Top of Part 3
Previous p.
Next page
As the supply of
magma decreased,
the growth of lava
dome shifted to
the stage of formation of
clastic lava mound
right on the vent site
of the Jigokuato crater.
| 3 - 13 |
Growth and collapse of lava dome (Period 3) |
|
Top of Part 3
Previous p.
Next page
|
As the supply of
magma decreased,
the growth of lava
dome shifted to
the stage of formation of
clastic lava mound
right on the vent site
of the Jigokuato crater.
|
|
South view of clastic lava mound
This is one of typical example of lava lobe when magma supply decreases. (5 Jan. 1994) |
North-east view of clastic lava mound
When magma supply increased temporarily, a huge lava block with slight viscosity was erupted and a spine was formed. (26 Apr. 1994) |
|
|
|
|
North-east view of clastic lava mound
You can see a stick-like spine made of pressed lava. (22 Jul. 1994) |
North-east view of clastic lava mound
See the plate-like lava spine extended east and west. It was extended in the peripheral part and concave saucer-like. (4 May 1995) |
|
|
|
|
Southern view of the plate-like lava spine
on the summit of the lava dome
About 25m in height and 80m in width. Cooling and shrinking of the underground domain, and sinking and decaying of the dome are in progress. (10 May 1996) |
|
|
|
|
Top page of Part 3
Previous page
Next page
|