Intraplate Seasonal Seismicity in the Northern Rocky Mountains of Montana and Idaho

M. Perry, R. Bendick

    Research output: Contribution to journalLetterpeer-review

    Abstract

    Hydrologic processes have been shown to influence seismic productivity in many regions around the world, especially on active plate boundaries. To examine the influence of hydrologic loading cycles on seismicity in intraplate regions, we investigate temporal patterns of seismic productivity in the northern Rocky Mountains of Montana and Idaho. Seasonal variations in seismicity are present, with enhanced productivity in December and January, and reduced productivity in June and July. Using Snowpack Telemetry and GPS data, we find that seismicity is temporally correlated with the highest hydrologic loading rates rather than peak load, consistent with rate and state models of fault behavior for faults in critically stressed domains. However, we cannot distinguish between high hydrologic stress rates and pore pressure increases at seismogenic depths lagging ∼6 months after peak snowmelt.

    Original languageEnglish
    Article numbere2020GL090371
    JournalGeophysical Research Letters
    Volume48
    Issue number3
    DOIs
    StatePublished - Feb 16 2021

    Keywords

    • hydrospheric loading
    • intraplate seismicity
    • seasonal seismicity

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