By Stuart Strahl, Silvia Beaujon
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Extra info for The cracidae : their biology and conservation
1 9 6 5 . Some natures of volcanic earthquakes at Sakura-zima Volcano. Disaster Prev. Res. , 8: 35—41. Chapter 2 VOLCANIC TREMORS AT ASO VOLCANO AKIRA KUBOTERA Aso Volcanological Laboratory, Kyoto University, Kyoto (Japan) VOLCANIC TREMORS C o n t i n u o u s or isolated sinusoidal wave trains are usually recorded by s e i s m o m e t r i c o b s e r v a t i o n s n e a r active v o l c a n o e s . D u r i n g t h e active p e r i o d , t h e f r e q u e n c y of s u c h waves increases c o n s i d e r a b l y .
8. Displacement-amplitude vs. 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 .
I n e q . l , F(co) can b e d e r i v e d f r o m t h e c h a r a c t e r i s t i c curves of t h e s e i s m o g r a p h . E x a m p l e s of a n a n a l y z e d s p e c t r u m of t h e t y p e 2 v o l c a n i c t r e m o r are s h o w n in F i g . 3 , w h e r e r e d u c e d a m p l i t u d e vs. p e r i o d are p l o t t e d o n a l o g a r i t h m i c scale. * According to Tazime's "quarter wave-length law" ( 1 9 5 6 , 1 9 5 7 ) the asymptotic values of the Airy phase period are: T O R = 2 .
The cracidae : their biology and conservation by Stuart Strahl, Silvia Beaujon