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ANALYSIS OF SHALLOW SUBSURFACE STRUCTURE AT GEOTHERMAL AREA OF IE JUE USING RESISTIVITY METHOD Syafrizal Idris; Muhammad Syukri; Muhammad Syukri Surbakti; Marwan .; Muchlis .; Ibnu Rusydy; Nurul Aflah
Jurnal Natural Volume 18, Number 1, February 2018
Publisher : Universitas Syiah Kuala

It has been conducted a geo-electrical resistivity survey at geothermal area of Ie Jue, Aceh Besar. The survey aims to measure resistivity value in the area. It is expected that the values of resistivity will image the subsurface structure in the area. In addition geological features in the area are shown after we process it. The data acquisition in this study was acquired using a SuperSting R8/IP resistivitymeter and its data processing using EarthImager 2D software to get the image of resistivity pseudosection. The two lines of measurement crossed the surface geothermal manifestation. Each line has 330 m in length, and 56 electrodes with electrode space of 6 m. The result of resistivity pseudosection model interpreted based on geological condition and observation in the area. Resistivity pseudosection model shows the study is water-saturated (64.0 Ωm) to a depth of ±65 m and a highly conductive zone (0.6-3.5 Ωm) with a thickness of 30-50 m. This conductive layers below the embodied surface at a distance of 158-160 m on the IJ-Y1 line and at a range of 130-185 m on the IJ-Y2 line. This conductive zone is indicated as a weak zone where geothermal fluids are transported to the surface.Keywords: Geothermal, Ie Jue, geo-electrical resistivity survey, resistivityREFERENCES Bennet, J.D., Bridge, D.McC., Cameron, N.., Djunuddin, A., Ghazali, S.A., Jeffrey, D.H., Kartawa, W., Rock, M.N.S., Thomson, S.J., Whandoyo, R., 1981. PetaGeologiLembar Banda Aceh, Sumatera, Puslitbang Geologi. Bandung.Syukri, M., Saad, R., Nordiana, M., Azwin, I. 2014. Preliminary Study of Sumatera Fault Using 2-D Resistivity Imaging Method. Electronic Journal of Geotechnical Engineering, 19.Knödel, K., Lange, G., Voigt, H.J., 2007. Environmental geology: Handbook of field methods and case studies: Springer Science Business Media.Telford, W. M., Geldart, L. P., Sheriff, R. E. 1990. Applied Geophysics Second Edition, Cambridge University Press, USAMarwan, M., Rusydy, I., Nugraha, G.S. and Asrillah, A., 2014. Study of Seulawah Agam’s Geothermal Source Using Gravity Method. Jurnal Natural, 14(2)Asrillah, A., Marwan, M., Rusydy, I. and Nugraha, G.S., 2014. Application of Magnetics Method to Mapping the Geothermal Source at Seulawah Agam Area. Jurnal Natural, 14(2).Ismail, N.,Ramadhan, S., 2013. Karakterisasi Struktur Dangkal pada Lapangan Panas Bumi Seulawah Agam Menggunakan Metode Very Low Frequency (VLF). Prosiding Semirata FMIPA Universitas Lampung. Lampung, Indonesia.

Estimation of Site Amplifications from Shear-Wave Velocity at Pyroclastic Deposits and Basins in Aceh Tengah and Bener Meriah District, Aceh Province, Indonesia Ibnu Rusydy; Khaizal Jamaluddin; Eldina Fatimah; Syafrizal Syafrizal; Fauzi Andika; Yoshinori Furumoto
International Journal of Disaster Management Vol 1, No 1 (2017): June
Publisher : TDMRC, Universitas Syiah Kuala

