bluuebunny/crossref_metadata_2025 huggingface dataset:
PEMANTAUAN PROSES INJEKSI AIR PADA LAPANGAN “SMR” CEKUNGAN SUMATERA TENGAH BERDASARKAN DATA ANOMALI TIME-LAPSE MICROGRAVITY
Authors: Zaenudin Ahmad , Pratiwi Dian , Wiyono Agung
Published: January 2020

There had been done a regional research about monitoring of injection process in "SMR" field of Central Sumatera Basin using microgravity method. The time-lapse microgravity method is the development of the gravity method (x, y, z) by adding the fourth dimension of time (t). Monitoring is carried out on production fields that have performed EOR (Enchanced Oil Recovery) ie the process of injecting water into the reservoir to push and drain the remnants of oil in the pores of the reservoir rock to the production well. The microgravity data processing is done by finding the difference between observed gravity values between the first and the second measurements, then performing the spectral analysis to separate the anomaly at reservoir depth and noise. The time-lapse microgravity anomaly has a value of -132.28 μGal to 54.89 μGal. Positive anomalies are related to the injection process, whereas the negative anomalies are related to the production process in the study area. Filtering analysis shows that there are two zones of fluid dynamics, which is due to the process of surface water dynamics (groundwater above reservoir) and that occurs in the reservoir. Fluid reduction zones occur in areas with more production wells than injection wells. Density reduction occurs in the reservoir layer at a depth of 600 m to 1000 m with a maximum reduction value of -3.1x10-3 gr / cm3. The gravity time-lapse inversion model shows the existence of several injection wells that are less effective and therefore need to be stopped injecting.
PENGHILANGAN SWELL NOISE DAN LINIER NOISE PADA DATA SEISMIK 2D MARINE HIGH RESOLUTION PADA LINTASAN “AF” MENGGUNAKAN METODE SWNA, F-K FILTER DAN TAU-P TRANSFORM
Authors: Subari Achmad , Rasimeng Syamsurijal , Konstanta Nando Liven
Published: January 2020

Research have been done about noise removal caused by environment (swell noise) and linear noise on high frequency 2D seismic data on line “AF” using swell noise attenuation (SWNA) method, f-k filter and tau-p transformation. Based on obtained result, swell noise succeed removed from data using velocity limited filter that is 1000 m/s on frequency 25 Hz applied to swell noise attenuation process. Applied SWNA data, then created input f-k filter process. In f-k filter process, used polygon design having a minimum frequency limit around 5 Hz maximum high frequency around 450 Hz. The results f-k filter giving a good output with linear noise removal to time 1500 ms. F-k filter output obtained, then processed again using tau-p transformation method. Application of tau-p transformation transformed data into (τ-p) domain. Transformed data on (τ-p) domain, linear noise made on moveout 600 ms. Then the data muted using surgical mute. Based on obtained result, tau-p result can removing linear noise on data. Linear noise removed dominating on time 1500 ms-2500 ms. That matter caused by linear noise on time 0-1500 ms succeed removed using previous process. After the method succesfully applied , data processing continued doing the stack and migration process. Applied migration is postack kirchoff time migration, migration do with migration angel around 300 and aperture around 600 m.
Front Cover JGE Vol 4 No 1 2018
Authors: JGE Editor
Published: January 2020

xxx
PRE STACK DEPTH MIGRATION UNTUK KOREKSI EFEK PULL UP DENGAN MENGGUNAKAN METODE HORIZON BASED DEPTH TOMOGRAPHY PADA LAPANGAN ‘A1 DAN A2’
Authors: Azzahra Attikah , Mulyatno Bagus Sapto , Mujihardi Bambang
Published: January 2020

In the case of seismic data processing with sandstone lithology such as shale and carbonate often get the result of data processing which have pull up effect especially on the time domain migration result. Pre stack depth migration is a processing based on focusing the amplitude according to the actual depth by using the input interval velocity. Migration is performed using kirchhoff pre stack depth migration algorithm. Pre stack depth migration is done with modeling of horizontal based depth tomography method. This method uses residual moveout correction applied along the horizon-picking line. This research uses two field data that is A1 and A2 Field. A1field has characteristics of carbonate rock that produce pull up shaped similar to carbonate layer. A2 field has a pull-up effect that is not very clear but has build up because of the layer above it. Stages performed starting from the processing of pre stack time migration in the form of velocity picking, generate rms velocity and migration time domain. The pre stack depth migration process begins with a velocity transformation with the dix transformation equation to generate interval velocity, migrate Pre stack depth migration, perform horizon interpretations and perform velocity modeling using the horizon based depth tomography method. The iteration is done 4 times and resulted in the final section of pre stack depth migration which has been corrected by pull up effect.
IDENTIFIKASI DAN ESTIMASI SUMBER DAYA BATUBARA MENGGUNAKAN METODE POLIGON BERDASARKAN INTEPRETASI DATA LOGGING PADA LAPANGAN ”ADA”, SUMATERA SELATAN
Authors: Adrian Deddi , Mulyatno Bagus Sapto
Published: January 2020

