bluuebunny/crossref_metadata_2025_split huggingface dataset:
Integration of sequence stratigraphy, rock physics and AI inversion to determine the prospective reservoir in the shelf environment of the Tarakan Basin, Indonesia
Authors: Irsyad M , Tampubolon B T , Sukmono S 
Published: November 2021

Abstract
The Tarakan Basin is one hydrocarbon basin in Indonesia with approximately 40 discoveries and more than 1000 MBOE reserves. This study discusses an approach to integrate the sequence stratigraphy, rock physics and acoustic impedance (AI) inversion analysis to determine the prospective reservoirs in the basin. PRG-1 well data is used in the sequence stratigraphy and rock physic analysis. The sequence stratigraphy analysis of PRG-1 shows that there are three system tracts: transgressive, low stand tract and high stand system tracts. The integration of sequence stratigraphy, rock physics and log data analysis show that the prospective reservoir interval in PRG-1 well is located at a depth of 4730-4780 feet. It is characterized by low gamma ray, low NPHI, low density and high resistivity. The prospective interval was deposited in early Pliocene as Tarakan Formation in the low stand system tract of shelf depositional environment. The AI map shows that the distribution of the prospective is around the PRG-1 and in the eastern part of the area.
Unexpected Shallow Earthquake of August 1st, 2020 in the North of Indramayu, West Java, Indonesia
Authors: Murjaya Jaya , Supendi Pepen , Karnawati Dwikorita , Pramumijoyo Subagyo 
Published: November 2021

AbstractDuring the last one hundred years, there are no shallow seismicity in the north of Java. This area is dominated by intermediate and deep focus earthquakes due to the subducted Indo-Australian slab. An earthquake with magnitude ML4.5 struck Indramayu, north of West Java on August 1, 2020. According to the Agency for Meteorology, Climatology, and Geophysics (BMKG), the earthquake was felt III MMI scale in Indramayu and its vicinity. We used waveform data from BMKG seismic station in West Java, then we picked P-and S-waves arrival times from each station and hypocenter location was determined by Geiger method. We have detected Pn before Pg phase on four BMKG seismic stations, indicating a shallow crustal earthquake. Our inversion show that the earthquake occurred in 6.1805° S, 108.2612° E with 5 km focus depth at 16:24:38 GMT+7. Our focal mechanism solution was determined by using moment tensor inversion shows a strike-slip faulting, which corresponds to the active fault in the north of Indramayu.
Experimental Study of Flow Characteristics in A Rectangular Gravel Bed Channel
Authors: Tallar Robby Yussac , Ferninda Dea Teodora , Efferiki  , Anjar Suhendar Prabu Mandvi Hafiz , Purba Frankie Pandapotan 
Published: November 2021

Abstract
In an open channel flow, the characteristics of flow resistance are greatly affected by the roughness of the base and the walls of the channel. The existence of an object or other material, including gravel, also influenced the resistance of flow, therefore the purpose of this study is to examine the flow characteristics (flow velocity and flow resistance) in gravel open channel by using experimental study. A laboratory study to explore the effect of channel bed in terms of roughness of types of sediment on the hydraulics flow in 8 m length x 40 cm width a rectangular channel is presented. The study consists of an extensive set of rectangular flume experiments for flows with certain slope and sediment bed. The study was using the Before After Control Impact (BACI) method by set up five different scenarios. The results show that the lowest flow velocity (v=0.3041 m/sec) was occurred in the scenario 3 (50%sand and 50% gravel). Based on the Manning’ coefficient (n), it was also found that at the 100% discharge flow condition, the highest value of friction factor (f=0.0780) within 5 scenarios was scenario 3 with the sediment consisted of 50%sand and 50%gravel. Whereas the value of the lowest friction factor(f=0.0652) was scenario 1 with the sediment only gravel within. It concluded that the results gave the lower value of Manning’ coefficient (n) compared to the table of Manning’s coefficient (f= 0.04) for the channel with gravel base condition.
Gravity observation of field camp geophysics in Karangsambung using Data Acquisition 2005-2019
Authors: Wahyudi E J , Laesanpura A , Sukmayadi D 
Published: November 2021

