Report on Chachadake [Tiatia] (Japan - administered by Russia) — 2 June-8 June 2010
Smithsonian / US Geological Survey Weekly Volcanic Activity Report,
2 June-8 June 2010
Managing Editor: Sally Kuhn Sennert
Please cite this report as:
Global Volcanism Program, 2010. Report on Chachadake [Tiatia] (Japan - administered by Russia). In: Sennert, S K (ed.), Weekly Volcanic Activity Report, 2 June-8 June 2010. Smithsonian Institution and US Geological Survey.
Japan - administered by Russia
44.353°N, 146.252°E; summit elev. 1822 m
All times are local (unless otherwise noted)
SVERT reported that a thermal anomaly from Tiatia was detected by satellite on 31 May. Tiatia does not have a seismic network; satellite image observations are the primary tool for monitoring many of the Kurile Islands volcanoes.
Geological Summary. Chachadake, also known as Tiatia, consists of a beautifully symmetrical cone that rises above the broad rim of an erosionally furrowed, 2.1 x 2.4 km wide caldera. The edifice occupies the NE tip of Kunashir Island and morphologically resembles Mount Vesuvius. The pristine-looking conical central cone, mostly formed by basaltic to basaltic-andesite strombolian eruptions, rises 400 m above the floor of the caldera and contains a 400 x 250 m wide crater with two explosion vents separated by a linear septum. Fresh lava flows cover much of the SW caldera floor and have overflowed the rim, extending to the foot of the older somma, which formed during the late Pleistocene or early Holocene. A lava flow from a flank cone on the northern caldera rim reached the Sea of Okhotsk. A major explosive eruption in 1973 followed an initial historical eruption in 1812.