bluuebunny/crossref_metadata_2025_split huggingface dataset:
Environmental management in Citarum Watershed inter-institutional cooperation approach
Authors: Brotosusilo A , Budidarmono  , Utari D , Handayani R D 
Published: August 2019

Abstract
Some environmental issues in Indonesia are remaining problems that cannot be resolved. One among the environmental concern is a growing interest in the Watershed (DAS) area management. Various attempts had been made to manage the areas but has not resulted in optimal outcomes so far. The aim of this study is to determine the implementation of environmental management in Indonesia, especially in Citarum Watershed area. Through this research, it is expected in the future inadequate supervisory system that had been developed within the community can be converted into better management, such as integrated management of watersheds with the culture of everyday life. This research uses a mixed method approach consist of quantitative and qualitative analysis. The data is obtained from the modification approach of previous research on Kutai National Park combined with an interview with experts from government and academics. Furthermore, the data is analyzed using AHP (Analytical Hierarchy Process) and ANP (Analytical Network Process) Superdecision software Ver. 2.6. The study resulted that the strategy of environmental management should be changed into civil-military based management. To be able to map out a strategized effort the military involvement is required at the stage of planning, implementation, coordination, and supervision.
Correlation between gravity and magnetic data and its impact for geological structural phenomena in Kuningan, West Java, Indonesia
Authors: Nur A A , Harja A , Supriyana E , Nugraha G U 
Published: August 2019

Abstract
Kuningan district is located in the eastern part of west java province. It has uniquely geological feature. In the western part of this district is dominated by volcanic products from the eruption of mount ciremai, while in the eastern part it is dominated by tertiary rocks formation. Geophysical investigations have been conducted to identify subsurface phenomena in eastern part of Kuningan i.e. Lebakwangi sub-district. The results showed that the fault zone has a magnetic anomaly value and bouguer anomalies are inversely proportional, the higher the magnetic value the lower the bouguer anomaly value. faults have a tendency towards the northwest - southeast. The study area tends to be covered by the young volcanic deposits of mount ciremai eruption that overlay the tertiary rocks beneath it so that the existence of the faults tends to be disguised. The inverse geophysical data has an impact on the interpretation of the existing fault structure at the study area where the hangging wall footwall tend to be disguised. Need further geological and geophysical research to further identify the presence of faults in this study area.
Microearthquake relocation hypocenter using Modified Joint Hypocenter Determination (MJHD) method. (case study: Opak fault)
Authors: Zahwa F , Fattah EI , Hasanah M U , Wijatmoko B 
Published: August 2019

Abstract
Earthquakes with small magnitude and shallow depths are one form of manifestation of existence a fault line in Yogyakarta. Accurate hypocenter determination is needed to identify tectonic and fault conditions based on earthquake hypocenter distribution recorded by seismograf. Hypocenter was determined by using two methods Geiger’s Adaptive Damping for early hypocenter and Modified Joint Hypocenter Determination (MJHD) for relocate hypocenter, we used 2 weeks aftershock data after main quake occurred on June 10-14 2006 with total of 625 events earthquake obtained from the results of picking waves. The difference of hyposenter result on the longitude and latitude is about 2 -25 km and depth change around 0.3-5 km with major distribution to the east from the fault. The final result of this relocation shows that the area is more easily releases energy is in the eastern section of the fault consisting of sedimentary rocks.
Gravity data of porong regions, sidoarjo in the interpretation geology structure and deformation of the subsurface
Authors: Supriyana Eddy , Padmawidjaja Tatang 
Published: August 2019

