Publication Date:
2017-04-04
Description:
Eruptions are fed by dikes; therefore, better knowledge of dike propagation is necessary to improve our
understanding of how magma is transferred and extruded at volcanoes. This study presents an overview of
dike patterns and the factors controlling dike propagation within volcanic edifices. Largely based on
published data, three main types of dikes (regional, circumferential and radial) are illustrated and discussed.
Dike pattern data from 25 volcanic edifices in different settings are compared to derive semi-quantitative
relationships between the topography (relief, shape, height, and presence of sector collapses) of the volcano,
tectonic setting (presence of a regional stress field), and mean composition (SiO2 content). The overview
demonstrates how dike propagation in a volcano is not a random process; rather, it depends from the
following factors (listed in order of importance): the presence of relief, the shape of the edifice and regional
tectonic control. We find that taller volcanoes develop longer radial dikes, whose (mainly lateral)
propagation is independent of the composition of magma or the aspect ratio of the edifice. Future research,
starting from these preliminary evaluations, should be devoted to identifying dike propagation paths and
likely locations of vent formation at specific volcanoes, to better aid hazards assessment.
Description:
Partly fundedwith DPC-INGVfunds (LAVAProject).
Description:
Published
Description:
67–77
Description:
1.5. TTC - Sorveglianza dell'attività eruttiva dei vulcani
Description:
3.2. Tettonica attiva
Description:
3.6. Fisica del vulcanismo
Description:
JCR Journal
Description:
reserved
Keywords:
dikes
;
volcanoes
;
topography
;
tectonic setting
;
eruptions
;
03. Hydrosphere::03.04. Chemical and biological::03.04.02. Carbon cycling
;
04. Solid Earth::04.01. Earth Interior::04.01.99. General or miscellaneous
;
04. Solid Earth::04.04. Geology::04.04.99. General or miscellaneous
;
04. Solid Earth::04.04. Geology::04.04.09. Structural geology
;
04. Solid Earth::04.07. Tectonophysics::04.07.99. General or miscellaneous
;
04. Solid Earth::04.07. Tectonophysics::04.07.05. Stress
;
04. Solid Earth::04.07. Tectonophysics::04.07.07. Tectonics
;
04. Solid Earth::04.08. Volcanology::04.08.99. General or miscellaneous
;
04. Solid Earth::04.08. Volcanology::04.08.03. Magmas
;
04. Solid Earth::04.08. Volcanology::04.08.06. Volcano monitoring
;
04. Solid Earth::04.08. Volcanology::04.08.08. Volcanic risk
;
05. General::05.02. Data dissemination::05.02.99. General or miscellaneous
;
05. General::05.02. Data dissemination::05.02.03. Volcanic eruptions
;
05. General::05.08. Risk::05.08.99. General or miscellaneous
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
