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Title: Seismic velocity and anisotropy tomography of southern Sumatra
Authors: Liu, Yongsheng
Suardi, Iman
Huang, Xueyuan
Liu, Shaolin
Tong, Ping
Keywords: Science::Geology
Issue Date: 2021
Source: Liu, Y., Suardi, I., Huang, X., Liu, S. & Tong, P. (2021). Seismic velocity and anisotropy tomography of southern Sumatra. Physics of the Earth and Planetary Interiors, 316, 106722-.
Project: 04MNP000559C230
Journal: Physics of the Earth and Planetary Interiors
Abstract: In this study new isotropic P- and S-wave velocity models as well as the P-wave azimuthally anisotropic model of the crust and uppermost mantle beneath southern Sumatra are derived from regional earthquake data by using the eikonal equation-based seismic tomography method. All the tomographic results reveal a clear high-velocity (high-V) belt in the uppermost mantle that represents the subducting Indo-Australian slab. In the mantle wedge, relatively low velocity (low-V) anomalies are clearly imaged, which may be related to the ascending fluids and partial melts caused by slab dehydration. The P-wave azimuthally anisotropic model shows complex patterns in the upper crust, which may be due to the effects of the maximum horizontal compressive stress and/or geological structure. Trench-normal fast velocity directions (FVDs) prevail in the lower crust, which may be associated with the plastic flow induced by the oblique plate convergence. Predominant trench-parallel FVDs in the fore-arc and volcanic-arc mantle wedge and trench-normal FVDs in the back-arc mantle wedge are observable, which are possibly related to 2-D slab-driven corner flow and/or 3-D complex mantle flow. The subducting slab generally displays trench-parallel FVDs, suggesting that the slab may keep the original fossil anisotropy.
ISSN: 0031-9201
DOI: 10.1016/j.pepi.2021.106722
Schools: School of Physical and Mathematical Sciences 
Asian School of the Environment 
Research Centres: Earth Observatory of Singapore 
Rights: © 2021 Elsevier B.V. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
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