As petroleum reserves depleted, certainly encourage the government to search for new energy sources. Eksploration of coal is the right choice because  its potential is so great in Indonesian especially in South Sumatera Province is known have content 37,80% from total resources in Indonesian. Well loggging method is one of geophysics method used to find and estimate coal resources. Advantages of well logging method is able to describe subsurface laterally. The purpose of this study is displaying an overview of subsurface rock layers, determine the direction of distribution by correlating coal seam between wells based on data logging, and to estimate coal resources in the research area. The total area of the author's research is 442.056 m2 has 10 wells. Log data used in this study is gamma ray log dan density log, where coal seams are characterized by gamma ray log response and low log density responses. On the field ”ADA” found four coal seam, that is seam A1 with thickness 8,28 m, seam A2 with thickness 13,62 m, seam B with thickness 18,50, and seam C with thickness 8,84. Direction of coal distribution from South to North with slope angle 5-30º and direction of sincerity from East to West. The author calculates the estimated coal resource using polygon method because this calculates method can be done with a short time and the results are right. Total coal by polygon method of 18.322.653 m3 in tons of 21.987.184–27.483.980 ton while calculations with software rock works 15 amount 18.786.254 m3 in tons of 22.543.505–28.179.381 ton.
RELOKASI HIPOSENTER GEMPABUMI MENGGUNAKAN METODE MODIFIED JOINT HYPOCENTER DETERMINATION (MJHD) UNTUK ANALISIS ZONA SUBDUKSI SUMATERA BAGIAN SELATAN
Authors: Sari Deswita , Khairina Fadiah , Daniarsyad Gatut
Published: January 2020

The part of south Sumatera is very vulnerable region in case of earthquake disaster caused by convergent boundary of two tectonic plates Indo-Australian Plates and Eurasian Plates. Precise hypocenter analysis is needed to understand about  the accurate tectonic setting such as subduction zone in the area. Hypocenter relocation is used to recalculate earthquake hypocenter to become more accurate. To produce a more accurate hyposenter this hyposenter relocation is done by using the method of Modified Joint Hypocenter Determination (MJHD). Relocation using the Modified Joint Hypocenter Determination (MJHD) method uses IASP91 wave velocity which assumes that the inner structures are heterogeneous. In this study, used data P-wave and S-wave  arrival time in the period January 2010 s.d December 2016 with coordinates -3.5º s.d -9º LS - 99º s.d 106.5º BT. The results of the relocation using MJHD showed a change of earthquake hypocenter shown by RMS (Root Mean Square) value ranging from 0.2 s.d 0.5. There are three subduction of the part in south sumatra. The subduction zone formed in Bengkulu is about 26.78º, the subduction zone of Lampung is around 30.225º and the subduction of the Sunda Strait is about 52.53º. Subduction zone of Bengkulu at depth of 250 km, Lampung and Sunda Strait at depth 400 km.
OPTIMALISASI DAN ANALISIS DESAIN PARAMETER SEISMIK 3D DARAT BERDASARKAN MODEL GEOLOGI LAPANGAN “RL”
Authors: Lubis Ravide , Mulyatno Bagus Sapto , Karyanto Karyanto
Published: January 2020

The design of 3D land seismic parameters is a preliminary step before the acquisition of 3D land seismic data to obtain seismic data quality and efficient survey budget. The objective of this research is to obtain high quality of 3D land seismic data based on fold coverage spread on each target layer. The method used is based on the principle of wave propagation or ray tracing method on each target layer, wherein each wave reflection point (bin) will have a different value of fold so that the required configuration of the stretch that will result in the optimal spread of the fold. The applied stretch configurations are orthogonal, brick, zig-zag and slanted where each stretch configuration uses two types of templates that is narrow and wide azimuth. From the simulation analysis results of several stretch configurations in the survey area, then the optimal stretch configuration will be obtained in the survey area. The stretch configuration will be applied is the configuration of orthogonal stretch with narrow azimuth type template. Consideration of the selection of this stretch configuration because it has a more evenly folding effect on the target layer than with other stretch configurations. Furthermore, to obtain the configuration of the appropriate stretch of field conditions, the source point is moved outside the obstacle zone so that the quality of seismic data is maintained.
Studi Identifikasi Struktur Geologi Bawah Permukaan Untuk Mengetahui Sistem Sesar Berdasarkan Analisis First Horizontal Derivative (FHD), Second Vertical Derivative (SVD), Dan 2,5D Forward Modeling Di Daerah Manokwari Papua Barat
Authors: Zaenudin Ahmad , Yulistina Shiska
Published: January 2020

In general, Manokwari has a geological structure that is in the form of a folding area found in the highlands of the mountains. Among the creases, there is a fault up and the fault down. In coastal or marine areas found many reefs and corals. The study of gravity was conducted in the Manokwari area of West Papua with the aim to know the subsurface geological structures based on FHD (First Horizontal Derivative), SVD (Second Vertical Derivative) and 2.5D Forward Modeling on the residual anomaly maps of the study area. The results showed that the research area has Bouguer Anomaly value ranged from 4 mGal to 96 mGal with the low anomaly at the left side of the research area lengthwise relatively in north-west to south-east direction, the middle-value anomaly spreads in the west-east area of research area, high anomaly scattered in the northern part of the research area. The results of the 2.5D subsurface modeling and the SVD and FHD analysis indicated the presence of a Thrust Fault on the C-C’ cross-section, on the B-B’ cross-section there is a Diorite Lembai intrusion with the density value is 2.75 gr/cc, whereas the A-A' cross-section which intersects with Sorong fault were not found any fault or rock intrusion based on observed gravity data of the research area.
ANALISIS ANOMALI SINYAL ULTRA LOW FREQUENCY BERDASARKAN DATA PENGUKURAN GEOMAGNETIK SEBAGAI INDIKATOR PREKURSOR GEMPABUMI WILAYAH LAMPUNG TAHUN 2016
Authors: Wahyuningsih Ulfa , Rasimeng Syamsurijal , Karyanto Karyanto
Published: January 2020

