Iberian seismicity, 1961 - 1965



This paper compares tlie seismic results corresponding
to 1961-65 with those presented in several a u t h o r ' s prior studies for the
I b e r i a n Peninsula region, which were obtained reducing to a 50 y e a r period
t h e available seismic material up to 1960. The present paper lists 237
e a r t h q u a k e s , a selection between those occurred and recorded; their epic
e n t r a l coordinates, origin time, depth and magnitude f r om body waves;
and a discussion about t h e seismically active quadricles on t h e area, regional
density, epicenter display, annual frequency in steps of % m> t h e parabolic
a d j u s t m e n t for log N, m, tectonic flux and i n t e r m e d i a t e foci location rel
a t e d with the main tectonic features.
1961-65 is a t e n t h of t h e foresaid reduced 50 Y.P. and the present
r e s u l t s agree with t h e preliminary ones, as it was expected; mainly for the
following features: a) migration of maximal density which is Easterly;
b) a s a t i s f a c t o r y parabolic regression for log JVT, m; c) t h e cyclic appearance
r e g a r d i n g annual frequency v a r i a t i o n ; d) continuation of the accumulative
behaviour for the strain release curve during the present period, which
began in 1954; e) seismicity is significatively of an i n t r a l p i n e character,
and /) i n t e r m e d i a t e foci (preliminary determinations) laying out by line
with both: Guadalquivir Fault, SW extension, and Alboran Sea's bottoms

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DOI: https://doi.org/10.4401/ag-4989
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Published by INGV, Istituto Nazionale di Geofisica e Vulcanologia - ISSN: 2037-416X