Evolution of Subduction Cusps From the Perspective of Trench Migration and Slab Morphology

The geometries of trenches vary worldwide due to continuous plate boundary reorganization. When two trenches intersect to generate a corner, a subduction cusp is formed. Although subduction cusps are frequently observed throughout historical plate movement reconstructions, few studies have been cond...

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Autores principales:	Hui Zhao, Xiaobing Shen, Wei Leng
Formato:	article
Lenguaje:	EN
Publicado:	Frontiers Media S.A. 2021
Materias:	subduction cusp trench migration slab morphology oceanic subduction numerical simulation Science Q
Acceso en línea:	https://doaj.org/article/d3cfc0da21d84bf0a6c7a75d89f2694f
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spelling	oai:doaj.org-article:d3cfc0da21d84bf0a6c7a75d89f2694f2021-11-17T07:01:59ZEvolution of Subduction Cusps From the Perspective of Trench Migration and Slab Morphology2296-646310.3389/feart.2021.783409https://doaj.org/article/d3cfc0da21d84bf0a6c7a75d89f2694f2021-11-01T00:00:00Zhttps://www.frontiersin.org/articles/10.3389/feart.2021.783409/fullhttps://doaj.org/toc/2296-6463The geometries of trenches vary worldwide due to continuous plate boundary reorganization. When two trenches intersect to generate a corner, a subduction cusp is formed. Although subduction cusps are frequently observed throughout historical plate movement reconstructions, few studies have been conducted to explore the controlling factors of trench migration and slab morphology along subduction cusps. Here, we use a 3-D dynamic subduction model to explore the influence of the overriding plate strength, initial slab-pull force, and initial cusp angle on the evolution of subduction cusps. Our numerical model results suggest the following: 1) subduction cusps have a tendency to become smooth and disappear during the subduction process; 2) the slab dip angle is smallest in the diagonal direction of the subduction cusp, and a larger cuspate corner angle leads to a larger slab dip angle; 3) the asymmetric distribution of the overriding plate strength and initial slab-pull force determine the asymmetric evolutionary pathway of subduction cusps. Our results provide new insights for reconstructing the evolution of subduction cusps from seismological and geological observations.Hui ZhaoHui ZhaoXiaobing ShenXiaobing ShenWei LengWei LengFrontiers Media S.A.articlesubduction cusptrench migrationslab morphologyoceanic subductionnumerical simulationScienceQENFrontiers in Earth Science, Vol 9 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	subduction cusp trench migration slab morphology oceanic subduction numerical simulation Science Q
spellingShingle	subduction cusp trench migration slab morphology oceanic subduction numerical simulation Science Q Hui Zhao Hui Zhao Xiaobing Shen Xiaobing Shen Wei Leng Wei Leng Evolution of Subduction Cusps From the Perspective of Trench Migration and Slab Morphology
description	The geometries of trenches vary worldwide due to continuous plate boundary reorganization. When two trenches intersect to generate a corner, a subduction cusp is formed. Although subduction cusps are frequently observed throughout historical plate movement reconstructions, few studies have been conducted to explore the controlling factors of trench migration and slab morphology along subduction cusps. Here, we use a 3-D dynamic subduction model to explore the influence of the overriding plate strength, initial slab-pull force, and initial cusp angle on the evolution of subduction cusps. Our numerical model results suggest the following: 1) subduction cusps have a tendency to become smooth and disappear during the subduction process; 2) the slab dip angle is smallest in the diagonal direction of the subduction cusp, and a larger cuspate corner angle leads to a larger slab dip angle; 3) the asymmetric distribution of the overriding plate strength and initial slab-pull force determine the asymmetric evolutionary pathway of subduction cusps. Our results provide new insights for reconstructing the evolution of subduction cusps from seismological and geological observations.
format	article
author	Hui Zhao Hui Zhao Xiaobing Shen Xiaobing Shen Wei Leng Wei Leng
author_facet	Hui Zhao Hui Zhao Xiaobing Shen Xiaobing Shen Wei Leng Wei Leng
author_sort	Hui Zhao
title	Evolution of Subduction Cusps From the Perspective of Trench Migration and Slab Morphology
title_short	Evolution of Subduction Cusps From the Perspective of Trench Migration and Slab Morphology
title_full	Evolution of Subduction Cusps From the Perspective of Trench Migration and Slab Morphology
title_fullStr	Evolution of Subduction Cusps From the Perspective of Trench Migration and Slab Morphology
title_full_unstemmed	Evolution of Subduction Cusps From the Perspective of Trench Migration and Slab Morphology
title_sort	evolution of subduction cusps from the perspective of trench migration and slab morphology
publisher	Frontiers Media S.A.
publishDate	2021
url	https://doaj.org/article/d3cfc0da21d84bf0a6c7a75d89f2694f
work_keys_str_mv	AT huizhao evolutionofsubductioncuspsfromtheperspectiveoftrenchmigrationandslabmorphology AT huizhao evolutionofsubductioncuspsfromtheperspectiveoftrenchmigrationandslabmorphology AT xiaobingshen evolutionofsubductioncuspsfromtheperspectiveoftrenchmigrationandslabmorphology AT xiaobingshen evolutionofsubductioncuspsfromtheperspectiveoftrenchmigrationandslabmorphology AT weileng evolutionofsubductioncuspsfromtheperspectiveoftrenchmigrationandslabmorphology AT weileng evolutionofsubductioncuspsfromtheperspectiveoftrenchmigrationandslabmorphology
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Evolution of Subduction Cusps From the Perspective of Trench Migration and Slab Morphology

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