Regional research had been done to analysis anomalies signal of ultra low frequency based on measurement data as an indicator of the geomagnetic earthquake precursor of lampung in 2016. To achieve purpose of the study conducted by the following steps: (i) Calculation of the total magnetic field of data; (ii) Daily Trend Analysis; (iii) the Fourier transform of the data Geomagnetic Anomaly; (iv) Localization Frequency ULF; (v) Calculation of Ratio Vertical-Horizontal (Polarization Ratio Z / H); (vi) Correction magnetic storms or Disturbance Strom Time (DST); (vii) the identification of earthquake precursors; (viii) Determination of OnsetTime, leadtime,and the direction of precursors. The results of the analysis of ten earthquakes with a magnitude above 5 MW have precursors between 11 to 30 days before an earthquake. Nine out of ten earthquakes studied had an earthquake precursors and precursors that do not have, this is because the distance is too far from the station Magdas in Liwa, West Lampung. Thus it can be seen that the precursor using the magnetic data can be used to make short-term predictions.
IDENTIFIKASI STRUKTUR BAWAH PERMUKAAN MENGGUNAKAN METODE MAGNETOTELLURIK 2D DI DAERAH CEKUNGAN BINTUNI SEBAGAI POTENSI HIDROKARBON
Authors: Yulianti Ririn , Rasimeng Syamsurijal , Karyanto Karyanto , Hidayat Hidayat , Indragiri Noor Muhammad
Published: January 2020

Magnetotelluric research was done in hydrocarbon prospect area of Bintuni basin, West Papua province. The purpose of this research is to identificate hydrocarbon prospect in subsurface structure using 2D resistivity section. Data processing step for the research are; (i) Data transformation from time domain to frequency domain using Fourier transformation. (ii) Filtering process using Robust No Weight, Robust Rho Variance and Robust Ordinary Coherency. (iii) XPR selection and formatting data into EDI file. (iv) 2D resistivity section modeling using inversion. The result of this research based on 2D resistivity section in Klasafat formation have resistivity value about 1 – 20 Ωm. From 0 until 1000 meter below the surface the main lithology is claystone that identified as caprock. Kemblengan formation have resistivity value about 20 – 90 Ωm in 3500 meter under surface with main lithology lime-sandstone and identified as a reservoir. Tipuma formation have resistivity value about 0.62 – 2 Ωm in 8000 meter under surface with main lithology claystone. Kemun formation have resistivity value about 20 – 32 Ωm in 6000 meter under surface with main lithology sandstone and identified as a basement.
KLASIFIKASI PETROFISIKA TIPE BATUAN UNTUK MEMPREDIKSI KUALITAS RESERVOAR PASIR SERPIHAN PADA FORMASI TALANG AKAR, CEKUNGAN ONWJ
Authors: Priyanka Feni , Mulyatno Bagus Sapto , Ariffiandhany Riezal
Published: January 2020

Hydrocarbons were accumulated in reservoir, the reservoir has a lot of types depending on the geological conditions and the constituent mineral. In ONWJ basins, sub-basins Arjuna, Talang Akar Formation is sand splintersreservoir type. The presence of clay in a reservoir will reduce the resistivity and increase thesaturation, so it takes a multimineral analysis and the reservoir qualityclassification. In this study, physical properties (porosity, permeability, Rw, and saturation) and the quality of the reservoir can be identified through petrophysical analysis by utilizing log data and core analysis, and the rocktypeprediction(using R35 Winland or HFU method). In this study 5 wells (IX-A1, IX-13, IX-4, IX-7 and IX-8)used and found eight hydrocarbon zones, 6 are validated by the DST (drill steam test)data, androck type method that suitable is the method of HFU (hydraulic flow units) due to the coefficient of correlation between porosity and permeability shows a value of 0.75, based on the calculations, the eight types of rock is conclude, where the dominance of the rock typeis the type 12 with a pore size between 5-10 microns, type reservoir rocks in this study belong to the lithofacies distributary channel and mouthbar sand. By knowing the petrophysical property values, it can determine reservoir productivity and determine the zone eligible to be produced or not, by using curve SMLP (Stratigraphic Modified Lorenz Plot).
PENENTUAN LITOLOGI LAPISAN BAWAH PERMUKAAN BERDASARKAN TOMOGRAFI SEISMIK REFRAKSI UNTUK GEOTEKNIK BENDUNGAN AIR DAERAH “X”
Authors: Sabiq Hilman , Rasimeng Syamsurijal , Karyanto Karyanto
Published: January 2020

Batang Toru river which is through Kecamatan Sipirok, Kabupaten Tapanuli Selatan, will be a hydro-electric power plant, in order to require the electricity in North Sumatera area. Therefore, refraction seismic survey needed to determine the subsurface litology, as a guide in the construction of river water dam in that area. This study aims to determine lithology in the research area based on cross-section of refraction seismic tomography, and to estimate the depth and thickness of the rock layers beneath the surface of the study area. Refraction seismic tomography produces a cross section which shows the distribution of velocity value to depth, so we obtain the interpretation of rock lithology and depth estimation of each layer. The first layer is a topsoil layer with a velocity range of 100-700 m/s, the thickness of the topsoil is estimated to be about 1-10 meters. The second layer is indicated as a tuff-sandstone with medium consolidation with a velocity range of 600-1800 m/s, with an estimated thickness about 10-35 meters. The third layer is indicated as a tuff-sand rock to tuff-breccia with a value range higher than 1800 m/s, with an estimated depth of 30-40 meters from the surface.
ESTIMASI KANDUNGAN SERPIH (Vsh), POROSITAS EFEKTIF (∅e) DAN SATURASI AIR (Sw) UNTUK MENGHITUNG CADANGAN HIDROKARBON PADA RESERVOAR LIMESTONE LAPANGAN “PRB” DI SUMATERA SELATAN MENGGUNAKAN DATA LOG DAN PETROFISIKA
Authors: Purba Leo Rivandi , Mulyatno Bagus Sapto
Published: January 2020