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Earthquake on July 2, 2013, destroyed several buildings in Aceh Tengah district and Bener Meriah district of Aceh Province. This earthquake gives Aceh government a clue that the seismic hazard map must become the reference in development plan in future. To respond this idea, we conduct the research and try to estimate the amplification factor for developing seismic hazard maps of those districts. This study aims to determine the average shear wave velocity up to the depth of 30 meters (Vs30) and the amplification factor of Aceh Tengah district and Bener Meriah district, to build the seismic hazard map of both districts. In this study, we use the MASW (Multi-Channel Analysis of Surface Waves) with 24 geophones in the frequency of 10 Hz at 10 locations to determine the Vs30 beneath the surface. The soil and rock classification from ASCE 2010 and SNI 1726:2012 used to classify the soil/rock based on Vs30 and calculate the predicted amplification factor using the Borcherdt Eeri equation. The result of this study reveals that the range of Vs30 in the study area is 76 m/s – 308 m/s. The loosest sediment has 76 m/s located at point 2 in Aceh Tengah district. The shear wave velocity of 76 m/s classifies as soft soil (SE). Based on the calculation, the pyroclastic deposit and sediment in the basin of the study area will be amplified the seismic wave in the range of 2.9 to 3.3 times. In the future, we suggest conducting another geophysical survey to determine the correct amplification factor to improve the quality of seismic hazard map.

Geological Aspect of Slope Failure and Mitigation Approach in Bireun - Takengon Main Road, Aceh Province, Indonesia Ibnu Rusydy; Didik Sugiyanto; Lono Satrio; . Zulfahriza; Imam Munandar
Aceh International Journal of Science and Technology Vol 5, No 1 (2016): April 2016
Publisher : Graduate Program of Syiah Kuala University

A soil and rock slope assessment survey was conducted along Bireun – Takengon main road in Aceh Province, Indonesia. The slope assessment survey was carried out to determine the geological condition, verify and identify the potential areas of slope failure and to study what type of slope stability and protection method could be applied to the road. Several research methodologies were conducted in the field such as rock and soil identification, and slope assessment. The survey was conducted in four selected areas along Bireun – Takengon main road. In study area I, soil creep occurred because of a presence of montmorillonite clay. The mitigation methods to reduce soil creeping in this area are building a retaining wall and pile. The shotcrete, wire mesh, net rock bolting, and rock removal method is suitable to apply in study area II. The shotcrete and soil nails were used because the type of rocks in those areas is sedimentary rock such as shale, sandstone, siltstone, and a boulder of a volcanic rock. The same approach shall be applied in study area IV. study area III was the best spot to learn about the mitigation approach for slope stability and provides many lessons learned. Aceh Province experience active tectonic movement, high intensity of rain, geological structures, a high degree of weathering, and high intensity of earthquake,as primary factors which trigger landslides. The techonology of slope stabilizing and protection methods can be applied to mitigate landslides.

STUDI AWAL: ANALISA KECEPATAN GELOMBANG GESER (Vs) PADA CEKUNGAN TAKENGON DALAM UPAYA MITIGASI GEMPA BUMI Ibnu Rusydy; Khaizal Jamaluddin; Eldina Fatimah; Syafrizal Syafrizal; Fauzi Andika
JURNAL TEKNIK SIPIL Vol 6, No 1 (2016): Volume 6, Nomor 1, September 2016
Publisher : Jurusan Teknik Sipil, Fakultas Teknik, Universitas Syiah Kuala

