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All Journal Journal of Aceh Physics Society Jurnal Fisika FLUX JLBG (Jurnal Lingkungan dan Bencana Geologi) (Journal of Environment and Geological Hazards) Spektra: Jurnal Fisika dan Aplikasinya Dharma Raflesia : Jurnal Ilmiah Pengembangan dan Penerapan IPTEKS
Suhendra Suhendra
Program Studi Geofisika, Jurusan Fisika, FMIPA, Universitas Bengkulu
Aerospace Engineering Agriculture, Biological Sciences & Forestry Humanities Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Environmental Science Materials Science & Nanotechnology Physics Social Sciences Other

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Penentuan Ketebalan Sedimen pada Segmen Kumering, Sesar Sumatra di Daerah Liwa Lampung Barat dengan Menggunakan Metode Seismik Aktif MASW Ashar Muda Lubis; Angga Saputra; Suhendra Suhendra; Rio Saputra; Rida Samdara
Jurnal Lingkungan dan Bencana Geologi Vol 12, No 3 (2021)
Publisher : Badan Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34126/jlbg.v12i3.334

Abstract

ABSTRAK Dampak energi yang dilepas oleh gempa bumi Liwa Mw 7.0 tahun 1994 pada segmen Kumering daerah selatan Sesar Sumatra mengakitbatkan hilangnya nyawa manusia dan kerusakan berat pada infrastuktur. Tingkat kerusakan gempa bumi selain dipengaruhi oleh besarnya magnitudo gempa bumi, juga dikontrol oleh struktur bawah permukaan dan ketebalan sedimen pada daerah itu. Penelitian ini bertujuan untuk mengetahui struktur lapisan bawah permukaan di daerah Liwa melalui pengamatan kecepatan gelombang sekunder (Vs) dan ketebalan sedimen dengan menggunakan metode seismik aktif Multichannel Analysis of Surface Waves (MASW). Survei seismik dengan panjang lintasan total 192 m menggunakan seismograf digital PASI 16S24 dan 24 geophone. Pengolahan data seismik dilakukan dengan menggunakan perangkat lunak seismik komersial ParkSeis. Hasil penelitan menunjukkan bahwa struktur lapisan di daerah Liwa terdiri dari 3 lapisan ketebalan sedimen 15-20 m, nilai Vs sekitar 250-300 m/s dan densitas sekitar 1,7-2,2 gr/cm3 . Lapisan kedua merupakan lapisan transisi antara lapisan sedimen dan lapisan batuan dasar dengan ketebalan rata-rata 5 m dan nilai Vs 600-800 m/s. Selanjutnya lapisan ketiga berada pada kedalaman 25-50 m yang ditandai dengan nilai Vs antara 800-1000 m/s. Lapisan pertama diduga berupa pasir padat menengah/tuff pasiran, dilluvial lunak yang bercampur dengan kerikil dan sisipan lempung yang dipengaruhi oleh keberadaan air bawah tanah dan pergerakan aktif segmen Kumering. Kondisi ini akan memudahkan terjadi amplifikasi atau penguatan terhadap getaran gempa bumi. Oleh karena itu upaya adaptasi dan mitigasi terhadap bencana gempa bumi di daerah Liwa sangat mendesak untuk dilakukan terutama dalam perencanaan.Kata kunci: Gempa bumi, Multichannel Analysis of Surface Waves (MASW), ketebalan sedimen, struktur lapisanABSTRACT The impact of the energy released by the 1994 Liwa Mw earthquake in 1994 in the Kumering region south of Sumatra Fault, were not only human loss, but also severely damaged infrastructures. The level of earthquake damage is influenced by the size of the earthquake and controlled by the subsurface structure and the sediment thickness. This study aims to determine the local subsurface structure in the Liwa area by observing shear wave velocity (Vs) and sediment thickness using the active seismic method of Multichannel Analysis of Surface Waves (MASW). A seismic survey with a total track seismic length of 192 m has been carried out using digital seismographs PASI 16S24 and 24 geophones, and the seismic data were processed by using ParkSeis commercial seismic software. The results show that the local subsurface structure in the Liwa area consists of 3 layers. Estimated sediment thickness is 15-20 m with Vs value of 250-300 m/s and the density of 1.7-2.2 gr/cm3 . The second layer is a transition layer between the sedimentary layer and the hard bedrock with an average thickness of 5 m and a Vs value of 600-800 m / s. Furthermore, the third layer is at a depth of 25-50 m which is characterized by Vs value between 800-1000 m/s. The first layer is assumed to be a medium dense sand, soft dilluvial sand mixed with gravel/ rigid clay which is influenced by the presence of underground water and the active tectonic movement of the Kumering segment. Hence, this condition will facilitate the amplification or strengthening of earthquake vibrations. Therefore, adaptation and mitigation efforts associated with the earthquake disaster prevention in the Liwa area are very urgent to establish for urban planning.Keywords: earthquake, Multichannel Analysis of Surface Waves (MASW), sediment’s thickness, structure layer
Lattice Gas Automata Applications to Estimate Effective Porosity and Permeability Barrier Model of the Triangle with a Height Variation Halauddin Halauddin; Suhendra Suhendra; Muhammad Isa
Journal of Aceh Physics Society Volume 9, Number 2, May 2020
Publisher : PSI-Aceh