Log and petrophysics data of research area are that located in South Sumatera Basin, exactly at formation Baturaja will be used for counting the hydrocarbon stock in research field. There are 3 the well datas prosessed to determine the prospect layer of hydrocarbon and estimate the hydrocarbon stock in the productive zone by using 1 petrophysic data from well PRB-3. In order to determine the productive zone of hydrocarbon, the first thing to do is to determine the petrophysics parameters. Parameters used is shale content, effective porosity and water saturation. The value of shale content on “PRB” field shows that reservoir is clean from shale minerals. But, based on the saturation of water, type hydrocarbon in reservoir it is natural gas. Based value of three parameters last, the field “PRB” having 6 zone productive hydrocarbon in each ecploratory wells.  Then, determine zone net pay that had been determined by using the cut-off of shale content which is 8% it means hydrocarbon will be produced if the value of shale content under 8%, effective porosity is 5% it means hydrocarbon will be produced if the value of porosity of effective larger than 5% and water saturation is 70% it means that the value of water saturation on field “PRB” must be less than 70% that hydrocarbon can be produced. Average thickness of the net pay in well PRB-1 is 6.78 meter. In well PRB-2, the average thickness is 7.37 meter while in well PRB-3 it is 3,825 meter. The average thickness from those three wells is 3,005 meter. The mean effective porosity of those 3 wells is 8,1% and the mean water saturation is 27,2%. Gas volume formation factor (Bg) is 0,0226 bbl/SCF which the area width is 28 km2. Natural gas stock (OGIP) in this research area is 7,764 BSCF.
Front Cover JGE Vol 4 No 3 2018
Authors: JGE Editor
Published: January 2020

xxx
Introduction and Table of Content JGE Vol 4 No 3 November 2018
Authors: JGE Editor
Published: January 2020

xxx
ANALISIS RESERVOAR MIGAS (SANDSTONE) MENGGUNAKAN MULTIATRIBUT SEISMIK PADA LAPANGAN TG12, CEKUNGAN BARITO, KALIMANTAN SELATAN
Authors: Pratama Edo , Mulyatno Bagus Sapto , Zaenudin Ahmad
Published: January 2020

The study using multi attribute seismic has been done on TG12 field which situated at Lower Foreland Formation, Barito Basin dominated by sandstone on layer area of the target X. The objective of the study is to map the sandstone reservoir by predict distribution value of gamma ray log, neutron porosity, and density which goes through wells such as FM1, FM2, FM3, and FM4 on seismic data. Total attribute that is being used by step wise regression method by considering validation error. Multiattribute process only applied on FM2, FM3, and FM4 wells, whereas FM1 is used as a test well to determine the correlation value between seismic data and log data that is being used. In addition, from well test correlation showing great correlation result of neutron porosity log and density log both obtain the correlation around 0.6322 and 0.6557 while the gamma ray log obtain low correlation that is 0.1647 towards multi attribute result. The processing result of multi attribute obtained distribution of sandstone with gamma ray estimation range value of 65-75.8API, neutron porosity estimation range value 0.15-0.2262, while density estimation range value 2.4308-2.77gr/cc.
APLIKASI METODE GEOLISTRIK RESISTIVITAS KONFIGURASI WENNER- SCHLUMBERGER UNTUK MENGIDENTIFIKASI LITOLOGI BATUAN BAWAH PERMUKAAN DAN FLUIDA PANAS BUMI WAY RATAI DI AREA MANIFESTASI PADOK DI KECAMATAN PADANG CERMIN KABUPATEN PESAWARAN PROVINSI LAMPUNG
Authors: Pratama Wilyan , Rustadi Rustadi
Published: January 2020

Research area is located in Padang Cermin Sun-District, Pesawaran Regency, Lampung Province. Manifestation in research area is hot water pool with surface temperatures reach 900C. Data acquisition has been done by Wenner-Schlumberger configuration with 5 acquisition line. Line 1, line 4 and line 5 have 280 meters length. Line 2 have 240 meters length and line 3 have 320 meters length with a spacing of each electrodes in each lines is every 5 meters. The objective of this research are (1)examining the geochemical contaminant and fluid types, (2)identifies the geothermal fluid based on 2D and 3D resistivity data analysis, also (3)identifies the layer of rock in Padok manifestation area based on 2D and 3D subsurface resistivity section. Subsurface lithology in research area generally divides into 4 parts. Which is hot water fluid with mean resistivity value between 1 Ωm into 3 Ωm and based on geochemistry data the fluid type is chloride water; surface sediment with resistivity value between 6 Ωm into 50 Ωm and identified as swamp sediment and alluvium sediment divides into gravels, pebbles, sands, clay and peat; Gravels, pebbles, sands, clay and peat with resistivity value between 50 Ωm into 100 Ωm; and igneous rock (andesite-basalt) with resistivity value more than 100 Ωm.
PENGOLAHAN DATA MIKROTREMOR BERDASARKAN METODE HVSR DENGAN MENGGUNAKAN MATLAB
Authors: Yuliawati Winda Styani , Rasimeng Syamsurijal , Karyanto Karyanto
Published: January 2020

The research has conducted to get the result of Matlab program for microtremor data processing. The purpose of this research is to apply Matlab software into microtremor data processing. The microtremor is the ground motion to identify earthquake vulnerability by using HVSR (Horizontal to Vertical Spectral Ratio) method. The HVSR method for comparing both of horizontal component and vertical component on microtremor wave to obtain the result dominant frequency(f0) based on the high spectrum H/V value from the analysis of HVSR curve. Based on this research which concludes that microtremor data processing has processed using Matlab software. The result of this data processing gives similar value from the geopsy software. The value of dominant frequency by Matlab software and geopsy software calculation are classified on the site class type II which is dominantly alluvium. Whereas, the result of dominant period by geopsy and Matlab are classified on the site class type I which shows as the bedrock.
PENDUGAAN PATAHAN DAERAH “Y” BERDASARKAN ANOMALI GAYABERAT DENGAN ANALISIS DERIVATIVE
Authors: Aufia Yasrifa Fitri , Karyanto Karyanto , Rustadi Rustadi
Published: January 2020

