The autumn 1984 eruption

October 10, 1984 - 3 days before strong explosive eruption.
The glow of Volcano's active block

October 10, 1984. The autoexplosive avalanche.
 

October 13, 1984. The photo was taken from helicopter. Ash cloud continuously formed  on Volcano is moving in the direction of Apakhonchich Seismic Station.

 

October 14. The eruption begins to decline and surrounding volcanos are visible trough ash fall. We were in intensive ash fall zone during more than the day before	One of the last impulses of Volcano's explosive activity in the evening of October 14

 

October 22, 1984. Though impetuous activity of Volcano practically has stopped by the October 14 evening  the steady glow of volcano's active block was visible prior to the beginning of November.

  Evolution of Volcano's active block and dynamics of Bezymyannyi eruptive activity in the autumn 1984 eruption.
On sketch:
1-3 - the contours of active block accordingly on October 7, 9 and 10;
4 - the directions of deformations;
5 - the pathes of avalanches.
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.