Post-Subduction Tectonics of Sabah, Northern Borneo, Inferred From Surface Wave Tomography

Tim Greenfield; Amy Gilligan; Simone Pilia; David G. Cornwell; Felix Tongkul; Sri Widiyantoro; Nicholas Rawlinson

doi:10.1029/2021GL096117

Post-Subduction Tectonics of Sabah, Northern Borneo, Inferred From Surface Wave Tomography

Tim Greenfield^* (Corresponding Author), Amy Gilligan, Simone Pilia, David G. Cornwell, Felix Tongkul, Sri Widiyantoro, Nicholas Rawlinson

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

5 Citations (Scopus)

Abstract

We use two-plane-wave tomography with a dense network of seismic stations across Sabah, northern Borneo, to image the shear wave velocity structure of the crust and upper mantle. Our model is used to estimate crustal thickness and the depth of the lithosphere-asthenosphere boundary (LAB) beneath the region. Calculated crustal thickness ranges between 25 and 55 km and suggests extension in a NW-SE direction, presumably due to back-arc processes associated with subduction of the Celebes Sea. We estimate the ?-factor to be 1.3?2, well below the initiation of seafloor spreading. The LAB is, on average, at a depth of 100 km, which is inconsistent with models that ascribe Neogene uplift to wholescale removal of the mantle lithosphere. Instead, beneath a region of Plio-Pleistocene volcanism in the southeast, we image a region 50?100 km across where the lithosphere has thinned to

Original language	English
Article number	e2021GL096117
Number of pages	12
Journal	Geophysical Research Letters
Volume	49
Issue number	3
Early online date	4 Feb 2022
DOIs	https://doi.org/10.1029/2021GL096117
Publication status	Published - 16 Feb 2022

Keywords

surface wave tomography
Sabah
post-subduction
lithospheric structure
Borneo
LAB

Access to Document

10.1029/2021GL096117Licence: CC BY

Greenfield_etal_GRL_Post_Subduction_Tectonics_VoR
© 2022. The Authors. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. https://creativecommons.org/licenses/by/4.0/
Final published version, 2.71 MBLicence: CC BY

Aberdeen University Geophysical Equipment Repository (AUGER)
David Graham Cornwell (Manager)
Geology and Geophysics
Research Facilities: Facility

Cite this

@article{9cb7dab95ac84356a0f1ee6a921e0fc0,

title = "Post-Subduction Tectonics of Sabah, Northern Borneo, Inferred From Surface Wave Tomography",

abstract = "We use two-plane-wave tomography with a dense network of seismic stations across Sabah, northern Borneo, to image the shear wave velocity structure of the crust and upper mantle. Our model is used to estimate crustal thickness and the depth of the lithosphere-asthenosphere boundary (LAB) beneath the region. Calculated crustal thickness ranges between 25 and 55 km and suggests extension in a NW-SE direction, presumably due to back-arc processes associated with subduction of the Celebes Sea. We estimate the ?-factor to be 1.3?2, well below the initiation of seafloor spreading. The LAB is, on average, at a depth of 100 km, which is inconsistent with models that ascribe Neogene uplift to wholescale removal of the mantle lithosphere. Instead, beneath a region of Plio-Pleistocene volcanism in the southeast, we image a region 50?100 km across where the lithosphere has thinned to ",

keywords = "surface wave tomography, Sabah, post-subduction, lithospheric structure, Borneo, LAB",

author = "Tim Greenfield and Amy Gilligan and Simone Pilia and Cornwell, {David G.} and Felix Tongkul and Sri Widiyantoro and Nicholas Rawlinson",

note = "Acknowledgments We thank all those involved in the deployment of the nBOSS seismic array. BMKG and ITB facilitated the deployment of the Kalimantan array; without them, the stations could not have been deployed. nBOSS seismometers were provided by the University of Cambridge, University of Aberdeen, and SEIS-UK (Loan 1038). Many thanks go to Nick Harmon and Yingje Yang, both of whom provided vital software. Many figures were made using GMT (Wessel et al., 2019). TG is funded by a Leverhulme Early Career Research Fellowship (ECF-049). SP acknowledges support from the Natural Environmental Research Council (NERC) Grant NE/R013500/1 and from the European Union's Horizon 2020 Research and Innovation Program under Marie Sk{\l}odowska-Curie Grant Agreement 790203. Earth Sciences Cambridge publication number ESC-6308.",