Abstract
The study of field camp geophysics in Karangsambung has been done since 1996 until 2019 by geophysical engineering ITB. During the field activities, students was assigned with several data acquisition using various geophysical methods. One of the most common method to conducted alongside with surface geological mapping is gravity. Compilation of gravity data during the activities will be presented in this work. There are two categories of data compilation during 24 years: data compilation 1996-2004, and 2005-2019. The observation conducted using relative gravimeter with data distribution already cover geological surface map in the study area (Luk-Ulo Melange Complex, Karangsambung Formation, Totogan Formation, and Diabas Intrusion). The pattern of gravity observation shows correlated with topographic variation. Range gravity observation from this study is about 62 mGal.
Early Results of P Wave Regional Tomography Study at Sunda-Banda Arc using BMKG Seismic Network
Authors: Haq M S , Haolia  , Sulaiman M I , Madrinovella I , Satiawan S , Zaky D A , Suhardja S K , Ramdhan M , Priyono A , Widiyantoro S , Nugraha A M S 
Published: November 2021

Abstract
The plate movement, geological structure, magmatism, and seismic activity in the area of Bali to East Nusa Tenggara are mainly related with the subducting of Indo-Australian Plate underneath the Eurasian plate. The complexity is added with the recent collision of Australian continent lithosphere with the western Banda arc, along the islands of Flores, Sumba and Timor island. Our study area is known as the Sunda-Banda arc transition. With the aim of imaging subsurface structure, we perform seismic tomography inversion using regional events. We collected 5 years of earthquake data (January 2015 – December 2019) from the Indonesian Agency of Meteorology, Climatology, and Geophysics (BMKG). The output of our data processing is not limited to only P wave velocity model, but also relocated seismicity pattern in the region. In general, seismicity pattern shows dominant shallow events in the south that progressively shift into deeper events in the north down to a few 500 km, marking a dipping subduction zone in this region. A group of shallow events down to a depth of 50 km is also seen at the norther region that may relate to back-arc thrust activity. P wave tomogram model show a lower velocity perturbation at a depth of 30 km that could be associated with magmatic activity along the volcanic front line. Higher P wave perturbation model are spotted at two different zones, the first one is marking a dipping Indo-Australian plate down to depth of 400 km. We noticed that the angle of dipping is steeper in the Eastern part compared to the Western part. The second a relatively flat at shallow depth at the northern region from the island of Lombok to Nusa Tenggara Timur that may mark the back-arc thrust region
Study of Fluid Flow Movement by Using Self Potential Data
Authors: Jubaedah Neng E. , Parnadi Wahyudi W. 
Published: November 2021

Abstract
The Self-Potential (SP) method is passive method in geophysics which works based on the natural presence of an electric field on the surface due to anomalies below the surface. SP value on surface can be generated by fluid flow through rock pores or fractures. We study fluid flow movement in subsurface using the velocity value of fluid flow derived from SP values measured on surface. For that purpose, we carried out mathematical modelling, connecting the Helmholtz-Smoluchovsky’s electrokinetic potential gradient equation with Darcy’s law. The velocity of fluid flow depends on the intrinsic permeability of rocks, electrokinetic potential gradient and electrohydrolic conductivity constant. We tested derived velocity of fluid flow on the SP data from a pilot project test site. Study results show that fluid flow in vertical direction can be identified from SP data at locations where there are significant changes of positive and negative SP values. Fluid flows from a high SP value to a low SP value and this flow is opposite the positive SP gradient. The SP value at study site lie in the range -80mV to -160mV, whereas the value of the water flow velocity lie in the range 0.08 cm/s - 0.21 cm/s.
Comparison of Airborne Electromagnetic and Ground-based Resistivity Observations: Case Study Banda Aceh Basin
Authors: Irwandi I , Syafrizal  , Rifqan  , Naufal H. , Siemon B. 
Published: November 2021

