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UID:seminar-15386@epss.ucla.edu
DTSTAMP:20260522T193455Z
DTSTART:20260527T153000Z
DTEND:20260527T163000Z
SUMMARY:Geophysics &#038\; Geology (245/287): Saeed Mohanna &#8211\; Co- and Post-seismic Effects of the 2022 Mw 6.4 Ferndale and 2024 Mw 7.0 Offshore Cape Mendocino sequences
DESCRIPTION:Speaker: Saeed Mohanna
Affiliation: EPSS\, UCLA
Date: Wednesday\, May 27\, 2026
Time: 12:00 PM

Abstract
The Mendocino Triple Junction is in a tectonically complex region where a multitude of physical mechanisms contribute to crustal deformation. To discern these physical drivers\, our group (1) enhanced the Northern California Seismic Network (NCSN) earthquake catalog spanning the 2022 Ferndale and 2024 Offshore Cape Mendocino sequences using machine learning and template matching approaches\, (2) extended a repeating earthquake catalog to study the contribution of aseismic slip to both earthquake sequences (3) analyzed changes in groundwater levels during the both sequences. In this talk\, I will present our enhanced catalogs\, which reveal ~5-10 times more events than the NCSN catalog\, with a clear concentration of seismicity at the edges of the 2024 sequence’s coseismic slip patch. Additionally\, I will highlight our study&#39\;s evidence for accelerating afterslip in the weeks following the 2024 sequence\, and an elastic strain mechanism to explain the observed groundwater level changes.
URL:https://epss.ucla.edu/geophysics-geology-245-287-saeed-mohanna-co-and-post-seismic-effects-of-the-2022-mw-6-4-ferndale-and-2024-mw-7-0-offshore-cape-mendocino-sequences-2/
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