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  • American Geophysical Union (AGU)  (3)
Materialart
Verlag/Herausgeber
  • American Geophysical Union (AGU)  (3)
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Sprache
Erscheinungszeitraum
  • 1
    Online-Ressource
    Online-Ressource
    Mount Etna dense array local earthquake P and S tomography and implications for volcanic plumbing
    American Geophysical Union (AGU) ; 2000
    In:  Journal of Geophysical Research: Solid Earth Vol. 105, No. B9 ( 2000-09-10), p. 21633-21646
    Details
    In: Journal of Geophysical Research: Solid Earth, American Geophysical Union (AGU), Vol. 105, No. B9 ( 2000-09-10), p. 21633-21646
    Kurzfassung: Inversion for the three‐dimensional velocity structure of Mount Etna is performed with a data set of arrival times of P and S waves of local earthquakes from temporary dense arrays of three‐component seismographs. A high‐ V p body revealed by the original tomography without nearby stations is confirmed, and its image is sharpened using new velocity constraints provided by refraction data. Synthetic tests of V p and V p / V s and comparison with an independent artificial source tomography with a fundamentally different geometry consistently calibrate the significance threshold of the resolution indicators. The trustworthy part of the image shows a high‐ V p body centered under the southern part of Valle del Bove above the 6 km below sea level deep basement, which extends towards sea level and may be rooted in or through the crust. It has a large contrast of over 1 km/s with the surrounding sediments and sharp lateral limits and can thus be regarded as made of intrusive material of magmatic origin. The massive high‐ V p body is heterogeneous in V p / V s . The regions inside it where V s is relatively low can then be suspected of containing a proportion of melt or be fractured and act as pressure links or transport zones. Such features may be structurally linked and appear to be activated in eruptive phenomena. By taking into account the heterogeneities in structure and physical state retrieved by seismic tomography a succession of seismic events, deformational episodes, and geochemical variation in lavas can be discussed with respect to the well‐observed eruptions.
    Materialart: Online-Ressource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/2000JB900190
    Sprache: Englisch
    Verlag: American Geophysical Union (AGU)
    Publikationsdatum: 2000
    ZDB Id: 2033040-6
    ZDB Id: 3094104-0
    ZDB Id: 2130824-X
    ZDB Id: 2016813-5
    ZDB Id: 2016810-X
    ZDB Id: 2403298-0
    ZDB Id: 2016800-7
    ZDB Id: 161666-3
    ZDB Id: 161667-5
    ZDB Id: 2969341-X
    ZDB Id: 161665-1
    ZDB Id: 3094268-8
    ZDB Id: 710256-2
    ZDB Id: 2016804-4
    ZDB Id: 3094181-7
    ZDB Id: 3094219-6
    ZDB Id: 3094167-2
    ZDB Id: 2220777-6
    ZDB Id: 3094197-0
    SSG: 16,13
    Standort Signatur Einschränkungen Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Online-Ressource
  • 2
    Online-Ressource
    Online-Ressource
    Triple junction and ridge hotspots: Earthquakes, faults, and volcanism in Afar, the Azores, and Iceland
    American Geophysical Union (AGU) ; 1993
    In:  Journal of Geophysical Research: Solid Earth Vol. 98, No. B7 ( 1993-07-10), p. 11995-12001
    Details
    In: Journal of Geophysical Research: Solid Earth, American Geophysical Union (AGU), Vol. 98, No. B7 ( 1993-07-10), p. 11995-12001
    Kurzfassung: The Afar depression of the Horn of Africa, the Azores Archipelago, and Iceland are zones of plate divergence and mantle plume discharge. Strike‐slip focal mechanisms dominate in major earthquakes. Among nodal planes a particular fault plane can be identified by precise epicentral location, from the strike of the aftershock zone, or by relation to field evidence of active faulting. These fault planes are orthogonal to the directions expected in previous models for transform faults along a continuous divergent plate boundary. Recent volcanic features are consistently at small angles with the fault planes. Rotation of blocks within a deforming zone is implied by the direction of fault planes, the sense of motion along them, and their location on a series of parallel features transverse to the deformed zone. The drift of oceanic or continental large lithospheric plates deforms a zone of lithosphere, deriving from both the plume discharge and ridge accretion while the zone is created.