year = "2022",

month = feb,

day = "16",

doi = "10.1029/2021GL096117",

language = "English",

volume = "49",

journal = "Geophysical Research Letters",

issn = "0094-8276",

publisher = "AMER GEOPHYSICAL UNION",

number = "3",

}

TY - JOUR

T1 - Post-Subduction Tectonics of Sabah, Northern Borneo, Inferred From Surface Wave Tomography

AU - Greenfield, Tim

AU - Gilligan, Amy

AU - Pilia, Simone

AU - Cornwell, David G.

AU - Tongkul, Felix

AU - Widiyantoro, Sri

AU - Rawlinson, Nicholas

N1 - Acknowledgments We thank all those involved in the deployment of the nBOSS seismic array. BMKG and ITB facilitated the deployment of the Kalimantan array; without them, the stations could not have been deployed. nBOSS seismometers were provided by the University of Cambridge, University of Aberdeen, and SEIS-UK (Loan 1038). Many thanks go to Nick Harmon and Yingje Yang, both of whom provided vital software. Many figures were made using GMT (Wessel et al., 2019). TG is funded by a Leverhulme Early Career Research Fellowship (ECF-049). SP acknowledges support from the Natural Environmental Research Council (NERC) Grant NE/R013500/1 and from the European Union's Horizon 2020 Research and Innovation Program under Marie Skłodowska-Curie Grant Agreement 790203. Earth Sciences Cambridge publication number ESC-6308.

PY - 2022/2/16

Y1 - 2022/2/16

N2 - We use two-plane-wave tomography with a dense network of seismic stations across Sabah, northern Borneo, to image the shear wave velocity structure of the crust and upper mantle. Our model is used to estimate crustal thickness and the depth of the lithosphere-asthenosphere boundary (LAB) beneath the region. Calculated crustal thickness ranges between 25 and 55 km and suggests extension in a NW-SE direction, presumably due to back-arc processes associated with subduction of the Celebes Sea. We estimate the ?-factor to be 1.3?2, well below the initiation of seafloor spreading. The LAB is, on average, at a depth of 100 km, which is inconsistent with models that ascribe Neogene uplift to wholescale removal of the mantle lithosphere. Instead, beneath a region of Plio-Pleistocene volcanism in the southeast, we image a region 50?100 km across where the lithosphere has thinned to

AB - We use two-plane-wave tomography with a dense network of seismic stations across Sabah, northern Borneo, to image the shear wave velocity structure of the crust and upper mantle. Our model is used to estimate crustal thickness and the depth of the lithosphere-asthenosphere boundary (LAB) beneath the region. Calculated crustal thickness ranges between 25 and 55 km and suggests extension in a NW-SE direction, presumably due to back-arc processes associated with subduction of the Celebes Sea. We estimate the ?-factor to be 1.3?2, well below the initiation of seafloor spreading. The LAB is, on average, at a depth of 100 km, which is inconsistent with models that ascribe Neogene uplift to wholescale removal of the mantle lithosphere. Instead, beneath a region of Plio-Pleistocene volcanism in the southeast, we image a region 50?100 km across where the lithosphere has thinned to

KW - surface wave tomography

KW - Sabah

KW - post-subduction

KW - lithospheric structure

KW - Borneo

KW - LAB

U2 - 10.1029/2021GL096117

DO - 10.1029/2021GL096117

M3 - Article

VL - 49

JO - Geophysical Research Letters

JF - Geophysical Research Letters

SN - 0094-8276

IS - 3

M1 - e2021GL096117

ER -

Post-Subduction Tectonics of Sabah, Northern Borneo, Inferred From Surface Wave Tomography

Abstract

Keywords

Access to Document

Fingerprint

Equipment

Aberdeen University Geophysical Equipment Repository (AUGER)

Cite this