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Investigating Dynamic Triggering in Cascadia Volcanic Systems Using Seismic Network Data

Dynamic stress from large, distant earthquakes can influence seismicity in tectonic regions, but its effect on volcanic systems in the Cascadia subduction zone remains less understood. This study investigates whether surface waves from large (M > 7.0) teleseismic earthquakes dynamically trigger microseismicity at major Cascadia volcanoes. The focus is on three primary volcanic centers: Mount Rainer, Mount St. Helens, and Mount Hood using catalog and waveform data from the Pacific Northwest Seismic Network (PNSN). Catalog analysis was conducted for events between January and August 2025 to identify changes in seismicity rates following global earthquakes. Station level analysis supported by basemaps of seismic network coverage highlights the spatial distribution of detections and network sensitivity. Python-based workflows, including short-term average/long-term average (STA/LTA) event detection and waveform visualization are applied to assess changes in seismicity rate following the amplitude and timing relative to Rayleigh wave arrivals. Preliminary results, over 7-month time window, suggest that distant large earthquakes do not trigger increases in microseismicity. These findings provide an initial framework for evaluating volcano specific stress sensitivity in Cascadia and lay the groundwork for extending analysis to longer time periods and additional volcanic systems. This work represents an early step toward improving eruption hazard assessments in subduction zone environments.

Session: Observation and Analysis of Topography and Deformation: Relating Earthquakes to Cascading Hazards [Poster]

Type: Poster

Room: Exhibit Hall A+B

Date: 4/17/2026

Presentation Time: 08:00 AM (local time)

Presenting Author: Itzel Noriega

Student Presenter: Yes

Invited Presentation: 

Poster Number: 141

Additional Authors