Persistent deep long-period seismicity near the Lassen Volcanic Center

Eric Kiser; Kevin M. Ward; Clint Koch; Emily Rodriguez; Haiyang Kehoe; Audrey M. Dunham; Peter Blake

doi:10.1029/2025gl118945

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Persistent deep long-period seismicity near the Lassen Volcanic Center

Eric Kiser·Kevin M. Ward·Clint Koch·Emily Rodriguez·Haiyang Kehoe·Audrey M. Dunham·Peter Blake

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Abstract

Deep long-period (DLP) earthquakes have been observed at many volcanic settings around the world and linked to the magmatic processes that drive volcanic unrest. At the Lassen Volcanic Center (LVC) of the Cascade arc, limited detection of DLP activity hinders classification of anomalous seismic behavior and its relationship to the LVC magmatic system. This study uses a template matching approach with seismic data from temporary nodal and permanent stations to detect and locate DLP earthquakes near the LVC between 2017 and 2024. Within the DLP catalog of 611 events, a transition occurs from scattered (2017–2020) to oscillatory (2021–2024) occurrence rates. During the oscillatory period, regional earthquakes with large amplitude velocity waveforms observed near the LVC are associated with abrupt changes in DLP occurrence rates. Continued monitoring of DLP activity has the potential to better define the processes that drive volcanic unrest at the LVC in the future.

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Geophysical Research Letters Article

Source-reported bounding extent: 40.3° to 40.6° latitude; -121.7° to -121.35° longitude. This indicates report coverage, not an exact sampling location. View area on OpenStreetMap.

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Eric Kiser, Kevin M. Ward, Clint Koch, Emily Rodriguez, Haiyang Kehoe, Audrey M. Dunham, Peter Blake. 2025-12-08. Persistent deep long-period seismicity near the Lassen Volcanic Center. https://doi.org/10.1029/2025gl118945

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California place United STates place Article subject Geophysical Research Letters subject Lassen Volcanic Center place

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