The relationship between eruptive activity, flank collapse, and sea level at volcanic islands: A long-term (>1 Ma) record offshore Montserrat, Lesser Antilles - INSU - Institut national des sciences de l'Univers Access content directly
Journal Articles Geochemistry, Geophysics, Geosystems Year : 2016

The relationship between eruptive activity, flank collapse, and sea level at volcanic islands: A long-term (>1 Ma) record offshore Montserrat, Lesser Antilles

Maya Coussens
  • Function : Author
Deborah Wall-Palmer
  • Function : Author
Peter. J. Talling
  • Function : Author
Sebastian. F. L. Watt
  • Function : Author
Michael Cassidy
  • Function : Author
Martin Jutzeler
  • Function : Author
Michael A. Clare
  • Function : Author
James. E. Hunt
  • Function : Author
Michael Manga
Thomas. M. Gernon
  • Function : Author
Martin. R. Palmer
  • Function : Author
Stuart. J. Hatter
  • Function : Author
Daisuke Endo
  • Function : Author
Akihiko Fujinawa
  • Function : Author
Robert Hatfield
  • Function : Author
Matthew. J. Hornbach
  • Function : Author
Osamu Ishizuka
  • Function : Author
Kyoko Kataoka
  • Function : Author
Fukashi Maeno
  • Function : Author
Molly Mccanta
  • Function : Author
Adam. J. Stinton
  • Function : Author

Abstract

Hole U1395B, drilled southeast of Montserrat during Integrated Ocean Drilling Program Expedition 340, provides a long (>1 Ma) and detailed record of eruptive and mass-wasting events (>130 discrete events). This record can be used to explore the temporal evolution in volcanic activity and landslides at an arc volcano. Analysis of tephra fall and volcaniclastic turbidite deposits in the drill cores reveals three heightened periods of volcanic activity on the island of Montserrat (∼930 to ∼900 ka, ∼810 to ∼760 ka, and ∼190 to ∼120 ka) that coincide with periods of increased volcano instability and mass-wasting. The youngest of these periods marks the peak in activity at the Soufrière Hills volcano. The largest flank collapse of this volcano (∼130 ka) occurred toward the end of this period, and two younger landslides also occurred during a period of relatively elevated volcanism. These three landslides represent the only large (>0.3 km3) flank collapses of the Soufrière Hills edifice, and their timing also coincides with periods of rapid sea level rise (>5 m/ka). Available age data from other island arc volcanoes suggest a general correlation between the timing of large landslides and periods of rapid sea level rise, but this is not observed for volcanoes in intraplate ocean settings. We thus infer that rapid sea level rise may modulate the timing of collapse at island arc volcanoes, but not in larger ocean-island settings.
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insu-03581315 , version 1 (19-02-2022)

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Maya Coussens, Deborah Wall-Palmer, Peter. J. Talling, Sebastian. F. L. Watt, Michael Cassidy, et al.. The relationship between eruptive activity, flank collapse, and sea level at volcanic islands: A long-term (>1 Ma) record offshore Montserrat, Lesser Antilles. Geochemistry, Geophysics, Geosystems, 2016, 17, pp.2591-2611. ⟨10.1002/2015GC006053⟩. ⟨insu-03581315⟩
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