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24815/jacps.v9i2.16056

Abstract

Penelitian ini bertujuan untuk menghitung porositas efektif (фeff) dan permeabilitas (k) menggunakan model segitiga dengan variasi tinggi yaitu 3, 4, 5, 6 dan 7 cm. Perhitungan porositas dan permeabilitas yang efektif dilakukan dengan menggunakan model Lattice Gas Automata (LGA), yang diimplementasikan dengan bahasa pemrograman Delphi 7.0. Untuk model segitiga penghalang dengan tinggi 3, 4, 5, 6 dan 7 cm, nilai porositas efektif dan permeabilitas, masing-masing: фeff (T1) = 0,1690, k (T1) = 0 , 001339 pixel2; фeff (T2) = 0,1841, k (T2) = 0,001904 pixel2; фeff (T3) = 0,1885, k (T3) = 0,001904 pixel2; фeff (T4) = 0,1938, k (T4) = 0001925 pixel2; dan фeff (T5) = 0,2053, k (T5) = 0,002400 pixel2. Dari hasil simulasi, diperoleh tinggi segitiga akan berpengaruh signifikan terhadap nilai porositas efektif dan permeabilitas. Pada segitiga lebih tinggi, menyebabkan tabrakan model aliran fluida LGA mengalami lebih banyak hambatan untuk penghalang, sehingga porositas efektif dan permeabilitas menurun. Sebaliknya, jika segitiga lebih rendah, menyebabkan tabrakan model aliran fluida LGA mengalami lebih sedikit hambatan untuk penghalang, sehingga porositas efektif dan permeabilitas meningkat.This  research purposed to calculate the effective porosity (feff) and permeability (k) using the barrier model of the triangle with a high varying are 3, 4, 5, 6 and 7 cm. Effective porosity and permeability calculations performed using the model Lattice Gas Automata (LGA), which is implemented with Delphi 7.0 programming language. For model the barrier triangle with a high of 3, 4, 5, 6 and 7 cm, the value of effective porosity and permeability, respectively: feff(T1)=0,1690, k(T1)=0,001339 pixel2; feff(T2)=0,1841, k(T2)=0,001904 pixel2; feff(T3)=0,1885, k(T3)=0,001904 pixel2; feff(T4)=0,1938, k(T4)= 0001925 pixel2; and feff(T5)=0,2053, k(T5)=0,002400 pixel2. From the simulation results, obtained by the high of the triangle will be a significant effect on the value of effective porosity and permeability. If the triangle highest, causing the collision of fluid flow models LGA experience more obstacles to the barrier, so that the effective porosity and permeability decrease. Conversely, if the triangle lower, causing the collision of fluid flow models LGA experience less obstacles to the barrier, so that the effective porosity and permeability increases.Keywords: Effective porosity, permeability, model triangle, model LGA 
Pendugaan Struktur Bawah Permukaan Daerah Prospek Panas Bumi Gunungapi Hulu Lais Lereng Utara dengan Menggunakan Metode Magnetik Arif Ismul Hadi; Refrizon Refrizon; Suhendra Suhendra
Jurnal Fisika FLUX Vol 7, No 1 (2010): Jurnal Fisika Flux Edisi Februari 2010
Publisher : Lambung Mangkurat University Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (206.442 KB) | DOI: 10.20527/flux.v7i1.3072