    Materialart: Online-Ressource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/93JB00373
    Sprache: Englisch
    Verlag: American Geophysical Union (AGU)
    Publikationsdatum: 1993
    ZDB Id: 2033040-6
    ZDB Id: 3094104-0
    ZDB Id: 2130824-X
    ZDB Id: 2016813-5
    ZDB Id: 2016810-X
    ZDB Id: 2403298-0
    ZDB Id: 2016800-7
    ZDB Id: 161666-3
    ZDB Id: 161667-5
    ZDB Id: 2969341-X
    ZDB Id: 161665-1
    ZDB Id: 3094268-8
    ZDB Id: 710256-2
    ZDB Id: 2016804-4
    ZDB Id: 3094181-7
    ZDB Id: 3094219-6
    ZDB Id: 3094167-2
    ZDB Id: 2220777-6
    ZDB Id: 3094197-0
    SSG: 16,13
    Standort Signatur Einschränkungen Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Online-Ressource
  • 3
    Online-Ressource
    Online-Ressource
    Perturbation to the lithosphere along the hotspot track of La Réunion from an offshore‐onshore seismic transect
    American Geophysical Union (AGU) ; 1999
    In:  Journal of Geophysical Research: Solid Earth Vol. 104, No. B2 ( 1999-02-10), p. 2895-2908
    Details
    In: Journal of Geophysical Research: Solid Earth, American Geophysical Union (AGU), Vol. 104, No. B2 ( 1999-02-10), p. 2895-2908
    Kurzfassung: A 250 km long NE‐SW lithospheric transect spanning the 40 km wide island of La Réunion and its submarine edifice is derived from lines of air gun shots at sea on either side, along the assumed hotspot trace. Seismic records were obtained from an array spanning the whole transect and including sea bottom and land receivers, providing a system of reversed and overlapping observations. Low seismic velocity, and hence density, is found on average for the whole edifice above the oceanic plate. We attribute high‐velocity anomalies within the edifice to an intrusive core confined under the central northern quarter of the island‐crossing segment. Unexpectedly, the main seismic interfaces, top and bottom of the prevolcanic crust, do not show significant flexural downwarping under the island. In addition, clear multipathing in the recorded wave field requires the presence of a body with a seismic velocity intermediate between the prevolcanic crustal material and the normal mantle. This lithospheric structure provides the first example where underplating occurs beneath an active volcanic island, suggesting a genetic relationship. The underplated body could represent residues of the evolution of primary picritic melts that yield erupted basalts. Evidence for reflectors deeper in the lithosphere may indicate further related heterogeneity. In the plate/hotspot model commonly assumed, the structural variation along the transect could be interpreted as a variation with time of the amount and physical state of underplated material.
    Materialart: Online-Ressource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/98JB02840
    Sprache: Englisch
    Verlag: American Geophysical Union (AGU)
    Publikationsdatum: 1999
    ZDB Id: 2033040-6
    ZDB Id: 3094104-0
    ZDB Id: 2130824-X
    ZDB Id: 2016813-5
    ZDB Id: 2016810-X
    ZDB Id: 2403298-0
    ZDB Id: 2016800-7
    ZDB Id: 161666-3
    ZDB Id: 161667-5
    ZDB Id: 2969341-X
    ZDB Id: 161665-1
    ZDB Id: 3094268-8
    ZDB Id: 710256-2
    ZDB Id: 2016804-4
    ZDB Id: 3094181-7
    ZDB Id: 3094219-6
    ZDB Id: 3094167-2
    ZDB Id: 2220777-6
    ZDB Id: 3094197-0
    SSG: 16,13
    Standort Signatur Einschränkungen Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Online-Ressource
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