Physical Volcanology by L. CIVETTA, P. GASPARINI, G. LUONGO and A. RAPOLLA (Eds.)

By L. CIVETTA, P. GASPARINI, G. LUONGO and A. RAPOLLA (Eds.)

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T h e 1 9 4 8 H u k u i aftershocks and o t h e r t e c t o n i c q u a k e s o r i g i n a t i n g in t h e l o w e r c r u s t a n d m a n t l e h a v e generally d i s t i n c t l y l o w e r m values. T h e I s h i m o t o — I i d a r e l a t i o n w a s also a p p l i e d t o B - t y p e q u a k e s a t A s a m a , S a k u r a - z i m a , a n d Kilauea. 5 t o 4 . 5 , t h i s b e i n g r e m a r k a b l y high c o m p a r e d n o t o n l y w i t h t e c t o n i c b u t also w i t h A - t y p e q u a k e s .

Frequency curve from the seismograms of Fig. 7. 2 k m / s e c is t h e p r o b a b l e v e l o c i t y of R a y l e i g h waves in t h i s r e g i o n . O n t h e other hand, volcanic micro-earthquakes have been observed near or w i t h i n t h e a c t i v e c r a t e r b y K i k u c h i ( 1 9 6 3 ) , using s h o r t - p e r i o d geophones. These micro-earthquakes a n d t h e t y p e 3 volcanic t r e m o r s can b e o b s e r v e d s i m u l t a n e o u s l y , t h e r e b e i n g a o n e - t o - o n e c o r r e s p o n d e n c e bet w e e n b o t h w a v e s .

T h i s fact suggests t h a t t h i s o s c i l l a t i o n s y s t e m h a s a v e r y small d a m p i n g f a c t o r , since t h e p r e d i c t e d d a m p e d o s c i l l a t i o n s y s t e m c a n b e r e g a r d e d as a n a p p r o x i m a t e l y free o s c i l l a t i o n s y s t e m . F r o m a u t o - c o r r e l o g r a m s ( F i g . 4 ) it c a n also b e p r e s u m e d t h a t t h e p r e d i c t e d d a m p e d o s c i l l a t i o n s y s t e m h a s a v e r y small d a m p i n g f a c t o r .

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