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Research paper | Open Access

Strain accumulation in the Mentawai Forearc Sliver, Indonesia, inferred from continuous GNSS-derived strain rate

Leni Sophia Heliania, Cecep Pratamaa( ), Adi Wibowob, David Prambudi Saharac, Susilo Susilod, Sidik Tri Wibowoe, Ayu Nur Safiie, Oktadi Prayogae, Ajat Sudrajatf, Mizan Bustanul Fuady Bisrig, Evi Dwi Kurniasarih, Sheilla Evelindah, Nicholas Genta Setiawan Gunawanh
Department of Geodetic Engineering, Universitas Gadjah Mada, Yogyakarta, Indonesia
Department of Computer Science, Universitas Diponegoro, Semarang, Indonesia
Global Geophysics Research Group, Institut Teknologi Bandung, Bandung, Indonesia
Research Center for Geological Disaster, National Research and Innovation Agency, Bandung, Indonesia
Geospatial Information Agency, Cibinong, Indonesia
Meteorological, Climatological, and Geophysical Agency, Jakarta, Indonesia
Graduate School of International Cooperation Studies, Kobe University, Japan
Graduate School of Geodetic Engineering, Universitas Gadjah Mada, Yogyakarta, Indonesia
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Abstract

The Mentawai Forearc Sliver (MFS) is characterized by oblique deformation formed as slip partitioned between normal and parallel trench plate convergence. The surge of great earthquakes from 2004 to 2012 along the adjacent Sunda trench left a large unbroken segment known as the Mentawai Seismic Gap. Here, we adopted continuous Global Navigation Satellite System (GNSS) observation data to identify the present regional crustal deformation using geodetic strain rates. The principal strain rate, dilatation rate, and maximum shear strain rate are about 0.13 microstrain/yr, 0.2 microstrain/yr, and 0.1 microstrain/yr, respectively, with the range of its uncertainties between 0.01 and 0.04 microstrain/yr. The dilatation and maximum shear strain rates reveal the spatial coverage of strike-slip duplex and backthrust tectonics along the Mentawai Forearc Sliver.

Keywords

MentawaiForearcDilatationShearGeodetic

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Geodesy and Geodynamics
Volume 16 Issue 1,
January 2025
Pages 1-6
DOI: 10.1016/j.geog.2024.04.003

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Cite this article:
Heliani LS, Pratama C, Wibowo A, et al. Strain accumulation in the Mentawai Forearc Sliver, Indonesia, inferred from continuous GNSS-derived strain rate. Geodesy and Geodynamics, 2025, 16(1): 1-6. https://doi.org/10.1016/j.geog.2024.04.003

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Received: 29 December 2023
Revised: 19 March 2024
Accepted: 09 April 2024
Published: 07 May 2024
© 2024 Editorial office of Geodesy and Geodynamics.

This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).