The 1970 eruption on Deception Island (Antarctica): eruptive dynamics and implications for volcanic hazards
Dario Pedrazzi
Gerardo Aguirre-Díaz
Stefania Bartolini
Joan Martí
Adelina Geyer
10.6084/m9.figshare.3453761.v1
https://geolsoc.figshare.com/articles/dataset/The_1970_eruption_on_Deception_Island_Antarctica_eruptive_dynamics_and_implications_for_volcanic_hazards/3453761
<p>In the southern winter of 1970, a phreatomagmatic eruption occurred in the northern part of Deception Island (South Shetland
Archipelago, Antarctic Peninsula). The eruption, with no eye-witnesses to the event, occurred in the same general area as
the 1967 eruption, but with new, more widely distributed vents. Two contrasting groups of craters were formed in the 1970
eruption, showing that different active fissures and eruptive dynamics were operating. One group consists of ‘maar-like’ craters,
whereas the other comprises conical edifices. The 1970 eruption can be classified as volcanic explosivity index (VEI) 3, with
mainly phreatomagmatic phases that generated a bulk volume of about 0.1 km<sup>3</sup> of pyroclastic material and an eruptive column at least 10 km high, from which fallout deposits are recognized more than
100 km to the NE. The 1970 eruption was similar to that of 1967 and together these two eruptive events show how eruption dynamics
can be controlled by the uppermost part of the volcano substrate and the width and orientation of the eruptive fissure. These
influence magma–water interaction and hence may imply different eruptive phases and associated volcanic hazards.
</p>
2016-06-21 11:40:01
dynamic
Deception Island
0.1 km 3
NE
South Shetland Archipelago
VEI
eruptive events show
1970 eruption
Geology