Abstract

Penelitian ini bertujuan menduga struktur bawah permukaan daerahprospek panas bumi Gunungapi Hulu Lais lereng utara dengan menggunakanmetode magnetik. Pengambilan data dilakukan dengan menggunakan peralatanProton Procession Magnetometer (PPM) model G-856. Data diolah berdasarkanpemodelan ke depan (forward modelling) dengan Software Mag2DC forwindows. Berdasarkan model 2-D penampang lintang geomagnetik strukturbawah permukaan, daerah prospek panas bumi Gunungapi Hulu Lais lerengutara tersusun oleh batuan basalt, andesit, dan endapan piroklastik. Mata airpanas yang nampak di permukaan merupakan rembesan yang berasal darisumber air panas utama Gunungapi Hulu Lais yang melewati bidang batasantara batuan basalt dan batuan andesit serta endapan piroklastik yangmenyebabkan zona ini menjadi lemah dan menyebabkan munculnya mata airpanas di permukaan.
KONDISI GEOLOGI LOKAL KOTA BENGKULU BERDASARKAN GROUND SHEAR STRAIN (GSS) Nanang Sugianto; M. Farid; Suhendra Suhendra
Spektra: Jurnal Fisika dan Aplikasinya Vol 2 No 1 (2017): SPEKTRA: Jurnal Fisika dan Aplikasinya, Volume 2 Nomor 1, April 2017
Publisher : Program Studi Fisika Universitas Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (583.615 KB) | DOI: 10.21009/SPEKTRA.021.05

