BackgroundUksichan is a massive, gently dipping shield volcano that covers 1850 sq km. Its 300 cu km volume makes it the largest volcano of the Sredinny Range. Uksichan is truncated by a 12-km-wide summit caldera that is mostly filled by several dacitic lava domes. The largest of these rises 900 m above the caldera floor to form the 1692-m-high summit of the volcano. Initial lava flows traveled up to 15-20 km, but later flows are thicker and more viscous. In contrast to the western and NW flanks, which consist exclusively of lava flows, the eastern and SE flanks contain substantial amounts of pyroclastic material. Late-Quaternary cinder cones and Icelandic-type shield volcanoes are located on the flanks of the volcano. Early geologic studies in the Sredinny Range (Ogorodov et al., 1972) identified numerous Holocene eruptive centers based primarily on morphological criteria. However, later work has suggested that Sredinny Range volcanoes are less mantled by Holocene tephras than eastern Kamchatka volcanoes and therefore appear more youthful, so that Holocene eruptions are uncertain for many of these Sredinny Range eruptive vents.
Smithsonian / GVP volcano information
See also: Sentinel hub | Landsat 8