Open AccessCrust‐Mantle Velocities in the Iberian Peninsula and Tectonic Implications of the Seismicity in this Area
Author(s) -
Payo Gonzalo
Publication year - 1972
Publication title -
geophysical journal of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.302
H-Index - 168
eISSN - 1365-246X
pISSN - 0016-8009
DOI - 10.1111/j.1365-246x.1972.tb06181.x
Subject(s) - geology , crust , seismology , induced seismicity , mantle (geology) , asthenosphere , tectonics , aftershock , peninsula , geophysics , subduction , history , archaeology
Summary Twenty‐five clear aftershocks of the earthquake of 1969 March 28 at the Azores‐Gibraltar fracture are used to determine the crustal velocities between the epicentral zone and the standard stations TOL, MAL and PTO. These values, added to those previously obtained, make it possible now to provide a summary of crust‐mantle velocities for the Iberian region; and a regional model for the crust and first layers of the mantle is tentatively presented. The residuals of the deep earthquake on 1954 March 29 strengthens the idea of the existence of a low velocity channel for P waves in the asthenosphere, which seems to be of irregular thickness. The recent seismicity of this region, mainly distributed along the Azores‐Gibraltar‐Algerie line and south‐eastern Spain, leads to the postulation of the existence of a small subplate (the Alboran subplate), which is considered to have formed part, in past times, of the large African plate.