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Abstract: MASW survey to determine the shear wave velocity (Vs) had been conducted in Takengon basin, Aceh Tengah district. The survey aims to identify sediment layers based on Vs analysis and its correlation with the amplification factor. The Vs yielded from MASW survey was based on the dispersion of Rayleigh wave generated by 4 kg sledgehammer and recorded on 24 geophones with 10 Hz. There are 3 locations of MASW measurement in Takengon basin, the first one located on the edge of the basin, the second location was in the middle of the basin, and the last one was located in the southern. The results of Vs from MASW then compared with soil type classification from ASCE 2010 and SNI 1726: 2012. The Vs in the first location dominated by a layer of soft soil (SE) with the Vs less than 175 m/sand indicate as the young sediment in the edge of the basin. The amplification factor is estimated to be 1.2 times of bedrock acceleration. On the second location, Vs ranged between 275-283 m/s and categorized as stiff soil (SD). This category concluded that, in the middle of the Takengon basin, the sediment was consolidated, and the amplification factor would be smaller compared to the first location. On the thirst location, in depth of 6.3 meter and constantly down to 30 meter, there is very dense soil or soft rock (SC) with Vs 372 m/sec in the form of sandstone. The Construction of high-rise buildings is possible around this third location as long as the foundation of the building should reach the depth of very dense soil (SC) at 6.3 meters.Keywords : Shear wave velocity, Vs, Takengon Basin, MASWAbstrak: Survei MASW untuk mengetahui kecepatan gelombang geser (Vs) telah dilakukan di Cekungan Takengon Kabupaten Aceh Tengah. Survei tersebut bertujuan untuk mengetahui kondisi tanah berdasarkan analisa Vs dan hubungannya dengan penguatan gelombang gempa bumi (faktor amplifikasi). Nilai Vs yang didapatkan dari MASW dengan cara memanfaatkan dispersi gelombang permukaan rayleigh dari sumber seismik berupa palu 4 kg dan terekam pada 24 geophone vertikal 10 Hz. Terdapat 3 titik pengamatan Vs di Cekungan Takengon, titik pertama di pinggir cekungan dekat perbukitan, kedua di tengah-tengah cekungan dan ke-tiga di sisi selatan. Hasil pengukuran Vs dari MASW akan dibandingkan dengan pengkelasan jenis tanah dari ASCE 2010 dan SNI 1726:2012. Hasil MASW menunjukkan bahwa nilai Vs di titik pertama didominasi oleh lapisan tanah lunak (SE) dengan nilai Vs kurang dari 175 m/det yang mengindikasi lapisannya masih muda. Di titik pertama ini, efek amplifikasi diperkirakan sebesar 1,2 kali dari nilai percepatan batuan dasar. Di titik kedua, nilai Vs antar 275 – 283 m/det dan masuk dalam kategori tanah sedang (SD). Kategori SD menunjukkan bahwa di tengah-tengah Cekungan Takengon endapannya lebih tua dan terkonsolidasi sehingga efek amplifikasi akan lebih kecil dibandingkan dengan titik pertama. Pada titik ketiga, dari kedalaman 6,3 meter sampai menerus ke bawah ditemukan lapisan tanah keras atau batuan lunak (SC) dengan nilai Vs 372 m/det berupa batupasir. Pembangunan gedung bertingkat tinggi dimungkinkan di sekitar titik ke-tiga ini dengan syarat pondasinya mencapai kedalaman tanah keras (SC) di 6,3 meter.Kata kunci : Kecepatan Gelombang Geser,Vs, Cekungan Takengon, MASW

ANALYSIS OF SHALLOW SUBSURFACE STRUCTURE AT GEOTHERMAL AREA OF IE JUE USING RESISTIVITY METHOD Syafrizal Idris; Muhammad Syukri; Muhammad Syukri Surbakti; Marwan .; Muchlis .; Ibnu Rusydy; Nurul Aflah
Jurnal Natural Volume 18, Number 1, February 2018
Publisher : Universitas Syiah Kuala