The research area "Y" is an area of gold mineralization with low sulfidation epithermal type deposit. The existence of this type of mineralization on the path marked by the presence of mineral deposits, which form the quartz veined below the surface of the deposited within the structure of the fault. In this study, analysis of gravity data using derivatives analysis, i.e. First Horizontal Derivative (FHD) to determine the boundary fault structure and Second Vertical Derivative (SVD) to determine the type of fault. The existence of the fault structure integrated with subsurface modeling results in two-dimensional and three-dimensional. The results showed three line slice made in the area of research, identified structure of down faults (normal) trending northeast - south on slice 1 with an estimated dip (slope) is 22° and expected of strike on this fault is N 158° W and thrust fault structure trending northwest - south on slice 2 also slice 3 with an estimated dip (slope) is 22° and expected of strike on this fault is N 158° E. The results of the modeling of two-dimensional and three-dimensional show fracture structure is at the density of 2 g/cc – 2,67 g/cc in the depth of around 100 m - 250 m that consists of sedimentary rocks (clay and sandstone) with a density of 2,2 g/cc – 2,3 g/cc at the age of Tertiary Pliocene, tuff rock with a density of 2,4 g/cc – 2,5 g/cc at the age of Early Miocene and bedrock (basement) in andesite form with a density of 2,67 g/cc.
ANALISIS ZONA BAHAYA GEMPABUMI BERDASARKAN METODE DETERMINISTIK DAN PENDEKATAN GEOMORFOLOGI KOTA PADANG SUMATERA BARAT
Authors: Riyanti Azis , Rasimeng Syamsurijal
Published: January 2020

Research on earthquake hazard analysis based on deterministic methods and the geomorphology approach of Padang City has been carried out to determine the maximum soil acceleration (PGA) and amplification of the source of the Suliti faults and Earthquake Subduction and determine soil classes based on shear waves (Vs30). The PGA value, several attenuation equations are used to find the magnitude of the shock produced when a shallow earthquake occurs. For the source of fault earthquakes, the attenuation equations used are the equivalent of Boore-Atkinson, Campbell-Bozorgnia, and Chiou-Young. While the attenuation equations used to obtain PGA values from subduction earthquake sources are Atkinson-Boore, Youngs, and Zhao. PGA value of earthquake source Subduction in bedrock 0.0374 g. While the PGA value on the surface is 0.0769 g. Whereas the PGA value in the fault source (Hard Fault) in bedrock ranged from 0.0376 g, while the PGA value on the surface ranged from 0.0573 g. Areas that have a severe impact if an earthquake originates from a fault are Koto Tengah District, West Padang Subdistrict, and North Padang Subdistrict with the highest amplification value of 1.7690 ( 9 times) which indicates that the magnification of the area is high. Whereas in the case of an earthquake with an earthquake source subduction area which is very vulnerable is West Padang District, Koto Tengah District, Padang Utara District with an amplification value of 2.0607 ( 9 times).
INTERPRETASI SISTEM PANAS BUMI SUWAWA BERDASARKAN DATA GAYA BERAT
Authors: Rizkiani Dian Nur , Rustadi Rustadi
Published: January 2020

The research of gravity on Suwawa Sub-District geothermal is done for the purposes to determine fault structure using Second Vertical Derivative (SVD) technique, create a 2D subsurface model and 3D tentative model using regional anomaly data, and interpreting Suwawa geothermal system. Data processing is done in the research include: drift correction, terrain correction, free air correction, complete Bouguer anomaly, spectral analysis, SVD analysis, 2D modeling and 3D inversion modeling and tentative model. The research results showed that the research area has low Bouguer anomaly with a range of 75.8 to 79.5 mGal values in the West and Southeast, while high anomaly with a range of 90.9 to 111.2 mGal values in the Northern and Southern, there is correlation of fault based on SVD analysis with geological fault that indicate the presence of Libungo hot springs, the inversion results indicate the presence of low density (ρ = 1.8 g/cc) which is an alluvial rocks and high density (ρ = 2.9 g/cc) which is Andesite Lava rocks, 3D tentative modeling indicate the presence of reservoir is at a depth of 2 km from the ground surface. Based on the model created, Cap Rock is located on Andesite Lava rocks with ρ = 2.9 g/cc at a depth of 1200 m and Heat Source located at a depth of 2000 m.
ANALISA LUASAN TERUMBU KARANG DI PERAIRAN PULAU TEGAL LAMPUNG DENGAN TEKNOLOGI PENGINDERAAN JAUH
Authors: Muhtar Faris , Armijon Armijon , Murdapa Fauzan , Fadly Romi
Published: January 2020