Abstract
Airborne measurements are very useful to cover very large areas. Nine month after the Aceh Tsunami and Earthquake in 2004, BGR (Federal Institute for Geoscience and Natural Resources) conducted a fresh water supply exploration survey within a project called Helicopter Project Aceh (HELP ACEH). The helicopter-borne electromagnetic (HEM) device operates at five frequencies. The HEM can estimate the 1D resistivity models down to a depth of 150 m for the high electrical resistivity areas and 50 m for low electrical resistivity areas. In this paper, the airborne data of 2005 are compared with resistivity data acquired in Banda Aceh basin in 2018. The HEM output consists of 1D resistivity models derived by inversion of the processed data. These 1D resistivity models are compared with the 2D resistivity models derived from ground-based resistivity measurements. However, the 2D models on the ground are transformed into 1D resistivity models so it can be used for comparison. The transformation is conducted by averaging the resistivity values in the each layer, so every layer only has one resistivity value. Both methods are influenced by many factors. For example, resistivity on the ground is affected by local conditions. The airborne measurements are also influenced by objects that are at the surface of the ground. In some cases, the airborne resistivity models have some differences in absolute resistivity values, but they often have the same structural pattern compared with the ground-based resistivity models.
Institutional model for ecotourism development in the Gunung Pongkor post-mining area
Authors: Kusumoarto A , Gunawan A , Machfud  , Hikmat A 
Published: November 2021

Abstract
The Gunung Pongkor post-mining area has some resources potential for ecotourism destination. The development of area’s ecosystem in the Gunung Pongkor post-mining area needs to protect the ecosystem and prevent activities that do damage within the area. In this case, it is necessary to make institutional model for ecotourism development in the Gunung Pongkor post-mining area. The objectives of this study are 1) to identify the elements in the development structure variable; 2) to analyze objective variables, needs variables, constraint variables, and actor variables; 3) to create institutional model for ecotourism development in the Gunung Pongkor post-mining area. This study uses descriptive qualitative methods with Interpretive Structural Modelling (ISM) analysis. The elements analyzed are 1) the objectives to be achieved in the development of the ecotourism areas, 2) the needs in the development of the ecotourism areas, 3) the obstacles that need to be overcome, and 4) the actors who play a role in the development of the ecotourism areas. The key element of the goal for ecotourism development in the Gunung Pongkor post-mining area is to provide education to the local community about environmental management and culture. In the development process, a master plan and legality of the area as ecotourism are needed. Some of the main obstacles in the development of this area are the absence of a change in the status of a forest area to an ecotourism area and a lack of knowledge about the conservation of natural resources and the environment. The key actors needed in developing this area are Regional Planning, Research, and Development Agency of Bogor Regency Regional Government, Tourism and Culture Office of Bogor Regency Regional Government, Environmental Office of Bogor Regency Regional Government. The diversity of the existing potential is utilized to the fullest it resolves problem that occur in this area in achieving an ecotourism area based on landscape characters in the Gunung Pongkor post-mining through collaborative ecotourism development.
Waterbirds roosting on gas drilling platforms in Mahakam Delta, East Kalimantan: the Unexpected Impact of Landscape Transformation
Authors: Mardiastuti A , Mulyani Y A , Sutrisna T , Hidayat Y , Widodo A S , Agustin I A R , Santosa E 
Published: November 2021

Abstract
Since 2014 some offshore gas platforms operated by Pertamina Hulu Mahakam near Mahakam Delta has been used by hundreds of egrets as roosting sites, causing nuisance to the platform and hampering the duty of workers/operator. The objective of this paper was to analyse the situation of the waterbirds’ nuisance, analyse the possible causes, and provide some recommendations. Field visits were conducted in August 2019 and February 2020 to three unmanned platforms (Ax, D, C) that suffered the most from the bird roost. Birds that infested the platforms were identified as great egret and intermediate egret, both are very similar in appearance and ecological requirements. The maximum number of egrets visiting C-Platform (the worst platforms) was 671 birds. These birds roost at night in the platform and leave the platform in the morning to forage for fish, eel, and shrimps in the wetlands of Mahakam Delta, about 2-4 km from the platform. The root cause of the infestation was believed to be the landscape transformation in the Mahakam Delta. Mangrove forest has been diminished and heavily converted into shrimp-ponds. The egrets’ foraging areas became ubiquitous, while the roosting/nesting site greatly decreased, forcing the egrets to roost on gas platforms. In the short-medium term, platforms need to be managed as bird tolerated-zone and bird-free zone (using deterrent), while in the long term, land-use in Delta Mahakam need to be restored.
Developing green tourism to create the sustainable landscape: evidence from Community-based Coffee Tourism (CbCT) in Puncak, Bogor, Indonesia
Authors: Prihayati Y , Veriasa T O 
Published: November 2021

