H y d r o g r a p h ic s u r v e y s fin d 3 0 0 m d

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Unformatted text preview: e e p d e p r e s s io n w h e r e th e is la n d w a s o n c e 3 0 0 m a b o v e s e a le v e l U p to 4 0 m o f p u m ic e d e p o s its o n s e a flo o r V e r b e e k e s tim a te s 2 5 k m3 e r u p tio n ; m o d e r n e s tim a te s u p to 3 0 k m 3 . Anak Krakatau 8 Questions Krakatau provides an example of a calderaforming ultraplinian forming eruption, but What caused the explosions? What caused the tsunamis? Why were people burned 40 km away? What was the role of seawater? Possible Scenarios E x p lo s io n s , t s u n a m is c a u s e d b y Caldera collapse Submarine explosion (fuel-coolant reaction as seawater comes in contact with magma) Plinian column collapse and pyroclastic flows entering the sea These are not necessarily mutually exclusive B u r n s c a u s e d b y p y r o c la s tic flo w s a n d /o r s u r g e s tr a v e llin g a c r o s s th e s e a fo r 4 0 k m Implies flows were less dense than seawater or supported by gas pillow generated by vaporizing seawater. 9 Subsequent Research Both subareal and submarine deposits are similar;...
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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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