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A study based on refraction seismics has been carried out in the region of Olot, where the youngest volcanic materials in the Iberian Peninsula outcrop. The aims were not only to understand the structure of the upper crust, but also to test the degree of resolution of structural variations in a zone poorly known at depth, by a moderate-cost seismic technique. The results from the seismic profiles illustrate the global structure of the upper crust, with lateral variations associated with the volcanic zone. On the other hand, the device based on the Expanding Spread Profiles technique does not provide a structural picture sufficiently continuous at depth, due to wide intervals of sampling in a rapidly varying continental area. As 3-component stations were used, a second interpretation can be undertaken, based on the analysis of individual seismograms and considering the S waves. The relationship VP/VS, and in particular the particle motion and the waves converted from P to S, provide independent structural constraints. The results indicate that these techniques may in fact be more useful for resolving local variations of short wavelength if a high density device is available.

Additional information

Authors: GALLART J, Universitat de Barcelona (ES);HIRN A, Institut de Physique du Globe de Paris (FR)
Bibliographic Reference: EUR 12227 FR (1990) 103 pp., MF, ECU 8
Availability: (2)
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