Overview

• KVERT reported an explosive event at Kronotsky that lofted ash to about 9.2 kilometers with a plume stretching roughly 85 kilometers, prompting a red aviation code signifying high risk to local and international flights.
• Shiveluch produced ash plumes reaching 4.5 kilometers on October 3 and about 3 kilometers early October 4, with an orange aviation code and a caution that minor ash fall could occur in Ust-Kamchatsky district if winds shift, though none was observed.
• Resuspended ash plumes were observed at Klyuchevskoy and Krasheninnikov up to roughly 3 kilometers high, extending tens of kilometers, with color-coded warnings in effect for aviation safety.
• Emergency services recorded 32 aftershocks over the latest 24 hours with magnitudes up to 6.4, three felt by residents, following 29 events the day before that reached up to magnitude 5.5.
• The regional geophysical service separately logged a magnitude 5.7 quake offshore at about 55 kilometers depth, as authorities continued urging residents and visitors to avoid volcanic areas.