| 3 - 5 | Phreatomagmatic eruption |
 
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The first eruption on
17 November 1990,
was a phreatic eruption
at both of Jigokuato
and Kujukushima craters.
The eruption had once declined,
but the new Byobuiwa craters
appeared at
the south edge of
the Jigokuato crater
on 12 February of
the next year,
and a large amount of
ash was emitted.
In April, the eruption
became heavier and heavier.
Then it transferred
to the stage of
phreatomagmatic eruption.
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The position of craters at the beginning of the eruption |
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Cracks appeared just
before the lava extrusion.
In each crater were
made many holes, which were
later joined together
except a few.
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The first eruption |
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On 17 November 1990,
the eruption began
at Jigokuato (left)
and Kujukushima (right)
craters. A lot of debris
containing water
was emitted.
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A new eruption |
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On 12 December 1991,
a new eruption occurred
at the new Byobuiwa craters
with a lot of volcanic ash.
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Fugen Shrine thickly covered with volcanic ash |
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The new eruption
occurred just behind
Fugen Shrine,
which is now buried deep
under a lava dome.
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