Subduction in Central Kermadec: Crustal Structures from the Incoming Plate and the Arc-Backarc Region From Wide-Angel Seismics.

Scherwath, Martin, Kopp, Heidrun , Flueh, Ernst R. and Henrys, S. A. (2007) Subduction in Central Kermadec: Crustal Structures from the Incoming Plate and the Arc-Backarc Region From Wide-Angel Seismics. [Poster] In: AGU Fall Meeting 2007. , 10.-14.12.2007, San Francisco, USA .

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Abstract

The central part of the 2500-km long Tonga-Kermadec Trench is characterized by the subduction of the Louisville Ridge and unusually large seismicity approximately 200-300 km to the south of this ridge subduction. From this region we show preliminary results which have been derived from the recently acquired interpretation of seismic wide-angle reflection/refraction data. The data were collected along an almost 500-km long transect carried out in April 2007 using the R/V Sonne in order to determine the upper lithospheric structures of the incoming Pacific Plate and the overriding Australian Plate across the Colville and Kermadec Ridges. This transect lies immediately north of Raoul Island, the largest of the Kermadec Islands and which is presently a highly active volcano. This study is part of the MANGO project (Marine Geoscientific Inverstigations on the Input and Output of the Kermadec Subduction Zone) which comprises a 1000-km long working area north of New Zealand's North Island. It covers the transition from subduction of the Hikurangi Plateau in the south to erosive subduction of normal Pacific oceanic crust in the centre and thence accretionary subduction further north. Overall the subduction is accompanied by northward increasing seismicity. The aim of this project is to understand the transition throughout the different regimes, the variation of the structures to explain the accompanying seismicty, and the role and evolution of the stratovolcanoes. This will be achieved by analysing the structures of the sediment, crust and upper mantle and also material transfers from its input and output through subduction zone processes.

Document Type: Conference or Workshop Item (Poster)
Keywords: Poster
Research affiliation: OceanRep > GEOMAR > FB4 Dynamics of the Ocean Floor > FB4-GDY Marine Geodynamics
Refereed: No
Date Deposited: 03 Dec 2008 16:51
Last Modified: 23 Feb 2017 13:10
URI: http://oceanrep.geomar.de/id/eprint/424

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