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SUMMARY:A seismic image for the base of an oceanic plate from high resolut
 ion\, shot-generated\, seismic reflection waves - Prof Tim Stern\, Victori
 a University of Wellington
DTSTART:20150520T150000Z
DTEND:20150520T160000Z
UID:TALK58995@talks.cam.ac.uk
CONTACT:David Al-Attar
DESCRIPTION:Seismic probing of the lithosphere-asthenosphere boundary ( LA
 B) has to date been based on conversions of  earthquake-generated seismic 
 waves. Typical frequencies used are less than 1Hz. In this study we take a
  different approach and use large ( 500 kg) explosive charges recorded by 
 a  900 seismograph array to image the base of the oceanic plate ( beneath 
 eastern North Island\, New Zealand) with ~ 14 Hz waves. The sharpness\, th
 e character and depth of the LAB contribute to some revised views on   how
  the oceanic LAB works. 
LOCATION:Marine/Wolfson Building lecture hall
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