Geophysicists blast their way to the bottom of tectonic plates
![Seismic ship working off New Zealand's Wellington coast](http://images.iop.org/objects/phw/news/thumb/19/2/8/PW-2015-02-11-randall-tectonic-ship.jpg)
A thin, low-viscosity layer at the base of a tectonic plate has been imaged at a depth of 100 km beneath North Island, New Zealand, by an international team of researchers. Using underground dynamite explosions, the high-resolution seismic imaging – which has revealed previously unknown information about what happens underneath tec
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