Damage to coral reefs on Tegal Island has an impact on reducing coral reef habitats, so monitoring needs to be done. Monitoring is done by analyzing the extent and changes by utilizing remote sensing technology to map the existing conditions. The data used are Landsat imagery in 1998, 2008, 2015 and 2018. Digital image processing is done starting from image correction, lyzenga algorithm calculation, image interpretation and field validation, and accuracy testing of coral reef habitats using a confusion matrix. The results showed that there was a change in the area of coral reefs from 1998 to 2018. The coral reef class experienced a reduction of 11.22 ha. Coral classes that changed into sand classes were 9.13 ha (29.49%) and seagrasses were 4.38 ha (14.15%). The class of sand that turned into coral reefs was 2.08 ha (13.52%) and seagrass classes that turned into coral reefs were 0.21 ha (0.25%). The biggest change is the change in the coral reef to sand covering an area of 9.13 ha (29.49%), while the smallest change is the change in seagrass into a coral reef covering an area of 0.21 ha (0.25%). In the other classes, the biggest change in area was seagrass change into sand covering an area of 5.76 ha (6.96%), while the smallest change was the change in the sand to seagrass covering an area of 2.67 ha (17.35%).
PEMODELAN 3D STRUKTUR BAWAH PERMUKAAN GUNUNGAPI AGUNG PROVINSI BALI MENGGUNAKAN METODE GAYA BERAT
Authors: Ilmi Nasyratul , Karyanto Karyanto
Published: January 2020

Under surface structure, 3d modelling of Agung volcano in Bali had been conducted by using gravity methods. This research aims to identify the magma chamber and make a model below the surface of the Great Volcano of Bali Province by using gravity anomaly data. Data processing methods performed in this research were consists of six steps: (i) arrangement the contour map of Bouguer anomaly, (ii) spectrum analysis, (iii) anomaly regional and residual separation, (iv) Second Vertical Derivative analysis, (v) cross-section of subsurface geology construction by using 3D (inverse modelling), (vi) qualitative and quantitative interpretation. Anomaly Bougeur contour map result shows the value of Bouguer anomaly in research area around 84 mGal spreading around west-south part of research point until 279 mGal on Agung volcano body. Anomaly regional value is around 97 mGal to 253 mGal. The boundary between basement a sedimentary rock of the research area are at the depth of 0,89 km. The magma chamber of Agung volcano is in the depth of 500 to 8000 metres to a form of towing up and polluted in the middle. The density of the magma chamber is around 2,73 until 2,86 gr/cc. The magma flow in the Agung volcano of visible at the depth of 0 metres.
Introduction and Table of Content JGE Vol 5 No 2 July 2019
Authors: JGE Editor
Published: January 2020

xxx
DESAIN DAN REALISASI ACCELEROMETER BERBASIS ARDUINO SEBAGAI INSTRUMEN PENDETEKSI MIKROTREMOR
Authors: Amiruddin Ahmad , Suharno Suharno , Karyanto Karyanto
Published: January 2020

To investigate soil vulnerability zones, one of the methods is microtremor analysis to analyze soil characteristics based on the natural frequency of the soil layer. However, the technology used to obtain the data is still expensive. Considering the need for this technology, this research was conducted to design a tool used as a microtremor analysis with Arduino-based accelerometer which is affordable and easier to use.  As a result, the design of the accelerometer body size is 18.5 cm x 12 cm x 7 cm with the bottom side of the box made of the iron plate as a vibration medium and the lid box is made of mica. The program system can work efficiently with a maximum sampling rate of data collection of 500/s. From the validation test, the f0 value of the HVSR curve from the accelerometer tool ranges from 0.19 Hz - 0.93 Hz. Whereas from the reference tool Reftek Accelerograph produces a range of 0.18 Hz - 0.90 Hz. The smallest difference between the two measurement tools is 0.0072 Hz at point 1 and the biggest difference is 0.1299 Hz at point 3. The average difference between the two values of f0 is 0.0377 Hz.
ANALISIS PENDUGAAN BAHAYA KEGEMPAAN DI BATUAN DASAR UNTUK WILAYAH LAMPUNG MENGGUNAKAN METODE PSHA
Authors: Pangaribuan Mhd Azri , Rasimeng Syamsurijal , Karyanto Karyanto , Rudianto Rudianto
Published: January 2020

Analysis of seismic hazard estimation is one method for estimating the effect of earthquakes. The purpose of this study was to determine the maximum value of ground acceleration in bedrock or PGA values for the Lampung Province region. This analysis of seismic hazard estimation is carried out by a probabilistic seismic hazard analysis (PSHA) method. In the process of estimating the influence of earthquakes, the PSHA method principally uses 3 types of earthquake sources, namely the source of background earthquakes, subduction earthquakes (earthquake subduction) and fault earthquakes (faut). The calculation of the estimated seismic hazard value is carried out using the 2007 USGS PSHA program. The distribution of seismic hazard values for the Lampung Province region on bedrock with a 500-year return period or a 10% probability on the PGA condition (T = 0) is 0.1 g to 1, 3 g and a 2500 year return period or a probability of 2% in the PGA condition (T = 0) is 0.1 g to 1.3 g.
KAJIAN LOKASI POTENSIAL PERUMAHAN DAN PERMUKIMAN DI KABUPATEN PESAWARAN DENGAN SISTEM INFORMASI GEOGRAFIS (SIG)
Authors: Maretta Nadian , Dewi Citra , Murdapa Fauzan , Rahmadi Eko
Published: January 2020

Pesawaran District, as a new district which was established in 2007, has experienced a rapid growth in population. As the population increases, housing and residential land needs will increase. Therefore, there should be a careful planning in determining the location of housing and settlement development in Pesawaran District. This study aims to: 1) Know the weight for each parameter used in determining the level of potential for a land for the development of housing and residential areas with method AHP 2) Know the potential level of land in Pesawaran District for the development of housing and settlements. The method used is AHP (Analytic Hierarchy Process), while the method by spatial analysis using GIS (Geographic Information System).The results of the study with AHP calculations show that the most dominant parameter is accessibility. The reason is, accessibility will affect the ease of transportation services and affordability of distance. The results of the analysis using GIS resulted in 5 potential locations for the development of residential and residential areas in Pesawaran District which are very potential (13456.50 ha), potential (47941.61 ha), quite potential (47362.11 ha), less extensively potential (16107.09 ha), and no potential (8251.13 ha).
IDENTIFIKASI BIDANG GELINCIR PADA DAERAH RAWAN LONGSOR DESA SRIMARTANI, YOGYAKARTA
Authors: Zakaria Muhammad Faizal , Maisarah Siti Masyithoh
Published: January 2020

