Slab morphology beneath northern Sumatra revealed by regional and teleseismic traveltime tomography

An eikonal equation-based tomography method is used to invert the high-quality regional and teleseismic traveltime data recorded by 26 broadband seismic stations in northern Sumatra, following which we obtain the P and S wave velocity structures of the crust and mantle down to a depth of 800 km. The...

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Main Authors: Liu, Shaolin, Iman Suardi, Zheng, Ming, Yang, Dinghui, Huang, Xueyuan, Tong, Ping
Other Authors: Asian School of the Environment
Format: Article
Language:English
Published: 2020
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Online Access:https://hdl.handle.net/10356/143320
https://doi.org/10.21979/N9/EBQHFG
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Institution: Nanyang Technological University
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spelling sg-ntu-dr.10356-1433202023-02-28T19:52:17Z Slab morphology beneath northern Sumatra revealed by regional and teleseismic traveltime tomography Liu, Shaolin Iman Suardi Zheng, Ming Yang, Dinghui Huang, Xueyuan Tong, Ping Asian School of the Environment School of Physical and Mathematical Sciences Earth Observatory of Singapore Science::Mathematics Morphology Northern Sumatra An eikonal equation-based tomography method is used to invert the high-quality regional and teleseismic traveltime data recorded by 26 broadband seismic stations in northern Sumatra, following which we obtain the P and S wave velocity structures of the crust and mantle down to a depth of 800 km. The results of both P and S wave tomography clearly show that the Indo-Australian oceanic plate continuously penetrates downward beneath northern Sumatra and the maximum penetration depth varies approximately from 400 km at the northern tip of Sumatra to about 800 km around the southern boundary of our study area. Significant slab folding or bending reported in the literature as the main feature of the subducted slab beneath northern Sumatra is not found in our results. Instead, our tomographic images demonstrate only a less curved slab that mimics the shape of the Sunda Trench and volcanic arc and generally extends over depths from 120 to 450 km. P wave tomography shows broad and pronounced low-velocity anomalies beneath the island of Sumatra in the lower crust and uppermost mantle. Our model also reveals a slab tear approximately at 120-km depth, which has been documented in previous studies and considered to be related to the eruption of the Toba supervolcano. Ministry of Education (MOE) National Research Foundation (NRF) Published version 2020-08-24T01:42:52Z 2020-08-24T01:42:52Z 2019 Journal Article Liu, S., Iman Suardi, Zheng, M., Yang, D., Huang, X., & Tong, P. (2019). Slab morphology beneath northern Sumatra revealed by regional and teleseismic traveltime tomography. Journal of Geophysical Research: Solid Earth, 124(10), 10544-10564. doi:10.1029/2019jb017625 2169-9313 https://hdl.handle.net/10356/143320 10.1029/2019JB017625 2-s2.0-85074719490 10 124 10544 10564 en Journal of Geophysical Research: Solid Earth https://doi.org/10.21979/N9/EBQHFG © 2019 American Geophysical Union. All rights reserved. This paper was published in Journal of Geophysical Research: Solid Earth and is made available with permission of American Geophysical Union. application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Science::Mathematics
Morphology
Northern Sumatra
spellingShingle Science::Mathematics
Morphology
Northern Sumatra
Liu, Shaolin
Iman Suardi
Zheng, Ming
Yang, Dinghui
Huang, Xueyuan
Tong, Ping
Slab morphology beneath northern Sumatra revealed by regional and teleseismic traveltime tomography
description An eikonal equation-based tomography method is used to invert the high-quality regional and teleseismic traveltime data recorded by 26 broadband seismic stations in northern Sumatra, following which we obtain the P and S wave velocity structures of the crust and mantle down to a depth of 800 km. The results of both P and S wave tomography clearly show that the Indo-Australian oceanic plate continuously penetrates downward beneath northern Sumatra and the maximum penetration depth varies approximately from 400 km at the northern tip of Sumatra to about 800 km around the southern boundary of our study area. Significant slab folding or bending reported in the literature as the main feature of the subducted slab beneath northern Sumatra is not found in our results. Instead, our tomographic images demonstrate only a less curved slab that mimics the shape of the Sunda Trench and volcanic arc and generally extends over depths from 120 to 450 km. P wave tomography shows broad and pronounced low-velocity anomalies beneath the island of Sumatra in the lower crust and uppermost mantle. Our model also reveals a slab tear approximately at 120-km depth, which has been documented in previous studies and considered to be related to the eruption of the Toba supervolcano.
author2 Asian School of the Environment
author_facet Asian School of the Environment
Liu, Shaolin
Iman Suardi
Zheng, Ming
Yang, Dinghui
Huang, Xueyuan
Tong, Ping
format Article
author Liu, Shaolin
Iman Suardi
Zheng, Ming
Yang, Dinghui
Huang, Xueyuan
Tong, Ping
author_sort Liu, Shaolin
title Slab morphology beneath northern Sumatra revealed by regional and teleseismic traveltime tomography
title_short Slab morphology beneath northern Sumatra revealed by regional and teleseismic traveltime tomography
title_full Slab morphology beneath northern Sumatra revealed by regional and teleseismic traveltime tomography
title_fullStr Slab morphology beneath northern Sumatra revealed by regional and teleseismic traveltime tomography
title_full_unstemmed Slab morphology beneath northern Sumatra revealed by regional and teleseismic traveltime tomography
title_sort slab morphology beneath northern sumatra revealed by regional and teleseismic traveltime tomography
publishDate 2020
url https://hdl.handle.net/10356/143320
https://doi.org/10.21979/N9/EBQHFG
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