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All Journal MEDIA KOMUNIKASI TEKNIK SIPIL Jurnal Pensil : Pendidikan Teknik Sipil
Fahrezi, Zhehan
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Civil Engineering, Building, Construction & Architecture Education Other

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PREDIKSI DAMPA MEGATHRUST TERHADAP RESPONS SEISMIK DI KECAMATAN SELEBAR KOTA BENGKULU Fahrezi, Zhehan; Misliniyati, Rena; Amri, Khairul; Mase, Lindung Zalbuin; Hardiansyah
Jurnal Pensil : Pendidikan Teknik Sipil Vol. 14 No. 1 (2025): Jurnal Pensil : Pendidikan Teknik Sipil
Publisher : LPPM Universitas Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21009/jpensil.v14i1.50133

Abstract

Bengkulu City was hit by major earthquakes in 2000 and 2007 with magnitudes of 7.9 Mw and 8.6 Mw. In 2022 BMKG Baai Island, Bengkulu City, said that there is a potential for an earthquake with a maximum magnitude of 8.9. This study was conducted to determine the response of soil layers due to megathrust earthquake wave propagation in Selebar district, Bengkulu City. The study began with field investigations at six points. The seismic response analysis was built based on a one-dimensional wave propagation model with non-linearity. The 2007 Bengkulu-Mentawai earthquake wave with a magnitude of 8.8 Mw was applied as the input wave. PGA, acceleration response spectra, and amplification factors are presented in this study. The resulting PGA ranged from 0.328g - 0.453g. Five points experienced amplification with amplification factors of 1.093 - 1.317. The spectral acceleration has generally exceeded the applicable design spectral acceleration at a period of 0.2 seconds. The spectral accelerations have generally exceeded the applicable seismic design at short periods, with maximum values of 1.27g - 1.64g. So it is necessary to update the seismic design for building planning in Selebar District, Bengkulu City.
Model Respons Seismik Tanah di Kecamatan Selebar Akibat Perambatan Gelombang Gempa Satu Dimensi Fahrezi, Zhehan; Misliniyati, Rena; Amri, Khairul; Mase, Lindung Zalbuin; Hardiansyah, Hardiansyah
MEDIA KOMUNIKASI TEKNIK SIPIL Volume 30, Nomor 2, DESEMBER 2024
Publisher : Department of Civil Engineering, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/mkts.v30i2.64462

Abstract

Penelitian ini dilakukan untuk mengetahui respons lapisan tanah akibat perambatan gelombang gempa di Kecamatan Selebar Kota Bengkulu. Studi ini diawali dengan investigasi di lapangan pada enam titik. Analisis respons seismik dibangun berdasarkan model perambatan gelombang satu dimensi dengan metode ekivalen linier dan non-linier. Gelombang gempa terskala Bengkulu-Mentawai tahun 2007 diterapkan sebagai gelombang input. Perbandingan PGA, percepatan respon spektra, dan faktor amplifikasi yang dihasilkan dari kedua metode disajikan dalam penelitian ini. Nilai PGA yang dihasilkan dengan metode ekivalen linier lebih besar sekitar 5% - 30% dari metode non-linier. Faktor amplifikasi yang dihasilkan dengan metode ekivalen linier mengalami penguatan lebih besar sekitar 3% - 30% dari metode non-linier. Percepatan spektra secara umum telah melewati desain seismik yang berlaku pada pada periode pendek, dengan nilai sebesar 1,2g – 2,1g untuk metode ekivalen linier dan 1,1g – 1,6g untuk metode non-linier. Maka perlu adanya pembaharuan desain seismik untuk perencanaan bangunan gedung di Kecamatan Selebar Kota Bengkulu.
Co-Authors Hardiansyah Hardiansyah Hardiansyah Khairul Amri Lindung Zalbuin Mase, Lindung Zalbuin Misliniyati, Rena