John Seach, Volcano Live

 How Long do Volcanic Eruptions Last ?

It is much more difficult to predict the end of an eruption than to predict its beginning.
The table below gives the length of time that volcanoes erupt.
Explosive eruptions end when sufficient decompression is attained to cause magma chamber
collapse and restoration of the initial pressure conditions.

Length of Eruption
% of Eruptions
Cumulative Total %
< 1 day
10
10
1 day to 1 week 
14
24
1 week to 1 month
   20
44
1 to 6 months
  28
72
6 months to 1 year 
   12 
84
1 to 2 years 
   7
91
2 to 5 years 
  5
96
5 to 10 years 
  2
98
10 to 20 years
   1
99
> 20 years
  1
100

 

How Long do Volcanic Eruptions Last?
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