Publication Date:
2017-04-04
Description:
Volcanic eruptions are often accompanied by spatiotemporal migration of ground deformation, a
consequence of pressure changes within magma reservoirs and pathways. We modeled the propagation of
pressure variations through the east rift zone (ERZ) of K" ılauea Volcano, Hawai‘i, caused by magma
" o-Kupaianaha
withdrawal during the early eruptive episodes (1983–1985) of the ongoing Pu‘u ‘ O‘"
"
eruption. Eruptive activity at the Pu‘u ‘ O‘" o vent was typically accompanied by abrupt deflation that
lasted for several hours and was followed by a sudden onset of gradual inflation once the eruptive episode
had ended. Similar patterns of deflation and inflation were recorded at K" ılauea’s summit, approximately
15 km to the northwest, albeit with time delays of hours. These delay times can be reproduced by
modeling the spatiotemporal changes in magma pressure and flow rate within an elastic-walled dike that
traverses K" ılauea’s ERZ. Key parameters that affect the behavior of the magma-dike system are the dike
dimensions, the elasticity of the wall rock, the magma viscosity, and to a lesser degree the magnitude and
duration of the pressure variations themselves. Combinations of these parameters define a transport
efficiency and a pressure diffusivity, which vary somewhat from episode to episode, resulting in
variations in delay times. The observed variations in transport efficiency are most easily explained by
small, localized changes to the geometry of the magma pathway
Description:
Published
Description:
2232–2246
Description:
3V. Dinamiche e scenari eruttivi
Description:
JCR Journal
Description:
restricted
Keywords:
magma flow
;
dikes
;
Kilauea
;
elastic rock
;
magma-rock coupling
;
04. Solid Earth::04.08. Volcanology::04.08.99. General or miscellaneous
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
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