Update on seismic swarm that began on July 8, 2025, at Mount Rainier, Washington—activity has returned to background levels. (Video shows Rainier’s summit as observed during a helicopter overflight by the CVO gas-monitoring team on August 4, 2025.) Information Statement: https://ow.ly/Cqfr50WLNxY SUMMARY Seismic activity at Mount Rainier has returned to normal background levels following an earthquake swarm that began on July 8, 2025. The Volcano Alert Level and Aviation Color Code for Mount Rai

Mount Rainier, an icon of the Pacific Northwest, is surrounded by a dramatic landscape of volcanic ridges and glacier-carved valleys. Look closer, and this familiar landscape contains the origin story of this area. It has been covered in swamps and ancient seas, flowing lava, explosive ash, and thick sheets of ice. Mountains rose and eroded away. This #EarthScienceWeek, explore the geologic history of Mount Rainier! NPS Video. Available with audio description at https://go.nps.gov/1pcf0e. ~kl |