IDENTIFYING SHALLOW SUBSURFACE CHARACTERISTICS VIA COMPRESSIONAL TO SHEAR WAVES VELOCITY RATIO (VP/VS) FROM SEISMIC REFRACTION TOMOGRAPHY

Authors

  • Muhammad Syukri Geophysics Section, Department of Physics, Faculty of Sciences, Syiah Kuala University, Banda Aceh (Indonesia) http://orcid.org/0000-0003-0122-456X
  • Nordiana M. Muztaza School of Physics, Universiti Sains Malaysia, 11800 Pulau Pinang, Malaysia https://orcid.org/0000-0002-7067-5607
  • Nur Azwin Ismail School of Physics, Universiti Sains Malaysia, 11800 Pulau Pinang, Malaysia
  • Zul Fadhli Department of Geophysics Engineering, Faculty of Engineering, Syiah Kuala University, Banda Aceh, Indonesia
  • Rosli Saad School of Physics, Universiti Sains Malaysia, 11800 Pulau Pinang, Malaysia

DOI:

https://doi.org/10.11113/jurnalteknologi.v83.14990

Keywords:

Seismic refraction, velocity, ratio, tomography, coefficient of determination

Abstract

This study was conducted in Banda Aceh district by utilizing seismic refraction P- and S-waves methods on three similar profile lines, with the aim to identify subsurface characteristic. The seismic data were acquired using ABEM TERRALOC MK8 system with 28 Hz vertical and 6 Hz horizontal geophones, and suitable seismic sources. Software used for processing to produce 2-D tomography sections and interpretations are IXRefract, Microsoft Excel, SeisOpt@2D v6.0 and Surfer 8. The results show the study area comprises of four subsurface layers with strong to very strong relation between Vp and Vs (R2 is >0.7509) for each layer. Ratio value of Vp and Vs (Vp/Vs) for each layer (1st to 4th) was calculated to be 4.75 – 5.79; 6.50 – 8.89; 6.57 – 12.17 and 6.08 – 8.21 respectively. This study concluded that the ground subsurface in Banda Aceh district is made up of water saturated unconsolidated sediments that was identified to be a mixture of clay and silt at depth up to 55 m.

Author Biographies

Muhammad Syukri, Geophysics Section, Department of Physics, Faculty of Sciences, Syiah Kuala University, Banda Aceh (Indonesia)

Physics Department, Faculty of Sciences Syiah Kuala University

Nordiana M. Muztaza, School of Physics, Universiti Sains Malaysia, 11800 Pulau Pinang, Malaysia

School of Physics, Universiti Sains Malaysia, 11800 Pulau Pinang, Malaysia.

Nur Azwin Ismail, School of Physics, Universiti Sains Malaysia, 11800 Pulau Pinang, Malaysia

School of Physics, Universiti Sains Malaysia, 11800 Pulau Pinang, Malaysia.

Zul Fadhli, Department of Geophysics Engineering, Faculty of Engineering, Syiah Kuala University, Banda Aceh, Indonesia

Department of Geophysics Engineering, Faculty of Engineering, Syiah Kuala University, Banda Aceh, Indonesia.

Rosli Saad, School of Physics, Universiti Sains Malaysia, 11800 Pulau Pinang, Malaysia

School of Physics, Universiti Sains Malaysia, 11800 Pulau Pinang, Malaysia.

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Published

2020-12-07

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Science and Engineering