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24815/jn.v18i1.9676

It has been conducted a geo-electrical resistivity survey at geothermal area of Ie Jue, Aceh Besar. The survey aims to measure resistivity value in the area. It is expected that the values of resistivity will image the subsurface structure in the area. In addition geological features in the area are shown after we process it. The data acquisition in this study was acquired using a SuperSting R8/IP resistivitymeter and its data processing using EarthImager 2D software to get the image of resistivity pseudosection. The two lines of measurement crossed the surface geothermal manifestation. Each line has 330 m in length, and 56 electrodes with electrode space of 6 m. The result of resistivity pseudosection model interpreted based on geological condition and observation in the area. Resistivity pseudosection model shows the study is water-saturated (64.0 Ωm) to a depth of ±65 m and a highly conductive zone (0.6-3.5 Ωm) with a thickness of 30-50 m. This conductive layers below the embodied surface at a distance of 158-160 m on the IJ-Y1 line and at a range of 130-185 m on the IJ-Y2 line. This conductive zone is indicated as a weak zone where geothermal fluids are transported to the surface.Keywords: Geothermal, Ie Jue, geo-electrical resistivity survey, resistivityREFERENCES Bennet, J.D., Bridge, D.McC., Cameron, N.., Djunuddin, A., Ghazali, S.A., Jeffrey, D.H., Kartawa, W., Rock, M.N.S., Thomson, S.J., Whandoyo, R., 1981. PetaGeologiLembar Banda Aceh, Sumatera, Puslitbang Geologi. Bandung.Syukri, M., Saad, R., Nordiana, M., Azwin, I. 2014. Preliminary Study of Sumatera Fault Using 2-D Resistivity Imaging Method. Electronic Journal of Geotechnical Engineering, 19.Knödel, K., Lange, G., Voigt, H.J., 2007. Environmental geology: Handbook of field methods and case studies: Springer Science Business Media.Telford, W. M., Geldart, L. P., Sheriff, R. E. 1990. Applied Geophysics Second Edition, Cambridge University Press, USAMarwan, M., Rusydy, I., Nugraha, G.S. and Asrillah, A., 2014. Study of Seulawah Agam’s Geothermal Source Using Gravity Method. Jurnal Natural, 14(2)Asrillah, A., Marwan, M., Rusydy, I. and Nugraha, G.S., 2014. Application of Magnetics Method to Mapping the Geothermal Source at Seulawah Agam Area. Jurnal Natural, 14(2).Ismail, N.,Ramadhan, S., 2013. Karakterisasi Struktur Dangkal pada Lapangan Panas Bumi Seulawah Agam Menggunakan Metode Very Low Frequency (VLF). Prosiding Semirata FMIPA Universitas Lampung. Lampung, Indonesia.

KAJIAN STATISTIK SEISMISITAS KAWASAN SUMATERA Warni Asnita; Didik Sugiyanto; Ibnu Rusydy
Jurnal Natural Volume 16, Number 2, September 2016
Publisher : Universitas Syiah Kuala

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24815/jn.v16i2.4917

The research was conducted in order to identify the distribution of seismicity, repeated periods of earthquakes and the probability of earthquake in Sumatra using Likelihood Maximum methods. Earthquake data from the ISC and USGS catalogue were used. Earthquake data from 1914-2014 (100 year span) with magnitude of (M)≥5 SR and depth (h)≤100 km that is located at 60LS – 100LU and 920BT – 1080BT. The latitude and longitude coordinates were divided into 21 regions. The results showed distribution of seismicity in Sumatran as much as 3634 events of earthquake during the 100 last years. The distribution of seismicity in Sumatra is quite high. From data shown, there was value a, which is between 4.81 - 9.94 and value b which is between 0.54 - 1.32. This condition indicated an index value of M≥5 SR, which is between 0.006 - 0.076 and repeated periods between 13 - 175 years with the probability of earthquake M≥5 SR between 5.6% - 99.9% for T (time) = 10, 50 and 100 years.

