Integrating puffing and explosions in a general scheme for Strombolian-style activity

Journal of Geophysical Research B: Solid Earth
By: , and 

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Abstract

Strombolian eruptions are among the most common subaerial styles of explosive volcanism worldwide. Distinctive features of each volcano lead to a correspondingly wide range of variations of magnitude and erupted products, but most papers focus on a single type of event at a single volcano. Here, in order to emphasize the common features underlying this diversity of styles, we scrutinize a database from 35 different erupting vents, including 21 thermal infrared videos from Stromboli (Italy), Etna (Italy), Yasur (Vanuatu), and Batu Tara (Indonesia), from puffing, through rapid explosions to normal explosions, with variable ejection parameters and relative abundance of gas, ash, and bombs. Using field observations and high-speed thermal infrared videos processed by a new algorithm, we identify the distinguishing characteristics of each type of activity and how they may relate and interact. In particular, we record that ash-poor normal explosions may be preceded and followed by the onset or the increase of the puffing activity, while ash-rich explosions are emergent, i.e., with inflation of the free surface followed directly by emission of increasingly large gas pockets. Overall, we see that all Strombolian activities form a continuum arising from a common mechanism and are modulated by the combination of two well-established controls: (1) the length of the bursting gas pocket with respect to the vent diameter and (2) the presence and thickness of a high-viscosity layer in the uppermost part of the volcanic conduit.

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Integrating puffing and explosions in a general scheme for Strombolian-style activity
Series title Journal of Geophysical Research B: Solid Earth
DOI 10.1002/2016JB013707
Volume 122
Issue 3
Year Published 2017
Language English
Publisher AGU Publications
Contributing office(s) Volcano Science Center
Description 16 p.
First page 1860
Last page 1875