Overriding plate structure of the Nicaragua convergent margin: Relationship to the seismogenic zone of the 1992 tsunami earthquake

Overriding plate structure of the Nicaragua convergent margin: Relationship to the seismogenic zone of the 1992 tsunami earthquake

26 pages, 11 figures

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Main Authors: Sallarès, Valentí, Meléndez, Adrià, Prada, Manel, Ranero, César R., McIntosh, Kirk D., Grevemeyer, Ingo
Format: artículo biblioteca
Language:English
Published: American Geophysical Union 2013-09
Subjects:Tsunami earthquake, Wide-angle seismics, Travel time tomography, Convergent margins,
Online Access:http://hdl.handle.net/10261/89904
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spelling dig-icm-es-10261-899042020-12-09T16:53:27Z Overriding plate structure of the Nicaragua convergent margin: Relationship to the seismogenic zone of the 1992 tsunami earthquake Sallarès, Valentí Meléndez, Adrià Prada, Manel Ranero, César R. McIntosh, Kirk D. Grevemeyer, Ingo Tsunami earthquake Wide-angle seismics Travel time tomography Convergent margins 26 pages, 11 figures We present 2-D seismic velocity models and coincident multichannel seismic reflection images of the overriding plate and the inter-plate boundary of the Nicaragua convergent margin along two wide-angle seismic profiles parallel and normal to the trench acquired in the rupture area of the 1992 tsunami earthquake. The trench-perpendicular profile runs over a seamount subducting under the margin slope, at the location where seismological observations predict large coseismic slip. Along this profile, the igneous basement shows increasing velocity both with depth and away from the trench, reflecting a progressive decrease in upper-plate rock degree of fracturing. Upper mantle-like velocities are obtained at ∼10 km depth beneath the fore-arc Sandino basin, indicating a shallow mantle wedge. A mismatch of the inter-plate reflector in the velocity models and along coincident multichannel seismic profiles under the slope is best explained by ∼15% velocity anisotropy, probably caused by subvertical open fractures that may be related to fluid paths feeding known seafloor seepage sites. The presence of a shallow, partially serpentinized mantle wedge, and the fracture-related anisotropy are supported by gravity analysis of velocity-derived density models. The downdip limit of inter-plate seismicity occurs near the tip of the inferred mantle wedge, suggesting that seismicity could be controlled by the presence of serpentinite group minerals at the fault gouge. Near the trench, the inferred local increase of normal stress produced by the subducting seamount in the plate boundary may have made this fault segment unstable during earthquake rupture, which could explain its tsunamigenic character. © 2013. American Geophysical Union. All Rights Reserved The seismic data presented in this work were collected during R/V Maurice Ewing cruise EW00–05 funded by NSF and German Science Foundation (DFG). A.M. has been supported by Kaleidoscope project financed by Repsol, and M.P. by the FPI programme of the Spanish Ministry of Science and Innovation (MICINN). Part of the work has been done in the framework of the MICINN-funded projects MEDOC (CTM2007–66179-C02-01/MAR and CTM2007–66179-C02-02/MAR) and HADES (CTM2011–30400-C02-01 and CTM2011–30400-C02-02) Peer Reviewed 2014-01-24T11:15:53Z 2014-01-24T11:15:53Z 2013-09 2014-01-24T11:15:53Z artículo http://purl.org/coar/resource_type/c_6501 doi: 10.1002/ggge.20214 issn: 1525-2027 Geochemistry, Geophysics, Geosystems 14(9): 3436-3461 (2013) http://hdl.handle.net/10261/89904 10.1002/ggge.20214 en https://doi.org/10.1002/ggge.20214 open American Geophysical Union
institution ICM ES
collection DSpace
country España
countrycode ES
component Bibliográfico
access En linea
databasecode dig-icm-es
tag biblioteca
region Europa del Sur
libraryname Biblioteca del ICM España
language English
topic Tsunami earthquake
Wide-angle seismics
Travel time tomography
Convergent margins
Tsunami earthquake
Wide-angle seismics
Travel time tomography
Convergent margins
spellingShingle Tsunami earthquake
Wide-angle seismics
Travel time tomography
Convergent margins
Tsunami earthquake
Wide-angle seismics
Travel time tomography
Convergent margins
Sallarès, Valentí
Meléndez, Adrià
Prada, Manel
Ranero, César R.
McIntosh, Kirk D.
Grevemeyer, Ingo
Overriding plate structure of the Nicaragua convergent margin: Relationship to the seismogenic zone of the 1992 tsunami earthquake
description 26 pages, 11 figures
format artículo
topic_facet Tsunami earthquake
Wide-angle seismics
Travel time tomography
Convergent margins
author Sallarès, Valentí
Meléndez, Adrià
Prada, Manel
Ranero, César R.
McIntosh, Kirk D.
Grevemeyer, Ingo
author_facet Sallarès, Valentí
Meléndez, Adrià
Prada, Manel
Ranero, César R.
McIntosh, Kirk D.
Grevemeyer, Ingo
author_sort Sallarès, Valentí
title Overriding plate structure of the Nicaragua convergent margin: Relationship to the seismogenic zone of the 1992 tsunami earthquake
title_short Overriding plate structure of the Nicaragua convergent margin: Relationship to the seismogenic zone of the 1992 tsunami earthquake
title_full Overriding plate structure of the Nicaragua convergent margin: Relationship to the seismogenic zone of the 1992 tsunami earthquake
title_fullStr Overriding plate structure of the Nicaragua convergent margin: Relationship to the seismogenic zone of the 1992 tsunami earthquake
title_full_unstemmed Overriding plate structure of the Nicaragua convergent margin: Relationship to the seismogenic zone of the 1992 tsunami earthquake
title_sort overriding plate structure of the nicaragua convergent margin: relationship to the seismogenic zone of the 1992 tsunami earthquake
publisher American Geophysical Union
publishDate 2013-09
url http://hdl.handle.net/10261/89904
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AT pradamanel overridingplatestructureofthenicaraguaconvergentmarginrelationshiptotheseismogeniczoneofthe1992tsunamiearthquake
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