Abstract
Indonesia went through 3.5% growth in 2019, over the last five years in the travel and tourism sector, while the global economy increased by 2.5%. Currently, this condition encourages the creation of new jobs. Surprisingly, nowadays, there is increasing awareness of people contributing to the triple bottom line of sustainable development through initiating green tourism. Community-based Coffee Tourism (CbCT) has been running in the Puncak area for about five past years as green tourism has drawn people to come. Over time there are some significant changes in an area relating to several aspects of the three bottom line of sustainability. Through this study, we are going to 1) identify the impact of green tourism on the environment/landscape through the ecological approaches using the Social Ecological System (SES) framework and 2) to identify the contribution green tourism to the local economy using the Basic Income analysis and Benefit and Cost analysis methods. Based on the SES framework, the results show that there are some aspects from the SES framework that will be effective in the context of the case study, if there is a combination between the conservation activities and economics, which gives a direct impact on the local income. This study indicated that green tourism through CbCT has contributed to the increasing individual community income from 13.19% or IDR 2,375,000/year/person to 76% or IDR 13,680,000/year/person. Based on B/C ratio analysis, it shows that green tourism is financially reliable to be developed at 5% and 10% of growth level, even at zero growth of the business. Hence, CbCT should be continuously developed as green tourism practices that contribute significantly to the community’s income and ecological improvement to support a sustainable landscape management strategy.
Re-designing of the bottleneck on Suryanata Street Samarinda City East Kalimantan
Authors: Raharjo E P , Rahayu A M , Hartini V O 
Published: November 2021

Abstract
Some indicators of traffic problems like congestion, pollution and accident become the benchmark to evaluate the infrastructure performance. One kind of problem that often happened are the Bottleneck problems. In this kind of condition, the capacity of one side of the road is lower than before condition. On the other hand, in the process of landscape design of bottleneck deciding only by the availability of the space and those kinds of condition are not getting research by some specialist. The purpose of this research is to analyze the design parameter to enhance the capacity so case we can decreasing the number of congestion in a significant way. This research has taken place in Suryanata Street, Samarinda City. This research uses the model of Greenshield Linear, Greenberg Logarithmic, and Exponential Underwood to state the relationship between the performance of Traffic, Volume, Speed, and Density so we can decide the best model to analyze the shock wave that is using to design the parameter that effecting the design of bottleneck road area. Meanwhile, the pollution that can identify it consist of: CO (in the part of Per Million / PMM), NOX (calculate in Cubic meter / M3) and level of smoke (calculate in Cubic Meter / M3) with using the model of Hobbs (1979). Re-designing will be implemented to get the optimal performance infrastructure in the research location, and evaluate those kinds of terms. The result of the research got three design parameters in the Bottleneck area. There are track width, length of the road, and traffic volume. From the result analysis, the researcher is doing the Re-designing in the bottleneck area of the research location by using the parameter performance of congestion, specifically on delayed and pollution, like CO, NOX and level of smoke. Based on the re-designing, we can be decreasing the delay in the amount of 29.31% decreasing the number of NOX by 25.03% on CO we can be decreasing in the amount of 14.88% and also decreasing the level of smoke by 11.94%.
Analysis of ecological and visual quality impact on urban community activities in Bogor City
Authors: Anwar S , Kaswanto R L 
Published: November 2021

