MT. KLYUCHEVSKOI VOLCANO 56o03'N, 160o39'E INFORMATION RELEASE No. 42 October 1, 1994, 11:00 KST (2200 UMT) On the afternoon of September 30, eruptive activity increased with ash bursts observed rising to 10,000' above the crater and an ash column rising to an estimated elevation of 32,000-35,000' ASL. This ash plume extended to the southeast for more than 60 miles. [Note: AVO passed on the information on ash column height and plume length to the FAA and National Weather Service at 1:50 AM this morning, September 30 Anchorage time after receiving a phone call from KVERT]. Lava flows were observed on the northwest and southwest slopes of the volcano extending down to about 10,000' ASL. Mudflows were noted on the north slope of the volcano. Continuous volcanic tremor was being recorded with a maximum amplitude of 8.4 microns registered at a distance of 11 km from the volcano. Today, October 1, the eruption entered a paroxysmal stage at 0600 with burst of lava rising to 15,000' above the crater rim. The ash column elevation was estimated at 50,000-65,000' ASL and extended to the southeast for more than 60 miles. Phreatic explosions were occurring along the margin of the flank lava flows with steam clouds reaching to thousands of feet. Avalanches of incandescent blocks were observed coming from the crater down the north slope of the volcano.