Aotearoa New Zealand's largest fault, the Hikurangi Subduction Zone (HSZ), is where the Pacific tectonic plate dives west beneath the Australian plate and underneath the east coast of the North Island.
caught in the act of subducting beneath the shallow part of the Hikurangi margin and forms sediment lenses in its wake that appear to enhance slow slip.paper the NZ3D data reveal a detailed map of the deeper parts plate interface that shows that it has kilometer-high hill and valleys.
The new finding suggests that subducting plate of volcanic rocks act as amplified source of water that influences the slip behavior of the margin. The trapped water is under pressure and results in the plate boundary being weak and prone to unlocking and sliding in slow slip. The study highlights the presence of significant water delivery to slow slip source from the incoming Pacific, that were previously unknown.
By understanding how the slip behavior varies along the subduction zone, it allows scientists to better diagnose and pinpoint areas that are more prone to generate large earthquakes. Henrys says,"Our unique 3D seismic data, acquired offshore Gisborne along the northern Hikurangi subduction zone, is providing breakthroughs in understanding of the physical processes that control earthquakes. Globallyare where one plate dives beneath another and can rupture in devastating earthquakes and tsunami like those in Sumatra and Japan ."
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