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All Journal MEDIA KOMUNIKASI TEKNIK SIPIL The International Journal of Remote Sensing and Earth Sciences (IJReSES)
Lindung Zalbuin Mase
Department of Civil Engineering, Faculty of Engineering, University of Bengkulu
Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences

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ASSESSMENT OF GROUND SURFACE DEFORMATION IN BENGKULU CITY INDUCED BY EARTHQUAKES USING DINSAR-BASED REMOTE SENSING IMAGE ANALYSIS Ferzha Putra Utama; Arie Vatresia; Lindung Zalbuin Mase; Ahmad Faris
International Journal of Remote Sensing and Earth Sciences Vol. 21 No. 2 (2024)
Publisher : BRIN

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30536/ijreses.v21i2.8915

Abstract

In 2007, Bengkulu city, Indonesia and its surrounding areas experienced a significant earthquake with a magnitude of 8.6 Mw, resulting in extensive damage. Between 2014 and 2022, Bengkulu Province encountered a total of 3469 earthquakes, signifying a heightened frequency of seismic activity in the region. This escalated seismic activity in Bengkulu elicits concerns regarding potential ground surface deformation. To address this, the study utilized DInSAR (Differential Interferometry SAR) technology, employing a blend of satellite images to quantify land surface deformation. Notably, the research made use of three pairs of satellite images for analysis. One pair of ALOS-PALSAR images dated between January 29 and September 16, 2007, was employed to investigate ground surface deformation following the September 12, 2007 earthquake. Additionally, observations were made using two pairs of Sentinel-1 satellite images covering periods from November 3 to 27, 2014, and from June 30 to July 24, 2022, to monitor land surface deformation resulting from earthquakes on November 10, 2014 and July 20, 2022. The study findings depicted uplift deformation reaching 53.4 mm and the highest subsidence measuring -12.8 mm in the ALOS-PALSAR image pair. In the Sentinel-1 image pair between November 3 and 27, 2014, the most notable observed uplift amounted to 38.9 mm, while the greatest subsidence was recorded at -34.8 mm. Lastly, the image pair dated between June 30 and July 24, 2022, exclusively exhibited uplift, with values peaking at 45.2 mm.
Model Respons Seismik Tanah di Kecamatan Selebar Akibat Perambatan Gelombang Gempa Satu Dimensi Zhehan Fahrezi; Rena Misliniyati; Khairul Amri; Lindung Zalbuin Mase; Hardiansyah Hardiansyah
MEDIA KOMUNIKASI TEKNIK SIPIL Volume 30, Nomor 2 (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 Ahmad Faris Arie Vatresia Hardiansyah Hardiansyah Khairul Amri Rena Misliniyati Utama, Ferzha Putra Zhehan Fahrezi