KVERT: ACTIVE VOLCANOES OF KAMCHATKA АND NORTHERN KURILES. Plosky Tolbachik volcano.

VOLCANOES OF NORTH KAMCHATKA

Fumarolic activity of Plosky Tolbachik
volcano in 1965

The crater of Plosky Tolbachik volcano
in beginning 70s years of 20 century

Plosky Tolbachik volcano on February 02, 1990

Plosky Tolbachik volcano in September 25, 2004

Plosky Tolbachik volcano in 2005

SRTM perspective view with Landsat overlay
Image Data: Landsat 7 ETM+ (bands 3, 2 ,1)
Original Data Resolution: SRTM 3 arcsecond
(90 meters), Landsat 30 meters.
Processing by Dmitry Melnikov.

Potential danger could be caused by terminal eruptions producing ash clouds to an altitude of 5 km ASL. Moreover, explosive eruptions sending ash clouds up to 10 – 15 km ASL are possible in regional zones of cinder cones in the south and north from the volcano. These eruptions could pose a thread to local and international aviation.

Ostry Tolbachik and Plosky Tolbachik volcanoes compose a single large volcanic massif. The 1800 m diameter caldera with a depth of 450 m that has been formed in 1975 is nested at the summit of Plosky Tolbachik.

1739?-1740 – strong explosive terminal eruption
1769 - weak explosive terminal eruption
1788-1790 - a weak explosive terminal eruption
1793 - weak explosive terminal eruption
1904 - weak explosive terminal eruption
1931 - weak explosive terminal eruption
1936-1937 - weak explosive terminal eruption
1939-1940 - moderate explosive terminal eruption
1941, May 7-14 - collateral explosive-effusive eruption
1954 - moderate explosive terminal eruption
1956-1957 - moderate explosive terminal eruption
1959-1960 - moderate explosive terminal eruption
1961-1962 - moderate explosive terminal eruption
1964 - moderate explosive terminal eruption
1967-1970 - moderate explosive terminal eruption

1975, June 28 - August 17 - weak explosive terminal eruption

a character of terminal eruptions: a recurrent appearance of the lava-lake in the summit crater; ash plumes to an altitude of 30 m (sometimes of 1.5 km) above the crater; gas-steam and gas-steam-ash activities of the crater

August 1975 - formation of the collapse-type caldera at the volcano summit
August 1975 - December 1977 - fumarolic activity at the foot of the northern and north-eastern walls of the caldera

July 06, 1975 - December 10, 1976 - the large Tolbachik Fissure Eruption (LTFE) took place within the Tolbachik regional zone of cinder cones in the south-western sector of the Klyuchevskaya group of volcanoes.

The volcano is located in the south-western sector of the Klyuchevskaya group of the volcanoes 63 km from Klyuchi and 343 km from Petropavlovsk-Kamchatsky.