Abstract
Patterns of regional geological structure Sidoarjo has performed detailed interpretation of gravity data is is controlled by the data of surface deformation via GPS. Indication of field data is not obtained a description pattern shallow geological structure being covered by sediment aluviumnya. Gas effuent or subsidence in the Siringbarat and Tanggulangin area is field evidence as controls in the estimation of interpretation of gravity changes and pattern density shallow geological structure. Regional and detailed gravity data interpreted that as an anomaly patterns are trending fault structures with the location of the gas effluent south southwest - north northeast. South trending regional fault structure of the southwest - north north-east to the surface to form a continuous fracture and amblasan as a medium in which the effluent gas is formed. Negative changes in the value of gravity is interpreted as a weak zone or zones shown as mass loss as subsidence located in Siringbarat and Tanggulangin. While positive changes in microgravity, as the removal of the zone located in the southern part of the Sidoarjo Mud pond.
Land cover modelling of Pelabuhanratu City in 2032 using celullar automata-markov chain method
Authors: Akbar Fadhli , Supriatna  
Published: August 2019

Abstract
Pelabuhanratu located in strategic coastal area, make it as the Centre of Growth in Sukabumi District. In this regard, landcover changes continue to occur and could trigger unsustainable environmental. The purpose of this study is to analysis the land cover change of Pelabuhanratu city until 2032. The Cellular Automata-Markov is used to identify the spatial growth, several factors that encourage the landcover change used as an input. The driving factor was build based on fuzzy logic, the variables are proximity to road, proximity to river, proximity to coastline proximity to point of interest, elevation, slope and landcover. Then, suitability area for built up area as input for Cellular Automata-Markov tools. Landcover was obtained from google earth in 2002, 2010 and 2017 then used as the basis for model calculation. The prediction result shows that land cover change in Pelabuhanratu city is very significant with the Kappa Standard level reach 91% accuracy. Built up area has extended from the previous condition that coming from agricultural area. Moreover, the area growth with linear pattern at south area, spread pattern at north area and crowded at west area.
Value-chain distribution of seaweed production in Amal Coast, Tarakan Island
Authors: Wahyularassati Annisa , Susiloningtyas Dewi , Handayani Tuty 
Published: August 2019

Abstract
Seaweed has high economic potential which is can give a hope for coastal societies to improve their living standards. Since 2009, In Tarakan island, North Kalimantan especially In Amal’s Coast, the local communities started to developing seaweed cultivation and now seaweeds become one of Tarakan’s main commodity beside fish, shrimps and crabs. This study aims to analysis seaweed’s value chain distribution in Amal Coast, Tarakan. Data collection method is interview directly to farmers, collector traders and other marketing agents by using snowball sampling. The marketing Chains occurred trough 2 Value Chains Channel and the farmers get less profits than the factories or exporter. Therefore, it is indeed needs to improve the value chain distribution of seaweeds in Amal coast.
Model of regional vulnerability against CO2Toxic Gas disasters at Mount Dieng (case study: Timbang Crater, Batur Sub-District, Banjarnegara District)
Authors: Syafrudin Rizqi , Tambunan Mangapul P , Supriatna  
Published: August 2019

Abstract
One of the sub-districts that are vulnerable to toxic gas disasters is Batur Subdistrict, Banjarnegara District.For that people living in the vicinity of the crater should always be ready for the national disaster of toxic gas that had killed 149 people on February 20, 1979 did not happen again.The purpose of this research is to make the model of vulnerability of area to toxic gas disasters of CO2 Timbang crater in Batur Sub-District by using Analytical Hierarchy Process (AHP).The population in this study is the entire head of the family located in Batur Sub-District, Banjarnegara District, Central Java Province, amounting to 37 heads of household.To take the sample used Simple Random Sampling method.Data analysis techniques through weighting of the three aspects are exposure, sensitivity, and adaptive capacity.In each aspect the parameters are weighted using input from the experts by the AHP method.The vulnerability of the area to the toxic gas catastrophic CO2 is classified into three levels of vulnerability are, low, medium, and high. Based on the research result, the vulnerability level in Batur sub-district is only divided into two classes, namely for the vulnerability class being found in 6 villages are, Pekasiran Village, Pesurenan, Sumberejo, Karang Tengah, Bakal, and Dieng Kulon. For the high grade, there are 2 villages: Batur, and Kepakisan. This happens because the level of exposure and sensitivity is much higher than the adaptive capacity of the community.
Elastic Property Modeling Related to Pore Type Analysis in Carbonate Reservoir
Authors: Dewa Made Raditya Margenta I , Winardhi Sonny 
Published: August 2019