A PRELIMINARY STUDY ON AQUIFER IDENTIFICATION BASED ON GEO-ELECTRICAL DATA IN BANDA ACEH, INDONESIA Didik Sugiyanto; Ibnu Rusydy; Marwan Marwan; Dian Mutia Hidayati; Asrillah Asrillah
Jurnal Natural Volume 18, Number 3, October 2018
Publisher : Universitas Syiah Kuala

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24815/jn.v18i3.11204

The aquifers exploration has been conducted at the western part of Banda Aceh, Indonesia. This research aims to explore the aquifer layer beneath the surface and to obtain the cross-section model of the aquifer. The Vertical Electrical Sounding (VES) method was applied to investigate the aquifer layer. The VES method worked as the current penetrated into the ground using of two electrodes and the potential response due to its current being measured by another two electrodes. Ten grid points of VES has performed in western part of Krueng Aceh of Banda Aceh using the ARES (Automatic Resistivity Meter). The Res1Dinv and curve matching computer software used in VES data processing and analysis. The result shows the resistivity value of aquifer in Banda Aceh city at the range of 1 – 12 Ωm for freshwater, and 0.1 – 0.6 for brackish water layer. The first aquifer (water table) found at a depth of 0.5 to 2 meters beneath the surface. The 2-meters water table mostly located near the coastal zone or downstream zone of Krueng Aceh basin and shallow depth of 0.5 meters on the upstream. More than one aquifer layers were found beneath the surface, they were separated by aquitard layer consisting of silt to clay layers.

IDENTIFICATION OF SUBSURFACE STRUCTURE USING SEISMIC REFRACTION METHOD AT JANTHO ACEH BESAR Muhammad Zikrilah; Didik Sugiyanto; Ibnu Rusydy
Jurnal Natural Volume 16, Number 2, September 2016
Publisher : Universitas Syiah Kuala

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24815/jn.v16i2.4916

An identification of subsurface structure in the surrounding area of Aceh Besar regent’s office was conducted by using seismic refraction method. The aims of this study are to determine the velocity value between layers in order to describe thesubsurface layer model, to identify the types of rocks on each layer, and to analyze the depth of bedrock layer located in the subsurface. There are 4 tracks with spaces in between each geophone, and on each track, with the width of 3 m. The total spread on the track is 72 m and the farthest shoot point is 36 m from the farthest geophone point.

Analisis geokimia air tanah di Kecamatan Lhoong dan sekitarnya, Kabupaten Aceh Besar Jannah, Raudhatul; Rusydy, Ibnu; Sartika*, Dewi; Muhni, Akmal
Acta Geoscience, Energy, and Mining Vol 3, No 4 (2024): December 2024
Publisher : Departemen Teknik Kebumian Universitas Syiah Kuala

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24815/actaGEM.v3i4.36726

Kecamatan Lhoong merupakan salah satu kecamatan dari Kabupaten Aceh Besar Provinsi Aceh. Peta geologi pada kecamatan ini masih mengandalkan peta geologi regional Lembar Banda Aceh dan belum ada pembaharuan hingga saat penelitian ini dilakukan. Selain itu, daerah penelitian merupakan daerah yang dekat dengan batugamping dan masyarakat pada daerah tersebut masih menggunakan air sumur dalam kehidupan sehari-hari. Tujuan dilakukannya penelitian ini untuk mengetahui kondisi geologi terbaru pada daerah penelitian, dan untuk mengetahui kondisi geokimia air tanah serta ketinggian muka air tanah pada daerah penelitian. Metode pemetaan geologi yang dilakukan berupa kegiatan mengamati singkapan dan pengamatan geomorfologi pada daerah penelitian. Sedangkan untuk mengetahui kualitas air tanah dilakukan pengujian sifat kimia antara lain TDS, DHL, pH serta anion dan kation yang dilakukan pada Laboratorium Balai Riset dan Standarisasi Aceh dan pada UPTD Laboratorium Energi dan Sumber Daya Mineral Aceh. Selain menguji geokimia air tanah pada daerah penelitian, juga dilakukan pengukuran terhadap ketinggian muka air tanah pada daerah penelitian pada 18 sumur pantau yang terdapat pada daerah penelitian. Dari kegiatan pemetaan geologi didapatkan hasil berupa geomorfologi yang dijumpai pada daerah ini terdiri dari tiga bentuklahan yaitu bentuklahan asal karst, bentuklahan asal vulkanik, dan bentuklahan berdasarkan ketinggian dan kemiringan lereng. Tatanan geologi pada daerah penelitian ini terdiri dari lima litologi batuan yaitu, endapan aluvium, batugamping, granodiorit, diorit dan basalt. Dari kegiatan penelitian air tanah pada daerah penelitian ini secara umum menunjukkan bahwa air tanah pada daerah ini aman untuk digunakan oleh masyarakat dengan nilai hasil pengujian TDS berkisar antara 34ppm - 116ppm, nilai hasil pengujian DHL berkisar antara 71s/cm - 231 s/cm. namun untuk nilai derajat keasaman (pH) berkisar antara 8,5 9,1 yang menunjukkan bahwa sampel air pada daerah penelitian memiliki derajat keasaman dari normal hingga basa. Hasil dari analisis geokimia air tanah yang diplot kedalam diagram sstiff dan diagram piper. Dari 5 sampel air tanah yang diambil sebanyak 4 sampel diantaranya yaitu sampel 1, 3, 4, dan 5 merupakan fasies air tanah magnesium bikarbonat (MgHCo3). Sedangkan sampel 2 merupakan faises air tanah campuran. Hasil akhir dari penelitian ini berupa peta geomorfologi, peta lintasan, peta geologi, peta arah aliran air tanah, dan peta kedalaman muka air tanah.

