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Along‐arc heterogeneity in local seismicity across the Lesser Antilles Subduction Zone from a dense ocean‐bottom seismometer network

Along‐arc heterogeneity in local seismicity across the Lesser Antilles Subduction Zone from a dense ocean‐bottom seismometer network
Along‐arc heterogeneity in local seismicity across the Lesser Antilles Subduction Zone from a dense ocean‐bottom seismometer network
The Lesser Antilles arc is only one of two subduction zones where slow‐spreading Atlantic lithosphere is consumed. Slow‐spreading may result in the Atlantic lithosphere being more pervasively and heterogeneously hydrated than fast‐spreading Pacific lithosphere, thus affecting the flux of fluids into the deep mantle. Understanding the distribution of seismicity can help unravel the effect of fluids on geodynamic and seismogenic processes. However, a detailed view of local seismicity across the whole Lesser Antilles subduction zone is lacking. Using a temporary ocean‐bottom seismic network we invert for hypocenters and 1D velocity model. A systematic search yields a 27 km thick crust, reflecting average arc and back‐arc structures. We find abundant intraslab seismicity beneath Martinique and Dominica, which may relate to the subducted Marathon and/or Mercurius Fracture Zones. Pervasive seismicity in the cold mantle wedge corner and thrust seismicity deep on the subducting plate interface suggest an unusually wide megathrust seismogenic zone reaching ∼65km depth. Our results provide an excellent framework for future understanding of regional seismic hazard in eastern Caribbean and the volatile cycling beneath the Lesser Antilles arc.
0895-0695
237–247
Bie, Lidong
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Rietbrock, Andreas
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Hicks, S.E.
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Garth, Thomas
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Harmon, Nicholas
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Rychert, Catherine
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Henstock, Timothy
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Blundy, J.D.
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Goes, Saskia
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Collier, J.S.
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Davidson, J
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Allen, R
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Clouard, V.
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Kendall, Mike
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MacPherson, C.
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Van Hunen, Jeroen
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Krüger, Frank
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Bie, Lidong
c86a2fa9-3fd4-4efd-b606-04b27ecc2c92
Rietbrock, Andreas
e4656f22-06be-40fe-8f98-7f88c351c434
Hicks, S.E.
1967e5e4-8cdb-46f0-9c16-e7d3d052d480
Garth, Thomas
06c5b0c6-d7a3-4050-9009-50addc6e6fbc
Harmon, Nicholas
10d11a16-b8b0-4132-9354-652e72d8e830
Rychert, Catherine
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Henstock, Timothy
27c450a4-3e6b-41f8-97f9-4e0e181400bb
Blundy, J.D.
d38d64fc-a211-4ed7-9e05-0d55209a8b2a
Goes, Saskia
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Collier, J.S.
19dfa4bb-f743-4ca8-b15f-0f72f3f7263c
Davidson, J
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Allen, R
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Clouard, V.
67bed958-e4cc-4185-bbe5-218746a83f64
Kendall, Mike
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MacPherson, C.
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Van Hunen, Jeroen
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Krüger, Frank
a38e08d8-36bc-49f5-8174-583f103780c8

Bie, Lidong, Rietbrock, Andreas, Hicks, S.E., Garth, Thomas, Harmon, Nicholas, Rychert, Catherine, Henstock, Timothy, Blundy, J.D., Goes, Saskia, Collier, J.S., Davidson, J, Allen, R, Clouard, V., Kendall, Mike, MacPherson, C., Van Hunen, Jeroen and Krüger, Frank (2020) Along‐arc heterogeneity in local seismicity across the Lesser Antilles Subduction Zone from a dense ocean‐bottom seismometer network. Seismological Research Letters, 91 (1), 237–247. (doi:10.1785/0220190147).

Record type: Article

Abstract

The Lesser Antilles arc is only one of two subduction zones where slow‐spreading Atlantic lithosphere is consumed. Slow‐spreading may result in the Atlantic lithosphere being more pervasively and heterogeneously hydrated than fast‐spreading Pacific lithosphere, thus affecting the flux of fluids into the deep mantle. Understanding the distribution of seismicity can help unravel the effect of fluids on geodynamic and seismogenic processes. However, a detailed view of local seismicity across the whole Lesser Antilles subduction zone is lacking. Using a temporary ocean‐bottom seismic network we invert for hypocenters and 1D velocity model. A systematic search yields a 27 km thick crust, reflecting average arc and back‐arc structures. We find abundant intraslab seismicity beneath Martinique and Dominica, which may relate to the subducted Marathon and/or Mercurius Fracture Zones. Pervasive seismicity in the cold mantle wedge corner and thrust seismicity deep on the subducting plate interface suggest an unusually wide megathrust seismogenic zone reaching ∼65km depth. Our results provide an excellent framework for future understanding of regional seismic hazard in eastern Caribbean and the volatile cycling beneath the Lesser Antilles arc.

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Bie 2019 srl final - Accepted Manuscript
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Accepted/In Press date: 3 November 2019
e-pub ahead of print date: 13 November 2019
Published date: 1 January 2020

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Local EPrints ID: 439451
URI: http://eprints.soton.ac.uk/id/eprint/439451
ISSN: 0895-0695
PURE UUID: b3ac2caf-d9c0-42b8-8ab2-89fe24a43913
ORCID for Nicholas Harmon: ORCID iD orcid.org/0000-0002-0731-768X
ORCID for Timothy Henstock: ORCID iD orcid.org/0000-0002-2132-2514

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Date deposited: 23 Apr 2020 16:33
Last modified: 02 Nov 2020 05:01

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Contributors

Author: Lidong Bie
Author: Andreas Rietbrock
Author: S.E. Hicks
Author: Thomas Garth
Author: Nicholas Harmon ORCID iD
Author: J.D. Blundy
Author: Saskia Goes
Author: J.S. Collier
Author: J Davidson
Author: R Allen
Author: V. Clouard
Author: Mike Kendall
Author: C. MacPherson
Author: Jeroen Van Hunen
Author: Frank Krüger

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