Landslides are one of the disasters that often occur in Srimartani Village, Piyungan District, Yogyakarta. The biggest cause of landslides is the steep slope and the existence of a sliding plane on the slope. This study aims to identify the sliding plane on the slopes in Srimartani Village. This research was conducted using geoelectric method Wenner configuration with a: 10 m and n: 6. The data acquisition was taken in 6 lines. Data processing was done using Res2Dinv software and the result is a 2D true resistivity cross section. The results of the interpretation of the six lines indicate the existence of a sliding plane which is characterized by low resistivity contrast at the bottom and higher resistivity near the surface. Low resistivity (10 Ωm) is identified as clay rock and high resistivity ( 10 Ωm) above is identified as surface soil.
CÁLCULO DE BIOMASA AÉREA Y CARBONO CAPTURADO DE LA RESERVA YANACOCHA A TRAVÉS DE IMÁGENES SATELITALES
Authors: Echeverría Armando , PACHACAMA RICARDO , VILLAVERDE YOLANDA , PROAÑO NICOLE
Published: January 2020

El aumento de los gases de efecto invernadero dan como resultado el cambio climático, siendo el dióxido de carbono uno de los que se produce en mayor cantidad. Los bosques juegan un papel primordial en el ciclo de carbono, ya que estos lo almacenan en la vegetación y lo fijan en el suelo. La preservación de los bosques, así como la fijación de carbono puede constituir valoraciones económicas ambientales a base de sistema de pago internacional. En el presente proyecto se calculó la biomasa y el carbono capturado de la reserva biológica Yanacocha con ayuda de una imagen satelital RadipEye del año 2010 proporcionada por el Ministerio de Agricultura, Ganadería, Acuacultura y Pesca (MAGAP) con una resolución de 5 m. Realizando una clasificación no supervisada, clasificación supervisada, cálculo del índice de vegetación de diferencia normalizada (NDVI), para obtener los lugares de muestreo y establecer parcelas para recolección de datos. Se usaron ecuaciones alométricas para cada tipo de bosque teniendo como resultado 10,88 tn/ha para bosque siempre verde montano y 24,4 tn/ha de bosque de Polylepis pauta. Se determinó la cantidad de carbono por cada tipo de bosque según el grupo Intergubernamental de expertos sobre el Cambio Climático (IPCC) consiguiendo 5,44 tnC/ha y 12,2 tnC/ha respectivamente. Se concluyó que el NDVI es un índice de vegetación valido para vegetaciones boscosas mas no para vegetaciones arbustivas pequeñas y de pajonal como se encontró en la zona de estudio, ya que estas daban como resultado un bajo nivel de vigorosidad de la vegetación.
ANÁLISIS DE LA POSICIÓN HORIZONTAL DEL SISTEMA GALILEO EN EL ECUADOR CONTINENTAL UTILIZANDO EL SOFTWARE RTKLIB
Authors: ENRÍQUEZ DENNYS , MORILLO ALFONSO
Published: January 2020

La navegación por satélite ha evolucionado de manera que se ha podido evidenciar un rápido crecimiento del Sistema de Navegación Global por Satélite (GNSS), que actualmente, está conformado por GPS, GLONASS, BeiDou, QZSS, IRNSS y Galileo. La ausencia de información del comportamiento de la constelación Galileo sobre el Ecuador continental muestra problemas, ya que no se ha identificado el error que presenta el sistema sobre la posición horizontal, esto implica el desconocimiento de las aplicaciones útiles para dicha constelación. Por lo tanto, el objetivo del presente proyecto es analizar la posición horizontal del Sistema Galileo, a partir del cálculo de la distancia entre coordenadas UTM obtenidas mediante el método PPP estático con soluciones semanales SIRGAS, para determinación del error en posición que presenta esta constelación en el Ecuador Continental. Para cumplir con esto, se rastreó la constelación mediante 3 Estaciones de Monitoreo Continuo del Ecuador pertenecientes a la REGME, enlazadas a la red SIRGAS-CON. Los datos obtenidos se procesaron en cuatro bloques con diferentes lapsos de tiempo con la técnica PPP estático en el software RTKLIB versión 2.4.2. Esto se realizó con intervalos de procesamiento de 1 y 30 segundos. Finalmente, se calculó la distancia horizontal con respecto a las soluciones semanales SIRGAS. Los resultados obtenidos, muestran que en los bloques 1 y 2 las estaciones EPEC, BHEC y CXEC presentan un error aproximado de 8, 2 y 1 metro respectivamente. El bloque 4, cuyos lapsos de tiempo están entre 1.5 y 24 horas, poseen un error por debajo de los decímetros. Como conclusión de este trabajo, se muestra que las estaciones BHEC y CXEC presentaron un error medio de 1.5 metros durante los primeros 30 minutos de rastreo, que es aplicable para diferentes actividades como la navegación o la georreferenciación de cartografía a escalas menores que 1:5000. Mientras que, la estación EPEC, presentó un error más alto que las otras dos estaciones, aproximadamente 8 metros durante los primeros minutos de rastreo, esto puede deberse a la ubicación geográfica, la geometría de los satélites, y a posibles pérdidas de señal.
DETECCIÓN DE CAMBIOS POR PARCELA PARA LA ACTUALIZACIÓN DE BBDD DE USOS DEL SUELO MEDIANTE IMÁGENES DE ALTA RESOLUCIÓN Y SENTINEL-2.
Authors: Andrade Sampedro Sergio Danilo
Published: January 2020

