The 1985 eruption

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Increasing activity of Volcano:
the collapse on June 12 (A) and autoexplosive avalanches on June 24 (B) and 25 (C), 1985

The pyroclastic flow on the evening of June 30, 1985. The photography was made from small hill (the north spurs of Ziminy Volcanos - see the point 6 on scheme of eruption or the point 5 on scheme of Apakhonchich disposition). The twilights hide relief and perspective. Shortest distance up to flow is 2 kms, and it front is on distance about 5 km..
Above - Jule 1, 1985. Pyroclastic flows
blocked the channel of small river
(the point 4 on the scheme). Water from mountains
became the cause for repeated explosions on
hot deposits of pyroclastic flows.
At the left - the day after: water wins a victory.
Photos was made from the point 6 on the scheme

The heels of two expeditionary lodges situated not far from dome (the point 2 on the scheme) and destroyed by eruption.
One of the lodges sustained previous eruptions during more than twenty years.

The scheme of eruption at June 30 - Jule 1, 1985
1 - the initial direction of superpower outflow of red hot pyroclasts;
2 - the paths of lightest pyroclasts' movement;
3 - the paths of pyroclastic flows' movement;
4 - the path of heavy debris-pyroclastic flow movement;
5 - the direction of wind drift of eruptive cloud;
6 - the deposition area of pyroclastic flows' material;
7 - the boundary of accretionary lapilli fall' area.

The gigantic crater in the dome structure was formed during the June 29 - July 2 eruption (at the upper left).
However the eruption didn't ended on this - the pressing of red hot juvenile material was continued in crater's upper part.
In night the red hot material's collapses were accompanied by glow (at the upper right and at the bottom).
The continued pressing of juvenile lava material resulted in the forming of two lava flows (in August and in December).

Evolution of active block in the 1985 eruption
The arrows on diagram are showing states:
1 - the rest,
2 - the steady stationary development,
3 - the avalanche-like (the more the faster) increase of activity,
4 - the avalanche-like (the less the slower) decrease of activity.

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