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| Titel |
A set of alternative explanations to account for the deformation field at Montserrat, West Indies |
| VerfasserIn |
Amy Collinson, Jurgen Neuberg, Karen Pascal |
| Konferenz |
EGU General Assembly 2015
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 17 (2015) |
| Datensatznummer |
250102792
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| Publikation (Nr.) |
 EGU/EGU2015-4693.pdf |
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| Zusammenfassung |
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For almost 20 years, Soufrière Hills Volcano, Monsterrat, has been in a state of volcanic
unrest. Intermittent periods of dome building have been punctuated by explosive eruptions
and dome collapse events, endangering the lives of the inhabitants of the island. To
date, there have been numerous phases to the activity, with the current activity
designated Pause 5. There has not been any active magma extrusion since February
2010, and the last significant explosive (ash-venting) event occurred in March 2012.
However, the volcano continues to emit an average of 374t/d SO2 and shows signs of
deformation.
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Current observations indicate a line lengthening between several pairs of GPS
stations across the island, suggesting an overall inflation of Montserrat. Through
the use of three-dimensional numerical modelling using a finite element method,
we explore the potential sources of this deformation, ranging from an inflating
magma chamber or dyke - suggesting ongoing volcanic activity, to the existence of
an active left-lateral strike-slip fault - which may indicate cessation of volcanic
activity.
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We show the effect of different dyke sources (shapes, characters and depths)
on the surface displacement. Furthermore, through the inclusion of topographic
data, we investigate how the topography may affect the displacement pattern at the
surface.
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Alternatively, we determine how much fault slip would be required in order to derive the
deformation observed. |
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