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Upper mantle compressional velocity structure beneath the West Mediterranean Basin

Pino, N. Alessandro and Helmberger, Donald V. (1997) Upper mantle compressional velocity structure beneath the West Mediterranean Basin. Journal of Geophysical Research B, 102 (B2). pp. 2953-2967. ISSN 0148-0227. https://resolver.caltech.edu/CaltechAUTHORS:20121128-104350830

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Abstract

P waveforms of regional crustal earthquakes have been modeled to obtain an upper mantle compressional velocity model for the West Mediterranean Basin. Data come from long-period stations of the World-Wide Standardized Seismograph Network and broadband stations located in the Iberian Peninsula. Synthetic waveforms have first been computed for published velocity models corresponding to different tectonic provinces and obtained with analogous techniques. A model that strongly improves the fits to the data is then derived. The proposed model is characterized by a 100-km-thick lid overlaying a not very pronounced low-velocity zone and a 3% discontinuity at 368 km where an increase of the velocity gradient also occurs. These features could be explained either as a deflection of the olivine-to-spinel phase transition, regionally detected at about 395 km, resulting from the lower temperature produced by the subduction of the African plate, or as being due to the presence below 300 km depth of a layer of silicate melt, producing a strong reflection from its bottom, and a more usual depth for the olivine-spinel transition. In both cases the occurrence of relatively low velocities beneath 300 km is interpreted as being caused by the presence of melt associated with the northward dipping subduction of the African plate.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1029/96JB03461DOIUNSPECIFIED
http://www.agu.org/pubs/crossref/1997/96JB03461.shtmlPublisherUNSPECIFIED
Additional Information:© 1997 American Geophysical Union. Received 30 April 1996; revised October 25, 1996; accepted 6 November 1996 N. A. P. wishes to thank all the people at the Seismolab, faculty, staff, and students, who made his nine-month stay a very pleasant experience.
Issue or Number:B2
Record Number:CaltechAUTHORS:20121128-104350830
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20121128-104350830
Official Citation:Pino, N. A. and D. V. Helmberger (1997), Upper mantle compressional velocity structure beneath the West Mediterranean Basin, J. Geophys. Res., 102(B2), 2953–2967, doi:10.1029/96JB03461.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:35707
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:28 Nov 2012 18:53
Last Modified:03 Oct 2019 04:30

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