Multiple plates subducting beneath Colombia, as illuminated by seismicity and velocity from the joint inversion of seismic and gravity data

Ellen M. Syracuse, Monica Maceira, Germán A. Prieto, Haijiang Zhang, Charles J. Ammon

Resultado de la investigación: Contribución a una revistaArtículo

32 Citas (Scopus)

Resumen

2016 Publicado por Elsevier B.V. La subducción bajo los Andes más septentrionales de Colombia es compleja. Basado en las distribuciones de la sismicidad, múltiples segmentos de la losa parecen estar subductores, y el volcanismo del arco cesa al norte de 5° N. Aquí, iluminamos el sistema de subducción a través de reubicaciones hipocéntricas y modelos Vp y Vs que resultan de la inversión conjunta de las llegadas de ondas del cuerpo local, mediciones de dispersión de ondas superficiales y datos de gravedad. El uso simultáneo de múltiples tipos de datos aprovecha las diferentes sensibilidades de cada tipo de datos, resultando en modelos de velocidad que han mejorado la resolución tanto a profundidades más bajas como a profundidades más profundas que las que resultaría de la tomografía tradicional de tiempo de viaje sola. El conjunto de datos sísmicos y el modelo de velocidad reubicados indican claramente un desgarro en la losa de Nazca a 5° N, que corresponde a un cambio de 250 km en la sismicidad de la losa y a la terminación del volcanismo de arco. Al norte de este desgarro, la losa es plana, y está compuesta por losas de dos fuentes: las placas de Nazca y del Caribe. El nido de Bucaramanga, una pequeña región de entre las más intensas de sismicidad de profundidad intermedia a nivel mundial, está asociado con el límite entre estas dos placas y posiblemente con una zona de derretimiento o con un elevado contenido de agua, basado en la reducción de Vp y el aumento de Vp/Vs. También utilizamos la sismicidad reubicada para identificar dos nuevas fallas en la placa sudamericana, una relacionada con la convergencia de las placas y otra destacada por la sismicidad inducida.
Idioma originalInglés estadounidense
Páginas (desde-hasta)139-149
Número de páginas11
PublicaciónEarth and Planetary Science Letters
Volumen444
DOI
EstadoPublicada - jun 15 2016

Huella dactilar

Colombia
seismicity
slab
Gravitation
slabs
inversions
gravity
gravitation
Relocation
Travel time
volcanism
subduction
Surface waves
arcs
Water content
Tomography
Earthquakes
Melting
Nazca plate
induced seismicity

Citar esto

Syracuse, Ellen M. ; Maceira, Monica ; Prieto, Germán A. ; Zhang, Haijiang ; Ammon, Charles J. / Multiple plates subducting beneath Colombia, as illuminated by seismicity and velocity from the joint inversion of seismic and gravity data. En: Earth and Planetary Science Letters. 2016 ; Vol. 444. pp. 139-149.
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abstract = "{\circledC} 2016 Published by Elsevier B.V.Subduction beneath the northernmost Andes in Colombia is complex. Based on seismicity distributions, multiple segments of slab appear to be subducting, and arc volcanism ceases north of 5° N. Here, we illuminate the subduction system through hypocentral relocations and Vp and Vs models resulting from the joint inversion of local body wave arrivals, surface wave dispersion measurements, and gravity data. The simultaneous use of multiple data types takes advantage of the differing sensitivities of each data type, resulting in velocity models that have improved resolution at both shallower and deeper depths than would result from traditional travel time tomography alone. The relocated earthquake dataset and velocity model clearly indicate a tear in the Nazca slab at 5° N, corresponding to a 250-km shift in slab seismicity and the termination of arc volcanism. North of this tear, the slab is flat, and it comprises slabs of two sources: the Nazca and Caribbean plates. The Bucaramanga nest, a small region of among the most intense intermediate-depth seismicity globally, is associated with the boundary between these two plates and possibly with a zone of melting or elevated water content, based on reduced Vp and increased Vp/Vs. We also use relocated seismicity to identify two new faults in the South American plate, one related to plate convergence and one highlighted by induced seismicity.",
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Multiple plates subducting beneath Colombia, as illuminated by seismicity and velocity from the joint inversion of seismic and gravity data. / Syracuse, Ellen M.; Maceira, Monica; Prieto, Germán A.; Zhang, Haijiang; Ammon, Charles J.

En: Earth and Planetary Science Letters, Vol. 444, 15.06.2016, p. 139-149.

Resultado de la investigación: Contribución a una revistaArtículo

TY - JOUR

T1 - Multiple plates subducting beneath Colombia, as illuminated by seismicity and velocity from the joint inversion of seismic and gravity data

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AU - Maceira, Monica

AU - Prieto, Germán A.

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AU - Ammon, Charles J.

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N2 - © 2016 Published by Elsevier B.V.Subduction beneath the northernmost Andes in Colombia is complex. Based on seismicity distributions, multiple segments of slab appear to be subducting, and arc volcanism ceases north of 5° N. Here, we illuminate the subduction system through hypocentral relocations and Vp and Vs models resulting from the joint inversion of local body wave arrivals, surface wave dispersion measurements, and gravity data. The simultaneous use of multiple data types takes advantage of the differing sensitivities of each data type, resulting in velocity models that have improved resolution at both shallower and deeper depths than would result from traditional travel time tomography alone. The relocated earthquake dataset and velocity model clearly indicate a tear in the Nazca slab at 5° N, corresponding to a 250-km shift in slab seismicity and the termination of arc volcanism. North of this tear, the slab is flat, and it comprises slabs of two sources: the Nazca and Caribbean plates. The Bucaramanga nest, a small region of among the most intense intermediate-depth seismicity globally, is associated with the boundary between these two plates and possibly with a zone of melting or elevated water content, based on reduced Vp and increased Vp/Vs. We also use relocated seismicity to identify two new faults in the South American plate, one related to plate convergence and one highlighted by induced seismicity.

AB - © 2016 Published by Elsevier B.V.Subduction beneath the northernmost Andes in Colombia is complex. Based on seismicity distributions, multiple segments of slab appear to be subducting, and arc volcanism ceases north of 5° N. Here, we illuminate the subduction system through hypocentral relocations and Vp and Vs models resulting from the joint inversion of local body wave arrivals, surface wave dispersion measurements, and gravity data. The simultaneous use of multiple data types takes advantage of the differing sensitivities of each data type, resulting in velocity models that have improved resolution at both shallower and deeper depths than would result from traditional travel time tomography alone. The relocated earthquake dataset and velocity model clearly indicate a tear in the Nazca slab at 5° N, corresponding to a 250-km shift in slab seismicity and the termination of arc volcanism. North of this tear, the slab is flat, and it comprises slabs of two sources: the Nazca and Caribbean plates. The Bucaramanga nest, a small region of among the most intense intermediate-depth seismicity globally, is associated with the boundary between these two plates and possibly with a zone of melting or elevated water content, based on reduced Vp and increased Vp/Vs. We also use relocated seismicity to identify two new faults in the South American plate, one related to plate convergence and one highlighted by induced seismicity.

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