Abstract

Abstrak Kondisi geologi lokal merupakan salah satu parameter yang mempengaruhi tingkat kerusakan akibat gempabumi. Kondisi geologi kota Bengkulu telah digambarkan oleh nilai Ground Shear Strain (GSS) yang diperoleh dari hasil analisis enam puluh tujuh data mikrotremor yang dipasang di setiap jenis formasi geologi. Berdasarkan hasil analisis, nilai GSS kota Bengkulu relatif heterogen meskipun pada jenis formasi geologi yang sama. GSS kota Bengkulu diperoleh dan dibagi dalam tiga kelompok, diantarany 10-6 (25.37%), 10-5 (40.30%) dan 10-4 (32.84%). Variasi ini mengindikasikan adanya perbedaan ketebalan lapisan sedimen dan tingkat kekerasan batuan untuk setiap titik amat. Wilayah yang memiliki nilai GSS tinggi memiliki kesesuaian dengan kondisi lapangan yang sebenarya (berdasarkan hasil ground survey merupakan daerah bekas rawa dengan mofologi landai) dan kesesuaian dengan sejarah kerusakan akibat gempabumi besar di kota Bengkulu. Berdasarkan peta sebaran nilai GSS, potensi deformasi paling tinggi terindentfikasi di bagian barat Kota Bengkulu yaitu wilayah dengan formasi geologi undak alluvium, alluvium dan sebagian formasi andesit, sedangkan formasi geologi lainya relatif lebih aman. Dinamika lapisan tanah permukaan kota Bengkulu umumnya bersifat elastis dan berpotensi mengalami rekahan dansettlement. Struktur geologi yang relatif lunak dan lapisan sedimen yang tipis memungkinkan terjadinya penguatan efek gelombang dan resonansi tinggi ketika gempabumi terjadi. Kata-kata kunci: Kondisi geologi lokal kota Bengkulu, Ground Shear Strain, deformasi. Abstract Local geology condition has become one of the most parameters which affected damage level of earthquake. Geology condition of Bengkulu city has been described by Ground Shear Strain (GSS) value that obtained by sixty seven microtremor data analysis result what instaled on each geology formation types. According analysis result, GSS value of Bengkulu city was heterogeneous relatively in spite of similar geology formation type. GSS in Bengkulu City has obtained and be divided to three category, including 10-6 (25.37%), 10-5 (40.30%) and 10-4 (32.84%). These variations indicate differences in the thickness of sediment layer and rock solidity level of sites. The Areas of high value of GSS have compatibility with actual field conditions (Based on ground survey, it was swamp area and morphology ramps relatively) and have compatibility with damaged earthquake effect history of Bengkulu city. According map of GSS value distributions, high potency of deformation was indicated in western of Bengkulu city area, it was alluvium terraces formation, alluvium formation and partial of andesite formation, while others were relatively safer. The dynamic characteristic of surface soil layer on Bengkulu city was elastic and potential crack and settlement.The soft geology structure relatively and thin of sediments layer would affected amplification of wave and high resonance when earthquake occur. Keywords: Local geology condition of Bengkulu city, ground shear strain, deformation of soil
PERANCANGAN DAN PEMANFAATAN TEKNOLOGI HIDROPONIK VERTIKAL HIDRO 40 HOLE BAGI KARANG TARUNA TRI TUNGGAL DI DESA TALANG PAUH Halauddin Halauddin; Supiyati Supiyati; Suhendra Suhendra
DHARMA RAFLESIA Vol 16, No 1 (2018): JUNI (ACCREDITED SINTA 5)
Publisher : Universitas Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/dr.v16i1.4825

Abstract

It has been devoted an activity in community in application of science and technology with the title: Design and Utilization Hydroponic Vertical Hydro 40 Hole for Karang Taruna Tri Tunggal in Talang Pauh Village, Pondok Kelapa District, Central Bengkulu. This dedication destination to design and utilize hydroponic vertical hydro technology as one of the ground breaking technological break throughs in rural areas to complement the vegetable needs for house hold scale. From the results of the implementation of dedication can be concluded that hydroponic technology vertical model of 40 holes hydro can be well received by the participant’s devotion. The plant species are mustard, this plant can grow well from two weeks old, although the harvest period for mustard plants is estimated to 35-50 days. Keywords: hydroponic, vertical hydro, 40 hole, house hold scale, Talang Pauh Village 
PENERAPAN POMPA HIDRAM METODE PARALEL UNTUK MENGATASI PERMASALAHAN AIR Irkhos Irkhos; Suhendra Suhendra; Sukisno Sukisno
DHARMA RAFLESIA Vol 13, No 2 (2015): DESEMBER
Publisher : Universitas Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/dr.v13i2.4245

Abstract

The program is implemented in Pungguk Beringin Merigi Kelindang Bengkulu Tengah. The purpose of this program is to provide the knowledge and skills of rural communities in Pungguk Beringin on utilization Hydraulic ram. Participants were representatives of community activities. The solution provided is the application of Parallel Methods Hydraulic ram. Through these program, installation Hydraulic ram diameter of 2 inches can be generated about 10 liters of effluent water in each minute with to a height of 50 meters and250 meters from water source. Some factors that can affect to this achievement are water capacity, topography, and people participation. Keywords: Hydraulic ram pump, Parallel Methods, Pungguk Beringin   
Co-Authors Angga Saputra Arif Ismul Hadi Ashar Muda Lubis Halauddin Halauddin Halauddin Halauddin Irkhos Irkhos Muchammad Farid Muhammad Isa Nanang Sugianto Refrizon Refrizon Rida Samdara Rio Saputra Sukisno Sukisno Supiyati .