Report on Chachadake [Tiatia] (Japan - administered by Russia) — 29 August-4 September 2012
Smithsonian / US Geological Survey Weekly Volcanic Activity Report,
29 August-4 September 2012
Managing Editor: Sally Kuhn Sennert
Please cite this report as:
Global Volcanism Program, 2012. Report on Chachadake [Tiatia] (Japan - administered by Russia). In: Sennert, S K (ed.), Weekly Volcanic Activity Report, 29 August-4 September 2012. 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 weak thermal anomaly over Tiatia was detected in satellite images on 1 September. The Aviation Color Code remained at Yellow.
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.