Abstract
The reservoir has a significant role as a place of hydrocarbon accumulation in a petroleum system. Therefore, during exploration, a good understanding of the reservoir characterization becomes important to recognize the hydrocarbon migration path. There are several types of reservoirs which are commonly found; one of them renowned as carbonate reservoir. This type of reservoir is hard to be understood due to the heterogeneity of its pore type as a result of intense cementation and diagenesis. Information of pore type can be obtained based on core analysis or rock physics analysis. There are some rock physics approaches commonly used such as Kuster-Toksöz, Self Consistent Approximation (SCA), and Differential Effective Moduli (DEM). On the other hand, there are also other approaches but less famous. Parameters such as spherical porosity(ɸS
), pore shape parameters –pore shape factor (S) and relative pore shape factor(ΔS) – are sensitive to identify pore type which may be developed in a carbonate reservoir. A positive value of ɸS
and ΔS is the characteristic of carbonate rocks with the domination of stiff pore (high aspect ratio). These characteristics also can be informed by a value of S > 1. On the opposite, a negative value of ɸS
and ΔS is the characteristics of carbonate rocks dominated by soft pore (low aspect ratio) that also can be informed by a value of S < 1. These parameters offer a simpler approach about pore type analysis and easier compared to Kuster-Toksöz in rock physics modeling. This research will use synthetic data to comprehend each parameters and real data to validate a hypothesis based on synthetic data. The results obtained in this study can be used as a first step to do seismic inversion based on the elastic property which is sensitive enough for this condition.
Geotechnical Investigation Using Surface Waves Method: A Case Study of Sabet Bridge, Lamno, Aceh Province, Indonesia
Authors: Jamaluddin Khaizal , Nawawi Mohd , Rusydy Ibnu , Irwandi Irwandi , Chairullah Banta 
Published: August 2019

Abstract
Sabet bridge is a connecting bridge between Lamno town and Jantho town in Aceh Province. The bridge is located in a mountainous area and geologically near to a karst formation. The surface is covered by a fluvial landscape which was deposited by coarse sand, gravels, pebbles, and boulders. The bridge foundation analysis consists of four points cone penetration test which capable to penetrate up to 2 meters. One borehole has an obstacle in penetrating due to gravel, pebble and boulder layers; which consume more drilling time and expensive. To solve this problem, a seismic surface waves method has been performed. Two seismic lines run above the planned site of bridge abutment. The investigation reveal the results, that the surface waves method can penetrate into subsurface more than 30 meters in depth; in which the requirement depth only 30 meters. The results from surface waves method reveal the suitability and high similarity with cone penetration test and borehole investigation methods.
Realistic Shakemap M6.5 Pidie Jaya Earthquake 7 December 2016 Based on Modal Summation Technique
Authors: Irwandi Irwandi , Indris Yunita , Muksin  , Jamaluddin Khaizal , Zulfakriza  , Joni  , Muzli  
Published: August 2019

Abstract
The shakemap were usually generated based on strong ground motion calculations on attenuation equations of the Ground Motion Prediction Equation (GMPE). However, the GMPE is a general equation which does not take into account the structural model of each layer of the subsurface. It considers only the structure of the surface layer known as Vs30 calculated as amplification in shakemap calculation. In this paper, the realistic calculation of shakemap for Pidie Jaya earthquake of 7 December 2016 with magnitude M6.5 is performed. Shakemap is generated from a number of synthetics seismogram calculations from source to site-based capital calculation summation Technique. Neo Deterministic Seismic Hazard Analysis (NDSHA) has included in the calculation of the synthetics seismograph. Before engaging the Vs30 effect, the realistic shakemap capable of producing effects of the angular distribution of a double-couple model in a realistic calculation. This could give an advantage of realistic shakemap while the GMPE based shakemap had not taken into account the double couple model. The realistic calculation of modal summation technique for shakemap can be further developed by involving local structural models in a more comprehensive manner.
Rock Physics Template Application on Carbonate Reservoir
Authors: Hilman Judy , Sonny Winardhi Ignatius 
Published: August 2019

