Sheveluch volcano (Kamchatka, Russia): new lava dome Dolphin-2

lun., 17 mai 2021, 07:09
A new egg-like shape lava dome Dolphin-2 at Sheveluch volcano (image: KVERT)
A new egg-like shape lava dome Dolphin-2 at Sheveluch volcano (image: KVERT)
Webcam observations of the volcanological observatory KVERT from 15 May confirmed a new lava dome.
The lava dome had grown from the active lava dome and forming the "dome on top of a dome". The extruded lava dome stands out with a spectacularly and highly unusual, smooth, egg-like shape exactly as the previous lava dome "Dolphin".
This extremely smooth, curved outer surface indicates that the magma had been oozing out at a very steady flow rate, without exceeding the limits of plastic deformation of the erupted viscous lava, i.e. not causing any ruptures as is usually the case with lava domes, giving them often a rugged outer shape (as the older parts of Sheveluch's dome into which the new egg-like structure has now grown).
Volcanologists estimate that the lava of the new dome is of dacitic composition (a type of magma rich in silica and very viscous). They also dubbed it the "Dolphin-2".
Source: Kamchatka Volcanic Eruption Response Team volcano activity update 17 May 2021

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