The focal mechanism of earthquakes in the southern coast of the Iberian Peninsula
1967; Elsevier BV; Volume: 4; Issue: 3 Linguagem: Inglês
10.1016/0040-1951(67)90031-5
ISSN1879-3266
Autores Tópico(s)earthquake and tectonic studies
ResumoAbstract A group of 23 earthquakes in the southern coast of the Iberian Peninsula from 1962 to 1964 are studied in order to determine the characteristics of the regional stresses. The largest of these earthquakes which occurred in March 15, 1964, with magnitude M = 7.1, has been used in the determination of the focal mechanism using P- and S-wave data. For this analysis a new computer program was used which finds a solution for the orientation of a point source based on the polarization of the S-wave and the sign of the first arrival of P. The principal axes of stresses derived from this solution are related to the strike of the Guadalquivir fault confirming the presumption of a southwest continuation of this fault. The analysis of the smaller earthquakes does not support the view of a homogeneous mechanism for all earthquakes in this region.
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