Pemetaan geologi dan studi fasies Formasi Alas di daerah Kecamatan Leuser dan sekitarnya, Kabupaten Aceh Tenggara, Provinsi Aceh Maulana, Rizki; Setiawan*, Bambang; Rozalli, Muhammad; Nugraha, Gartika Setiya; Rusydy, Ibnu
Acta Geoscience, Energy, and Mining Vol 3, No 4 (2024): December 2024
Publisher : Departemen Teknik Kebumian Universitas Syiah Kuala

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24815/actaGEM.v3i4.43423

Kecamatan Leuser adalah salah satu kecamatan yang berada di Kabupaten Aceh Tenggara, Provinsi Aceh, dimana peta geologi pada daerah ini masih merujuk pada informasi geologi regional Lembar Medan tahun 1982. Penelitian ini bertujuan untuk mempelajari kondisi geologi di daerah penelitian berupa struktur geologi, sejarah geologi dan geomorfologi daerah penelitian serta menganalisis fasies pada daerah penelitian dengan mengidentifikasi kondisi fisik sedimen di lapangan. Pemetaan geologi adalah suatu kegiatan pengumpulan data dan informasi geologi yang terdapat dalam suatu daerah penelitian yang menggambarkan penyebaran batuan, struktur, dan kenampakan morfologi bentang alam. Proses pemetaan ini dilakukan dengan cara survei langsung ke lapangan, melakukan pengamatan singkapan batuan dan pengambilan sampel batuan pada singkapan. Kegiatan yang dilakukan di lapangan berupa pemetaan geologi, pengukuran measured section singkapan Formasi Alas, dan pengambilan sampel batuan dari singkapan Formasi Alas sebagai keperluan penelitian lebih lanjut di laboratorium. Pengumpulan data sekunder dilakukan dengan studi literatur terkait dengan kondisi geologi regional daerah Leuser, dan pengolahan data pemetaan yang didapat dengan menggunakan software. Tatanan geologi daerah penelitian terdiri atas satuan batupasir berlapis, satuan perselingan batupasir dengan batulanau dan satuan batugamping. Satuan batupasir berlapis dan satuan perselingan batupasir dengan batulanau termasuk kedalam Formasi Alas (Ppa) dengan umur Karbon Akhir. Satuan batugamping termasuk kedalam Anggota Batugamping (Ppal) dengan umur Trias Awal. Sebaran fasies pada daerah penelitian berdasarkan analisa dan interpretasi data terdiri atas fasies mud flat, mixed flat, sand flat dan tidal channel yang termasuk ke dalam lingkungan pengendapan tidal flat.

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