USGS Volcano Notice - DOI-USGS-CVO-2025-07-11T16:19:26+00:00

CASCADES VOLCANO OBSERVATORY WEEKLY UPDATE
U.S. Geological Survey
Friday, July 11, 2025, 1:07 PM PDT (Friday, July 11, 2025, 20:07 UTC)

CASCADE RANGE (VNUM #)
Current Volcano Alert Level: NORMAL
Current Aviation Color Code: GREEN

Activity Update: All volcanoes in the Cascade Range of Oregon and Washington are at normal background activity levels. These include Mount Baker, Glacier Peak, Mount Rainier, Mount St. Helens, and Mount Adams in Washington State and Mount Hood, Mount Jefferson, Three Sisters, Newberry, and Crater Lake in Oregon.

Past Week Observations: During the past week, small earthquakes were detected at Mount Rainier, Mount St. Helens, Mount Adams, and Mount Hood. All monitoring data are consistent with background activity levels in the Cascade Range.

Mount Rainier has been experiencing a seismic swarm that began on 1:29 AM PDT (8:29 UTC) on July 8th. Since the start of the swarm, earthquake event rates have been gradually decreasing from a peak of 30 events per hour on the morning of July 8th to only a few events per hour as of today at 1:00 PM PDT (20:00 UTC). The largest magnitude event was a 2.4 that occurred on July 11th at 12:23 PM PDT (19:23 UTC). Since the start of the swarm, 423 events that are mainly spread between 1.5-4 miles (2-6 km) beneath the summit have been located by the Cascades Volcano Observatory and the Pacific Northwest Seismic Network.

For more information on this swarm, see: https://www.usgs.gov/observatories/cvo/news/monitoring-stations-detect-small-magnitude-earthquakes-mount-rainier

The U.S. Geological Survey Cascades Volcano Observatory and the University of Washington Pacific Northwest Seismic Network continue to monitor Washington and Oregon volcanoes closely and will issue additional notifications as warranted.

Website Resources

For images, graphics, and general information on Cascade Range volcanoes: https://www.usgs.gov/observatories/cvo
For seismic information on Oregon and Washington volcanoes: http://www.pnsn.org/volcanoes
For information on USGS volcano alert levels and notifications: https://www.usgs.gov/programs/VHP/volcano-notifications-deliver-situational-information

CONTACT INFORMATION:

Michael Poland, Acting Scientist-in-Charge, Cascades Volcano Observatory, mpoland@usgs.gov

General inquiries: askCVO@usgs.gov

Media inquiries: volcanomedia@usgs.gov