Jebel Zubair volcano (Red Sea, Jemen): satellite image shows growth of new island
mercredi janv. 11, 2012 12:54 | AUTEUR : T
This new satellite image, acquired January 7, 2012, suggests that the eruption has risen nearly completely above water. A plume of steam, other volcanic gases, and ash spews from a distinct cone. The land surrounding the vent has grown, and is now about 530 by 710 meters (1,700 by 2,300 feet) across. Once above water, past eruptions in the Zubair Islands were primarily effusive, with relatively runny lava forming thin lava flows.
In contrast to the fragmented rock that forms when lava interacts directly with water, lava that solidifies on land is tough, so this new island is likely to be permanent.
Compare this to the satellite picture of the same area from 23 December to see the growth of the island (below).
Zubair volcano (Jemen, Red Sea): New dramatic video shows volcanic eruption
mercredi janv. 04, 2012 20:43 | AUTEUR : TP
New island born in the Red Sea at the Zubair archipelago (Jemen)
mercredi déc. 28, 2011 21:19 | AUTEUR : T
A large steam plume, generated by evaporating sea water at the entry of lava flows into the sea is seen on the satellite image, drifting north.
The island has apparently passed through an explosive Surtseyan phase very quickly, probably because the erupting basalt lava was poor in gas and because the output rate was high, so that the vent could be sealed from water access in short time.
mercredi, déc. 21, 2011
(update 21 Dec:) ... [details]
Cliquez ici pour recommander cette page à un ami