MT. KLYUCHEVSKOI VOLCANO 56o03'N, 160o39'E INFORMATION RELEASE No. 43 October 2, 1994, 11:15 KST (2315 UMT) Summary of activity for past 36 hours October 1 09:00-11:00. Ash and lava bursts produce a dark, ash-laden plume rising to a height of 50,000-60,000' ASL and moving in an ESE direction. 14:00 Dark ash plume to 50,000' ASL. 15:00 Lava and ash explosions still occur at the central crater with the ash column reaching to 40,000- 46,000' ASL. Plume is moving ESE at an altitude of 33,000-36,000' ASL. 15:00-17:00 KVERT member E.ZHDANOVA flew around the volcano by helicopter. Two lava flows were observed on the N and NW slopes of the volcano and lava was still fountaining to 3,000' above the crater rim. The eruption appeared to reach its maximum intensity between 6:00 and 16:30 KST. 19:00 Ash plume was now at a maximum altitude of 30,000- 35,000' ASL and drifting E for more than 60 miles. Volcanic tremor was continuous with a maximum amplitude of 8.4 mkm. October 2 09:20 A dark ash plume rising to an estimated 28,000- 29,000' ASL and drifting E. 11:00(2300UMT) Dark ash plume rising to 20,000-23,000' ASL and drifting NNE.