14/05/2021

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The New Hebrides Subduction Zone is extremely active, producing over 20 earthquakes of magnitude 7 or higher in just the past 25 years.

The Coriolis Troughs of the New Hebrides subduction zone

The Coriolis Troughs of the New Hebrides subduction zone are among the youngest backarc rifts in the world.

They reach depths of >3 km, despite their small size (<100 km in length and only 25–45 km wide) and their proximity to the arc front (∼50 km).

The narrow, deep graben morphology is characteristic of magma-deficient arc rifts in the early stages of backarc extension, where the rate of extension and subsidence exceeds the magmatic input.

Unexpectedly, the youngest graben, the Vate Trough, contains a centrally-located 1000-m tall and 14-km wide shield volcano with a large, 5×8 km breached summit caldera.

The New Hebrides Subduction Zone is extremely active, producing over 20 earthquakes of magnitude 7 or higher in just the past 25 years.

Source: Earth and Planetary Science Letters