Pelee 1902 4m 0m 1m 3 days after the may 8 eruption

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Unformatted text preview: ; signs of increased activity since 1889; by March 1902 crater lake, Etang Sec, just below the summit had had fumeroles. First explosions on April 23 (these lacked juvenile material); small cone and lake noted in Etang Sec on April 27; steady increase in activity through early May. Lahar from Etang Sec raced down Riviere Blanche on May 5, killing 23. May 6: first explosions releasing juvenile magma. Dome began building and produced pyroclastic flows down the Riviere Blanche. May 8, 1902 “Cloud” observed to “pass out” of crater p r o b a b ly a r e s u lt o f th e e x p lo s iv e c o lla p s e o f th e d o m e . T h is c lo u d g e n e r a te d a p y r o c la s tic flo w ( b lo c k a n d a s h flo w ) th a t w a s to p o g r a p h ic a lly c o n fin e d to th e R iv ie r e B la n c h e v a lle y . A s s o c ia te d w ith th e flo w w a s a d ilu te ( n o te th in a s h c o v e r ) , tu r b u le n t p y r o c la s tic s u r g e t h a t s p r e a d la te r a lly fr o m th e m a in b o d y o f th e flo w , d e s tr o y in g S t. P ie r r e . A s e c o n d f lo w /s u r g e o n M a y 2 0 d id m o r e p h y s ic a l d a m a g e . 15 Deposits of May 8 1902 Eruption Stratigraphic Column of May 8 Deposits 16 Model of Fisher et al., 1980 Conclusion: St. Pierre destroyed by ash-cloud surge associated with block and ash flow down the Riviere Blanche Valley Lateral Blasts L a te r a l b la s ts o c c u r w h e n d e c o m p r e s s in g m a g m a is d ir e c te d la te r a lly r a th e r th a n v e r tic a lly . 17 18...
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This document was uploaded on 03/04/2014 for the course EAS 458 at Cornell University (Engineering School).

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