Artigo Revisado por pares

When slabs collide: A tectonic assessment of deep earthquakes in the Tonga-Vanuatu region

2011; Geological Society of America; Volume: 39; Issue: 8 Linguagem: Inglês

10.1130/g31937.1

ISSN

1943-2682

Autores

Simon Richards, Robert J. Holm, Grace Barber,

Tópico(s)

Geological and Geochemical Analysis

Resumo

Research Article| August 01, 2011 When slabs collide: A tectonic assessment of deep earthquakes in the Tonga-Vanuatu region Simon Richards; Simon Richards * School of Earth and Environmental Sciences, James Cook University, Townsville, Queensland 4811, Australia *E-mail: simon.richards@jcu.edu.au. Search for other works by this author on: GSW Google Scholar Robert Holm; Robert Holm School of Earth and Environmental Sciences, James Cook University, Townsville, Queensland 4811, Australia Search for other works by this author on: GSW Google Scholar Grace Barber Grace Barber School of Earth and Environmental Sciences, James Cook University, Townsville, Queensland 4811, Australia Search for other works by this author on: GSW Google Scholar Geology (2011) 39 (8): 787–790. https://doi.org/10.1130/G31937.1 Article history received: 09 Mar 2011 rev-recd: 16 Mar 2011 accepted: 28 Mar 2011 first online: 09 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Simon Richards, Robert Holm, Grace Barber; When slabs collide: A tectonic assessment of deep earthquakes in the Tonga-Vanuatu region. Geology 2011;; 39 (8): 787–790. doi: https://doi.org/10.1130/G31937.1 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract An unusual group of more than 100 earthquakes is located ∼600 km beneath the North Fiji Basin in the southwest Pacific Ocean. These earthquakes are attributed to seismicity within detached segments of the subducted Australian plate. One of these detached slab segments has collided with, and now impinges on, the subducted Pacific plate at a depth of ∼500 km. The region in the mantle where the two slab segments meet is also characterized by an unparalleled abundance of large-magnitude (Mw >7.0) earthquakes for this depth. The folded shape of the Pacific slab beneath Fiji, as well as the abundance of earthquakes, is interpreted to result from deformation and deformation-enhanced phase transformations as the two slabs collide and settle on the 660 km discontinuity. Detachment of the slab segments is interpreted to have occurred at ca. 5 Ma, but collision between the eastern segment and the west-dipping Pacific slab is interpreted to have occurred at ca. 4 Ma, coincident with initial opening of the overriding Lau Basin. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.

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