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A seismic image for the base of an oceanic plate from high resolution, shot-generated, seismic reflection waves

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Seismic probing of the lithosphere-asthenosphere boundary ( LAB ) 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, the character and depth of the LAB contribute to some revised views on how the oceanic LAB works.

This talk is part of the Bullard Laboratories Wednesday Colloquia series.

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