Contrasts in morphology and deformation offshore Montserrat: New insights from the SEA-CALIPSO marine cruise data

Kenedi, C.L.; Sparks, R.S.J.; Malin, P.E.; Voight, B.; Dean, S.; Minshull, T.; Paulatto, M.; Peirce, C.; Shalev, E.

doi:10.1029/2010gl043925

Contrasts in morphology and deformation offshore Montserrat: New insights from the SEA-CALIPSO marine cruise data

Kenedi, C.L.; Sparks, R.S.J.; Malin, P.E.; Voight, B.; Dean, S.; Minshull, T.; Paulatto, M.; Peirce, C.; Shalev, E.

Authors

C.L. Kenedi

R.S.J. Sparks

P.E. Malin

B. Voight

S. Dean

T. Minshull

M. Paulatto

Professor Christine Peirce christine.peirce@durham.ac.uk
Professor

E. Shalev

Abstract

During the December 2007, SEA-CALIPSO experiment we collected seismic reflection profiles offshore of Montserrat. Off the east coast, we imaged deep fans of volcaniclastic debris from three volcanoes progressively active from ∼2 Ma to present. Near-shelf sedimentation rates of 8–9 cm/ka are approximated following cessation of local volcanic activity. The fans were deposited on sediments with apparent dips towards the ESE-trending Montserrat-Havers fault system (MHFS) in southern Montserrat. The MHFS encloses the Soufrière Hills Volcano, has elevated crustal blocks at Roche's Bluff, St. Georges Hill, and Garibaldi Hill, and extends off the west coast. Off the west coast, the N-dip of two faults supports a N-dip interpretation for a major component of MHFS, the Belham Valley fault. We propose that local deformation is affected by stress redistributions consistent with a right-stepping, sinistral en-echelon fault system, but the interplay of transtension and magmatism has resulted in complex and evolving stress regimes.

Citation

Kenedi, C., Sparks, R., Malin, P., Voight, B., Dean, S., Minshull, T., …Shalev, E. (2010). Contrasts in morphology and deformation offshore Montserrat: New insights from the SEA-CALIPSO marine cruise data. Geophysical Research Letters, 37(19), Article L00E25. https://doi.org/10.1029/2010gl043925

Journal Article Type	Article
Publication Date	Oct 7, 2010
Deposit Date	Oct 1, 2010
Publicly Available Date	Aug 17, 2015
Journal	Geophysical Research Letters
Print ISSN	0094-8276
Electronic ISSN	1944-8007
Publisher	Wiley
Peer Reviewed	Peer Reviewed
Volume	37
Issue	19
Article Number	L00E25
DOI	https://doi.org/10.1029/2010gl043925
Keywords	Reflection, Seismology, Montserrat.

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Copyright Statement
Kenedi, C. L., Sparks, R. S. J., Malin, P., Voight, D., Dean, S., Minshull, T., Paulatto, M., Peirce, C. and Shalev, E. (2010), Contrasts in morphology and deformation offshore Montserrat: New insights from the SEA-CALIPSO marine cruise data, Geophysical Research Letters, 37(19), L00E25, 10.1029/2010GL043925 (DOI). To view the published open abstract, go to http://dx.doi.org and enter the DOI.