Chachadake [Tiatia] (Japan - administered by Russia)

Status Unknown Eruption 1981 1822m
Stratovolcano (Subduction zone / Intermediate crust (15-25 km))

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.

The SE flanks of 1819-m-high Tiatia volcano, one of the most impressive of the Kuril Islands, rise above the Pacific Ocean at the NE tip of Kunashir Island. A beautifully symmetrical cone (center) rises above the low snow-covered rim of an erosionally furrowed, 2.1 x 2.4 km caldera. A major explosive eruption in 1973 was the first since Tiatia's initial historical eruption in 1812.

Copyrighted photo by Yoshihiro Ishizuka, 1992 (Japanese Quaternary Volcanoes database, RIODB, http://riodb02.ibase.aist.go.jp/strata/VOL_JP/EN/index.htm and Geol Surv Japan, AIST, http://www.gsj.jp/).

Last updated 2019-08-04 00:28:03