Abstract
Bogor City’s implication as a satellite city is directly related to carrying capacity and its influence on environmental quality, specifically ecological and visual quality. Urban communities naturally tend to properly utilize open space in their daily activities, such as in urban park along Ciliwung River riparian. Psychologically, the individual’s environmental situation has more role in influencing a person’s actions than the individual’s characteristics. Therefore, as a socio-cultural function, public space can reflect people’s lives in the city. This study analyses the ecological and visual quality impact on park visitors’ activity in Bogor City to determine that environmental factors can influence community activities. Sempur Park has the highest visual quality value according to respondents’ perceptions. This result is the same as the result of ecological quality that places Sempur Park as the highest diversity index. The high value for these two qualities is in line with the increased activity carried out in the park, which is 41 activities. As a result, the connection between ecological and visual quality shows a strong and positive correlation with the urban park’s amount of activity. This study’s output is recommendations for managing the urban park landscape to increase the level of activities by improving the urban park’s visual and ecological quality.
Local community’s role in tourism development
Authors: Andreyanova E L 
Published: November 2021

AbstractThe transformation of rural economy is most acute at the local level among the native population. The goal of the article is to define possibilities for participation of local community in development of rural tourism. When applying the participatory approach, the following conclusions can be drawn: 1) when local communities are not actively involved in the development of rural areas and tourism within the local borders, it is almost impossible to speak of any promotion; 2) rural tourism is attractive to the local community, but its ability actively participate in its development is limited by objective and subjective reasons; 3) emphasis on the benefits of rural tourism for the consumers and producers can lead to increased employment and profits for the local community. The assessment of the local community’s capacity to develop rural tourism is a crucial point in its promotion. This in turn leads to further research into the experience of integrating rural tourism into local communities. The results of the article may help in the development of concept papers on rural tourism development and may be useful in some tourism projects.
Transport corridors as a factor of urbanization processes in the regions of Russia within the framework of the new Great Tea Route
Authors: Yu Loseva A , Sanzheev E D 
Published: November 2021

Abstract
The article considers the development of urbanization in the regions of Russia through the formation of transport corridors. The authors analysed the urbanization processes and their features in three regions of Russia: Trans-Baikal Territory, the Republic of Buryatia, and the Irkutsk region. Transport corridors will continue to develop within the framework of the regional policy of Russia and China. The authors also evaluated the foreign economic activity with Mongolia and China. The study highlights the key role of regional centres in the development of foreign economic cooperation. The evolution of urbanization processes in these regions requires the creation of a regulatory complex, which will allow streamlining these processes. It is necessary to use the opportunities for further development of regional cities through the formation of international transport corridors.
Water use in border regions of Russia and Mongolia: Environmental and economic aspects
Authors: Ts-D Zhamyanov D , Doinikova E E , Banzaraktcaev Z E 
Published: November 2021

Abstract
In this article we analysed the characteristics of water use in the border areas of Russia and Mongolia. Data on water use in these border areas are presented. The features of ecological and economic situation from water use were considered, which show how water resources are underestimated.
Tyva: A Peripheral Fate? (a historical and geographical sketch of the formation of the population of the Tyva Republic – from the Huns to its voluntary incorporation into the RSFSR in 1944)
Authors: Mandyt M K-O , Gonchikov Ts D , Gomboev B O , Bolkhosoeva E B , Urbanova Ch B , Kovaleva N M 
Published: November 2021

Abstract
The historical roots and geographical features of the population’ formation in the Tyva Republic during the period from the Hunnu domination to the voluntary incorporation of Tyva into the Russian Soviet Federated Socialist Republic (RSFSR) in 1944 have been studied. The formation of the population occurred in conditions of peripherality of the considered object in relation to the state entities, which it was a part of or was under their influence in different periods of its development. The formation of the Tuvan ethnos was completed during the period when the Tyva tribes were part of Manchurian China in the late 18th-19th centuries. An important factor in this process was the establishment of an administrative division based not on clan but on a territorial principle. The economic and geographical position of the region, as one of the determinants of the socio-economic development of Tyva and the further formation of its population, was and still is unfavourable, which predetermines the search for foundations for the spatial development of the republic.