Abstract
A good characterization of a reservoir is required to understand its properties. One of the methods known is Rock Physics Template (RPT). This method attempts to characterize a reservoir in order to predict the behavior of the reservoir under different porosities and water saturation. However, most of RPT technique applications are limited to granular rocks and not for carbonates. Although carbonates generally suitable as reservoir rocks, it is proven to be more challenging. The complex system of carbonates porosities often gives scatter pattern on the correlation between porosity and P-wave. Therefore, this research attempt to use RPT to model carbonate reservoir. We use Kuster Toksoz as the basis for carbonate rock modeling with the help of the Biot-Gassmann equation. The target of this paper is the Baturaja formation that is located in South Sumatra Basin. This formation is known to be a carbonate reservoir that has produced gas hydrocarbon. This study offers an approach on how to better understand the application of RPT on carbonate formation. Based on the RPT modeling done in this research, specific parameters need to be obtained in order to develop a functional RPT model. These parameters are the aspect ratio of the porosities and the elastic modulus of the minerals.
Preliminary Result of Hypocenter Relocation Using Double Difference Method along Sumatran Fault, Indonesia
Authors: Surya Putra Ade , Dian Nugraha Andri , Puspito Nanang T , Triyoso Wahyu 
Published: August 2019

AbstractThe Sumatran fault zone has a high seismicity and seismic hazard threat levels due to this fracture through densely populated areas. The fault zone of Sumatera has 19 main segments which each segment has the possibility to generate a strong earthquake. Therefore, in this study we attempt to improve the accuracy of hypocenter locations which is needed as basic analysis in advance seismology and in seismic hazard analysis. The final objective of this study is to analyze the subsurface seismic velocity structure of the Sumatran fault by applying seismic tomography method. For the preliminary result, we have been conducting double-difference method to relocate 967 events recorded by 49 stations compiled by Meteorological, Climatological, and Geophysical Agency of Indonesia (MCGA) from 2009 to 2017 along Sumatran fault. Our preliminary results from the relocation proces indicate prominent features of event cluster around Sumatra fault system. The next step, we will improve the onset of P-and S-wave arrival time by using waveform cross-correlation in order to get more reliable hypocenter location.
Depth Migration Velocity: Differential Semblance Analysis for Sumatra Forearch Basin
Authors: Putra A. S. , Sismanto  , Alam I. S. 
Published: August 2019

Abstract
The specific goal of this work is to present a complete velocity map obtained by picking the velocity in Common Image Gather (CIG) map. We simulated a shot gather in order to obtain a synthetic travel time data for depth analysis. We successfully determined the correct migration velocity and presented the velocity interval model. For further study, we also conducted a Semblance analysis in order to obtain a coherency panel between the energy and the depth migration velocity analysis. We successfully interpreted the conventional semblance profile that the correct velocity model maximizes that energy which is represent higher value. For the real case, The data set was acquired by CGGVeritas in 2009 of RMS velocities recorded in 48 CMP points. The results of the semblance analysis shows well coherence with the seismic reflectance data that reveals the Low Velocity Zone of Sumatra fault related to the present of fluid and gas.
Production and Reinjection Evaluation on The Basis of 3D Time-lapse Microgravity Inversion
Authors: Haq F D , Sastranegara T , Agung L , Kusuma A D , Hendriansyah T , Fanani A F , Raharjo I B 
Published: August 2019