Uno de los elementos básicos para el análisis, gestión y planificación del territorio es contar con información actual y con ello de una buena cartografía de usos de suelo. Los procesos de actualización de bases de datos de usos del suelo suelen ser costosos por lo que las técnicas de observación remota de la Tierra sirven de ayuda. En el presente trabajo se pretende obtener mediante análisis multitemporal de imágenes SENTINEL-2 nivel 2A, correspondientes a los municipios de Torrente, Godelleta y Silla,  la obtención de variables temporales a partir de NDVI, SAVI, EVI, bandas 2, 3, 4 y 8  de 14 fechas del año  2016. La generación de variables temporales es realizada con la finalidad de aportar variables dinámicas a las variables extraídas de imágenes de alta resolución como lo son las ortofotos PNOA del 2008 - 2015 para clasificar el uso de suelo de mejor manera y con ello poder determinar parcelas catastrales con cambio en el uso de suelo con el fin de identificar de forma inmediata los sectores de mayor cambio en caso de que se desee actualizar la cartografía de manera convencional a través de fotointerpretación, de modo que este producto facilite y reduzca los tiempos de ejecución y mantenimiento respecto a la actualización de la base cartográfica.
Cardioneuroablation: Catheter Vagal Denervation as a New Therapy for Cardioinhibitory Syncope
Authors: Carlos Pachon Mateos José , I Pachón Mateos Enrique , Higuti Christian , Guilhermo Santillana Peña Tomas , Julio Lobo Tasso , Thiene Cunha Pachón Carlos , Carlos Pachón Mateos Juán , Carlos Zerpa Acosta Juán , Ortencio Felipe , Amarante Ricardo
Published: January 2020

The vasovagal syncope is the most frequent cause of transient loss of consciousness, especially in young people without significant heart disease. The malignant cardioinhibitory form is caused by abrupt and intense vagal reflex with or without defined triggers. Refractory cases to preventive measures and pharmacological handling has been treated with definitive pacemaker implantation. Besides showing questionable results, pacemaker implantation is highly rejected by young patients. In the late 1990s, we proposed specific vagal denervation by catheter ablation and spectral mapping, for paroxysmal AF, functional bradyarrhythmias and severe cases of malignant cardioinhibitory syncope giving rise to cardioneuroablation. Recently, many authors worldwide have been reproducing the cardioneuroablation results where elimination or significant reduction of the vagal response were observed, which abolished symptoms in more than 75% of patients followed up to 14 years, without complications. Therefore, cardioneuroablation has shown to be a real therapeutic option in malignant syncope cardioinhibitory and in any exclusive vagal mediated bradyarrhythmia without the need for pacemaker implantation.
Cardioneuroablação: A Denervação Vagal por Cateter Como Nova Terapia para Síncope Cardioinibitória
Authors: Carlos Pachon Mateos José , I Pachón Mateos Enrique , Higuti Christian , Guilhermo Santillana Peña Tomas , Julio Lobo Tasso , Thiene Cunha Pachón Carlos , Carlos Pachón Mateos Juán , Carlos Zerpa Acosta Juán , Ortencio Felipe , Amarante Ricardo
Published: January 2020

A síncope vasovagal é a causa mais frequente de perda transitória de consciência, especialmente em jovens sem doença cardíaca significativa. A forma cardioinibitória maligna é causada por reflexo vagal abrupto e intenso com ou sem gatilhos definidos. Casos refratários a medidas preventivas e manuseio farmacológico foram tratados com implante definitivo de marcapasso. Além de apresentar resultados questionáveis, o implante de marcapasso é altamente rejeitado por pacientes jovens. No final dos anos 1990, propusemos uma denervação vagal específica por ablação do cateter e mapeamento espectral para FA paroxística, bradiarritmias funcionais e casos graves de síncope cardioinibitória maligna dando origem à cardioneuroablação. Recentemente, muitos autores em todo o mundo vêm reproduzindo os resultados da cardioneuroablação, onde se observou eliminação ou redução significativa da resposta vagal, o que aboliu sintomas em mais de 75% dos pacientes acompanhados por até 14 anos, sem complicações. Portanto a cardioneuroablação tem se mostrado uma verdadeira opção terapêutica na síncope cardioinibitória maligna e em qualquer bradiarritmia vagal exclusiva mediada sem a necessidade de implante de marcapasso.
NEED ANALYSIS ON THE MATERIAL DEVELOPMENT OF TEACHING ESP SPEAKING
Authors: Lapele Fitria
Published: January 2020

University students must prepare themselves to be success in the global workforce. Hence, they should be able to speak English in the concerned fields of their specific major. In fact, speaking English for Specific Purpose (ESP) Students, especially students of non-English Language Education Department face some difficulties in constructing a good speaking. In this case, the ESP Speaking teacher should provide the good materials to help students master it easily. The teachers should consider using real life, authentic materials that reflect the target audience specialization. This study aimed to analyze the students’ needs on material development of ESP Speaking at University of Muhammadiyah Malang. It was intended to know the types of needs analysis conducted by the teachers for developing the materials. That is why; a narrative design was used to gather the research data. Besides, the instruments were interview guide and teachers’ documents. The result showed that: The teachers conducted four types of needs analysis for developing the materials, they areTarget Situation Analysis, Wants, Means, and Subjective Needs Analysis, Present Situation Analysis, and Lack Analysis. All the types the teachers have done in knowing students’ needs of ESP Speaking were generally in line with the requirements of good ways to develop ESP Speaking materials.