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

Alaska Volcano Observatory on Instagram: "AVO/USGS Volcanic Activity Notice Volcano: #Shishaldin (VNUM 311360) Current Volcano Alert Level: ADVISORY Previous Volcano Alert Level: NORMAL Current Aviation Color Code: YELLOW Previous Aviation Color Code: GREEN Issued: Monday, August 25, 2025, 11:48 AM AKDT Over the past month, signs of volcanic unrest at Shishaldin Volcano have been gradually increasing. Sulfur dioxide emissions have increased, a more vigorous vapor plume from the summit crater has