Abstract
An equilibrium in the geothermal is important especially in terms of reservoir sustainability. Fluid in the reservoir will continue to decrease if the reinjection activity unable to compensate the steam production. Field “US” is one of the geothermal field that has more than 5 Megaton production rate. The fluid depletion should be controlled so the reservoir is able to continue to supply the steam. Re-injection strategy plays an important role to keep up with the amount of fluid that comes out. Preparation of this strategy requires 4D microgravity or time lapse microgravity method to know which area has the most fluid depletion. The use of microgravity for monitoring has become the ultimate method in geothermal. In this paper, we will discussed on how advanced microgravity processing able to be a consideration in the production and re-injection strategy. The data used in this paper is microgravity survey which conducted every year from 2015 - 2017. Further processing such as inverse modelling is also used in this paper to estimate the mass changes inside the area of interest. In the modelling, we used staggered grids as an initial model to produce more suitable final model. Initial models are made based on geophysical research data such as Magnetotelluric resistivity data and hypocenter from Micro-earthquake so the position of the top reservoir can be determined. The Gauss’s Flux method also used in this paper to be compared with the result from inversion. The result of this research is to maintain the sustainability of reservoir in geothermal energy by make re-injection plans more effective and precise.
Binary Coded Genetic Algorithm (BCGA) with Multi-Point Cross-Over for Magnetotelluric (MT) 1D Data Inversion
Authors: Wijanarko E , Grandis H 
Published: August 2019

Abstract
The magnetotelluric (MT) 1D modelling has been continuously receiving interest due to its effectiveness in obtaining overall subsurface resistivity image of an investigated area. The advances in computational resources allow increasing implementations of non-linear inversion using global search approach, such as Genetic Algorithm (GA). The genetic algorithm adopts the process of natural selection (survival for the fittest) and genetic transformation, i.e. selection, reproduction, mutation and population change, to solve the optimization problem. This paper discusses GA application in MT 1D modelling using binary coding representation with multi-point cross-over, i.e. one for every model parameter. The model parameters are resistivity and thickness of homogenously horizontal layers. The algorithm parameters need to be set to work properly, i.e. population size, number of genes, number of bits, crossover probability, mutation probability and number of generations. Despite binary coded GA (BCGA) drawbacks discussed in the literatures, we found that binary representation allows relatively extensive exploration of the search space. Test using synthetic data from three-layered synthetic models lead to satisfactory results, in terms of synthetic model recovery and data misfit comparable with the noise level contained the synthetic data.
Full Waveform Modelling for Subsurface Characterization with Converted-Wave Seismic Reflection: Residual PP Removal on PS Component Using F-K Filter
Authors: Viony N C , Triyoso W 
Published: August 2019

Abstract
The application of converted-wave seismic method in hydrocarbon exploration has increased significantly. Since the conventional seismic ceases to provide an adequate image in complex geology area and it often provides an ambiguous bright spot response. The main principle is that an incident P-wave produces reflected and converted P and SV wave on an interface. Converted-wave seismic uses the multicomponent receiver that records both of vertical component and horizontal component. The vertical component is assumed to correspond to the compressional PP wave and the horizontal correspond to the PS converted-wave. In this and previous research (Viony and Triyoso, 2018), a synthetic seismic data with the shallow gas and the salt dome model are constructed by the full-waveform modelling. The purpose of this study is to improve the imaging quality on the PS section and the PS AVO curve due to the existence of the residual PP events on the horizontal data in the previous study (Viony and Triyoso, 2018). The PS gather has been NMO corrected by the PP velocity. Therefore, the residual PP reflections are well-corrected and the PS reflections are under-corrected. To obtain the more reliable PS data, the residual PP reflections have been removed by rejecting the well-corrected data in f-k filtering process. The results of this study present that the imaging quality and the AVO of the filtered PS is better and more reliable than the un-filtered PS in the previous study (Viony and Triyoso, 2018).