolution Seismic Catalog for Minto Flats Fault Zone, Central Alaska, Based on Waveform Cross-Correlation of Events Between 2014–2019
Category
Crustal Deformation and Seismic Hazard in Western Canada, Cascadia and Alaska
Description