Salsabilah, Auliah (2026) Prediksi Kecepatan Gelombang Geser (Vs) Menggunakan Multichannel Analysis of Surface Waves (MASW) di Wringinanom, Kabupaten Gresik, Jawa Timur. Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Wringinanom, Kabupaten Gresik, Jawa Timur dipilih sebagai lokasi penelitian ini yang mengkaji prediksi kecepatan gelombang geser (Vs) menggunakan metode Multichannel Analysis of Surface Waves (MASW) dengan pendekatan multiazimuth. Wilayah ini termasuk ke dalam Zona Kendeng dengan karakteristik geologi kompleks berupa sesar, lipatan, dan fenomena gunung lumpur aktif sehingga informasi kecepatan gelombang geser sangat diperlukan untuk keperluan perencanaan teknik dan mitigasi bencana. Akuisisi data dilakukan menggunakan 24 geophone vertikal dengan spasi 2 m dan offset sumber 2 m pada empat lintasan dengan arah azimuth berbeda yaitu 0 hingga 180 derajat, 45 hingga 225 derajat, 90 hingga 270 derajat, dan 135 hingga 315 derajat. Setiap lintasan diolah melalui preprocessing bandpass filtering dan muting, transformasi domain frekuensi kecepatan menggunakan metode phase-shift, serta picking kurva dispersi mode fundamental. Kurva dispersi dari keempat lintasan kemudian digabungkan menjadi kurva dispersi komposit menggunakan prosedur logarithmically spaced wavelength bins, kemudian diinversikan menggunakan metode Monte Carlo stokastik untuk menghasilkan profil Vs 1D. Hasil inversi menunjukkan profil Vs yang meningkat monoton dari lapisan dangkal hingga kedalaman investigasi efektif sekitar 15 m dengan nilai dispersion misfit terbaik sebesar 1,89%. Nilai Vs30 yang diperoleh menempatkan lokasi penelitian dalam klasifikasi kelas situs SD (Medium Soil) berdasarkan SNI 1726:2019, sesuai dengan karakteristik Formasi Lidah yang mendominasi lokasi penelitian.
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Wringinanom, Gresik Regency, East Java was selected as the study area of this research, which examines the prediction of shear wave velocity (Vs) using the Multichannel Analysis of Surface Waves (MASW) method with a multiazimuth approach. This area belongs to the Kendeng Zone with complex geological characteristics comprising faults, folds, and active mud volcano phenomena, making shear wave velocity information essential for engineering planning and disaster mitigation purposes. Data acquisition was carried out using 24 vertical geophones with 2 m receiver spacing and 2 m source offset along four measurement lines with different azimuth directions of 0 to 180 degrees, 45 to 225 degrees, 90 to 270 degrees, and 135 to 315 degrees. Each line was processed through preprocessing stages consisting of bandpass filtering and muting, frequency-velocity domain transformation using the phase-shift method, and fundamental mode dispersion curve picking. Dispersion curves from the four lines were subsequently combined into a composite dispersion curve using the logarithmically spaced wavelength bins procedure, then inverted using stochastic Monte Carlo inversion to produce a 1D Vs profile. Inversion results show a monotonically increasing Vs profile from the shallow layers to an effective investigation depth of approximately 15 m, with a best dispersion misfit value of 1.89%. The obtained Vs30 value classifies the study site as SD (Medium Soil) according to SNI 1726:2019, consistent with the characteristics of the Lidah Formation dominating the study area.
| Item Type: | Thesis (Other) |
|---|---|
| Uncontrolled Keywords: | MASW, Vs30, Weight-Drop, Wringinanom |
| Subjects: | Q Science > QE Geology > QE538.5 Seismic tomography; Seismic waves. Elastic waves Q Science > QE Geology > QE539.2 Seismic traveltime inversion Q Science > QE Geology > QE539.2.S4 Seismic models |
| Divisions: | Faculty of Civil Engineering and Planning > Geophysics Engineering > 33201-(S1) Undergraduate Thesis |
| Depositing User: | Auliah Salsabilah |
| Date Deposited: | 24 Jul 2026 07:28 |
| Last Modified: | 24 Jul 2026 07:28 |
| URI: | http://repository.its.ac.id/id/eprint/137217 |
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