During 26 September to 4 October, seismicity remained above background levels at Shiveluch. Eleven earthquakes with magnitudes 2-2.7 occurred, as well as many smaller ones. During this interval, seismic data suggested there had been hot avalanches and 38 ash-and-gas explosions in which clouds reached 1-2.5 km above the lava dome. During 30 September to 2 October intermittent spasmodic volcanic tremor was recorded. Video images on 26 September at 1406 and 1759 showed short-lived explosions of ash and gas rising ~2.5 and 0.5 km above the dome, respectively. Thermal anomalies were visible on satellite imagery, but ash was not. Shiveluch remained at Concern Color Code Yellow.

Geological Summary. The high, isolated massif of Sheveluch volcano (also spelled Shiveluch) rises above the lowlands NNE of the Kliuchevskaya volcano group. The 1,300 km3 andesitic volcano is one of Kamchatka's largest and most active volcanic structures, with at least 60 large eruptions during the Holocene. The summit of roughly 65,000-year-old Stary Shiveluch is truncated by a broad 9-km-wide late-Pleistocene caldera breached to the south. Many lava domes occur on its outer flanks. The Molodoy Shiveluch lava dome complex was constructed during the Holocene within the large open caldera; Holocene lava dome extrusion also took place on the flanks of Stary Shiveluch. Widespread tephra layers from these eruptions have provided valuable time markers for dating volcanic events in Kamchatka. Frequent collapses of dome complexes, most recently in 1964, have produced debris avalanches whose deposits cover much of the floor of the breached caldera.

Source: Kamchatkan Volcanic Eruption Response Team (KVERT)