Site Characterization Based on Shear-Wave Velocity Using Multichannel Analysis of Surface Waves (MASW) Method in Urban Areas of Aceh Besar, Indonesia

Dian Darisma; Rifa Salma Salsabila; Amir Asyqari; Haris Hartsa Naufal; Amsir; Asrillah; Zakia Masrurah; Tarmizi; Intan Marlinawati; Kasih D Manalu; Akmal Muhni; Nurul Azmi

Authors

Dian Darisma Department of Geophysical Engineering, Faculty of Engineering, University of Syiah Kuala, Aceh, Indonesia
Rifa Salma Salsabila Department of Geophysical Engineering, Faculty of Engineering, University of Syiah Kuala, Aceh, Indonesia
Amir Asyqari Department of Physics, Faculty of Mathematics and Natural Science, University of Syiah Kuala, Aceh, Indonesia
Haris Hartsa Naufal Department of Geophysical Engineering, Faculty of Science and Technology, University of Jambi, Jambi, Indonesia
Amsir Department of Geophysical Engineering, Faculty of Engineering, University of Syiah Kuala, Aceh, Indonesia
Asrillah Department of Geophysical Engineering, Faculty of Engineering, University of Syiah Kuala, Aceh, Indonesia
Zakia Masrurah Department of Geophysical Engineering, Faculty of Engineering, University of Syiah Kuala, Aceh, Indonesia
Tarmizi Department of Geophysical Engineering, Faculty of Engineering, University of Syiah Kuala, Aceh, Indonesia
Intan Marlinawati Department of Geophysical Engineering, Faculty of Engineering, University of Syiah Kuala, Aceh, Indonesia
Kasih D Manalu Department of Geophysical Engineering, Faculty of Science and Technology, University of Jambi, Jambi, Indonesia
Akmal Muhni Department of Geological Engineering, Faculty of Engineering, University of Syiah Kuala, Aceh, Indonesia
Nurul Azmi Department of Physics Education, Faculty of Teacher Training and Education, University of Abulyatama, Aceh, Indonesia

Keywords:

MASW, surface wave, Shear Wave Velocites, Site Characterization, Aceh Besar

Abstract

Seismic site characterization is needed for earthquake risk mitigation and also for geotechnical infrastructure design. Multichannel Analysis of Surface Waves (MASW) can be used for seismic site characterization. The method extracts shear-wave velocity (Vs) profiles from surface wave analysis that reveal geotechnical conditions and subsurface structures. This study aims to characterize the subsurface layers using the MASW method in Aceh Besar. Data acquisition was carried out along three measurement profiles, each 69 meters long and with a receiver spacing of 3 meters. Shear-wave velocities (Vs) of the subsurface soil and rock layers were estimated using dispersion curve analysis and 1D inversion. The surface wave spectral analysis produced a high-quality dispersion at the fundamental mode frequency of 20–30 Hz. The inversion process, validated by an excellent misfit curve, yields a seven-layer Vs model with RMS values mostly below 0.01. The 2D pseudo-section models based on 1D inversion results show a subsurface stratification consisting of a soft to medium overburden (Vs < 350 m/s) layer of 15 meters thick, followed by a transition zone of dense soil, and engineering bedrock (Vs > 750 m/s) found at a depth of 30 to 40 meters. In general, lateral variations were identified as undulating bedrock topography and local basin structures. Based on SNI 1726:2019, the site is classified as Medium Soil (SD) to Very Dense Soil (SC), with an estimated Vs value influenced by the thickness of the surface sediment. These results provide a valuable overview of subsurface conditions from site characterization and can serve as a basis for geotechnical planning in the study area.

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