부산대학교 도서관

This paper compares tlie seismic results correspondingto 1961-65 with those presented in several a u t h o r ' s prior studies for theI b e r i a n Peninsula region, which were obtained reducing to a 50 y e a r periodt h e available seismic material up to 1960. The present paper lists 237e a r t h q u a k e s , a selection between those occurred and recorded; their epice 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, regionaldensity, epicenter display, annual frequency in steps of % m> t h e parabolica 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 rela 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 presentr e s u l t s agree with t h e preliminary ones, as it was expected; mainly for thefollowing 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 appearancer e g a r d i n g annual frequency v a r i a t i o n ; d) continuation of the accumulativebehaviour for the strain release curve during the present period, whichbegan 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 linewith both: Guadalquivir Fault, SW extension, and Alboran Sea's bottoms