Depth of earthquakes during the July 8-14, 2025, seismic swarm at Mount Rainier, WA.
Weston Thelen
I love earthquakes. I love volcanoes. And I know for a fact that volcano seismology is the best seismology.
As a research geophysicist at the Cascades Volcano Observatory, I undertake and facilitate research on Cascade Range Volcanoes; monitor seismicity on Cascade Range Volcanoes to assess volcanic hazard; and assist in planning, prioritization and execution of maintenance and growth of volcano monitoring networks in Oregon and Washington.
My education is in both geology and geophysics with a focus more recently on volcanoes. I have experience on both stratovolcanoes and basaltic volcanoes in Russia, Alaska, Washington, Oregon and Hawaii. I've worked in eruptive scenarios at Mount St. Helens in 2004-2008, Redoubt in 2008 and Kilauea from 2011 till 2020. In addition, I've held positions at the Nevada Seismological Network, the Pacific Northwest Seismic Network and the Hawaiian Volcano Observatory, which have all had components of network seismology to them.
Science and Products
Depths of located earthquakes during July 8-14, 2025, seismic swarm at Mount Rainier, WA
Depth of earthquakes during the July 8-14, 2025, seismic swarm at Mount Rainier, WA.
Seismicity beneath Mount Rainier, highlighting July 8-14, 2025, earthquake swarm
Seismicity beneath Mount Rainier, Washington, showing earthquakes during 2020-2025 in blue, and those that occurred as part of an earthquake swarm on July 8-14, 2025, in orange.
Seismicity beneath Mount Rainier, Washington, showing earthquakes during 2020-2025 in blue, and those that occurred as part of an earthquake swarm on July 8-14, 2025, in orange.
Earthquake magnitudes and numbers over time during July 8-14, 2025, Mount Rainier earthquake swarm
linkPlots of earthquake magnitudes (top) and numbers (bottom) over the course of the July 8-14 seismic swarm at Mount Rainier, Washington. The swarm was greatest in terms of numbers of events on the morning of July 8. After that time, earthquake rates slowly decreased over the course of the following days.
Earthquake magnitudes and numbers over time during July 8-14, 2025, Mount Rainier earthquake swarm
linkPlots of earthquake magnitudes (top) and numbers (bottom) over the course of the July 8-14 seismic swarm at Mount Rainier, Washington. The swarm was greatest in terms of numbers of events on the morning of July 8. After that time, earthquake rates slowly decreased over the course of the following days.
Deformation and seismicity near South Sister during 2001-2022
Comparison of vertical GPS motion measured at station HUSB (top) with earthquake depth (bottom). Red line is a 60-day average of the cleaned GPS time series plotted in gray. Earthquakes are plotted with respect to their magnitudes. The swarm in 2004 represents the vast majority of earthquake in the vicinity of the deforming region.
Comparison of vertical GPS motion measured at station HUSB (top) with earthquake depth (bottom). Red line is a 60-day average of the cleaned GPS time series plotted in gray. Earthquakes are plotted with respect to their magnitudes. The swarm in 2004 represents the vast majority of earthquake in the vicinity of the deforming region.
Science and Products
Depths of located earthquakes during July 8-14, 2025, seismic swarm at Mount Rainier, WA
Depth of earthquakes during the July 8-14, 2025, seismic swarm at Mount Rainier, WA.
Depth of earthquakes during the July 8-14, 2025, seismic swarm at Mount Rainier, WA.
Seismicity beneath Mount Rainier, highlighting July 8-14, 2025, earthquake swarm
Seismicity beneath Mount Rainier, Washington, showing earthquakes during 2020-2025 in blue, and those that occurred as part of an earthquake swarm on July 8-14, 2025, in orange.
Seismicity beneath Mount Rainier, Washington, showing earthquakes during 2020-2025 in blue, and those that occurred as part of an earthquake swarm on July 8-14, 2025, in orange.
Earthquake magnitudes and numbers over time during July 8-14, 2025, Mount Rainier earthquake swarm
linkPlots of earthquake magnitudes (top) and numbers (bottom) over the course of the July 8-14 seismic swarm at Mount Rainier, Washington. The swarm was greatest in terms of numbers of events on the morning of July 8. After that time, earthquake rates slowly decreased over the course of the following days.
Earthquake magnitudes and numbers over time during July 8-14, 2025, Mount Rainier earthquake swarm
linkPlots of earthquake magnitudes (top) and numbers (bottom) over the course of the July 8-14 seismic swarm at Mount Rainier, Washington. The swarm was greatest in terms of numbers of events on the morning of July 8. After that time, earthquake rates slowly decreased over the course of the following days.
Deformation and seismicity near South Sister during 2001-2022
Comparison of vertical GPS motion measured at station HUSB (top) with earthquake depth (bottom). Red line is a 60-day average of the cleaned GPS time series plotted in gray. Earthquakes are plotted with respect to their magnitudes. The swarm in 2004 represents the vast majority of earthquake in the vicinity of the deforming region.
Comparison of vertical GPS motion measured at station HUSB (top) with earthquake depth (bottom). Red line is a 60-day average of the cleaned GPS time series plotted in gray. Earthquakes are plotted with respect to their magnitudes. The swarm in 2004 represents the vast majority of earthquake in the vicinity of the deforming region.