bluuebunny/crossref_metadata_2025_split huggingface dataset:
The Application of Electrical Resistivity Tomography using Wenner-Schlumberger Arrays Configuration to Identify the Geological Structure in Kancah Warm Spring, West Java Indonesia
Authors: Tongkeles Patriks Vero , Suryantini  , Pratama Angga Bakti 
Published: July 2022

Abstract
Kancah warm spring is located in the southern part of Tangkuban Perahu Volcano, in West Java Indonesia. This warm spring has a temperature 470 C and a pH of 3 and it is used as a source of water for nearby tourist attractions. This warm spring has a large discharge, with the source thought to be from subsurface water associated with Tangkuban Perahu Volcanic complex. Knowing the source and geological control of this warm spring is one way to further identify the Tangkuban Perahu geothermal system, especially its permeability. For that reason, this research aims to using Electrical Resistivity Tomography (ERT) method to identify the geological structure that controls the appearance of geothermal manifestation using the resistivity method with Wenner – Schlumberger arrays configuration. The study starts with lineament study using DEM to identify the structure in surface and then determine the geometry of subsurface geological structures are using the electrical resistivity tomography (ERT) method using the Wenner - Schlumberger configuration. with a length 320 meters of each line and the electrode spacing is 10 m. The results of the interpretation of satellite images show that there is a lineament which is interpreted as a fault structure with a NE-SW direction that is right at the location of the discharge of the warm spring. There are 3 - 4 faults identified in each profile, some of the faults identified beneath the Kancah spring and may controlled the warm spring. These faults are a permeable that flows hydrothermal fluids from the subsurface to the surface in the form of warm spring..The lithology beneath of Kancah warm spring are dominated by breccia pyroclastics, clays, and a small amount of andesite igneous rocks.
The Significances of Cretaceous Petrified Wood Fossils from Padangcermin, Lampung in Paleoenvironmental Perspectives
Authors: Harbowo D G , Nahar R N F A , Sari D , Julian T , Kuswara T A , Abimayu R A , Lajona R A , Huzaifah S 
Published: July 2022

Abstract
Reports on the presences of petrified wood fossils in Padangcermin, Lampung, are rare, no strong examination that expose the scientific concern on its paleoenvironment perspective. By the published geological map, these fossils was found in the area that labelled as Cretaceous sedimentary rock (145-66 mya). Recently, the known oldest petrified wood fossil in Indonesia, is from Miocene epoch (23.03-5.33 mya). It is an interesting circumstance to examine. By this study, we are trying to confirm this circumstances by conducting the geological mapping, collecting, and identifying the petrified wood fossils that could be found as in situ fossils in the area. This study reveals a new update in paleoenvironmental perspective. The petrified woods in this area are commonly preserved in cherty layer. There are also several fossilized aquatic freshwater plant remains that presences in this area. We suggest the fossilization of the petrified wood fossil in this area is related to high alkaline-freshwater lacustrine. Supposedly, it associated with the Cretaceous terrestrial landmass and freshwater lacustrine environment in southern paleo-Sumatra by paleontological interpretation of data in this study.
Mapping the distribution of natural ecosystems on peatlands through vegetation using the object-based image analysis (obia) method in bangko district, rokan hilir regency, riau.
Authors: Roganda M.S. , Murti Sigit Heru , Widyatmanti Wirastuti 
Published: July 2022

Abstract
Expansion of the use of natural ecosystems on peatlands is increasing rapidly in Bangko District, Rokan Hilir Regency, Riau. This utilization tends to cause damage to the natural ecosystem of peatlands which has a major impact on the local environment (in situ) and the surrounding environment (ex situ), so a mapping is needed to detect the presence and ensure the distribution of the natural ecosystem of peatlands. This study aims to (1) map the distribution of natural ecosystems on peatlands through vegetation objects using Sentinel 2A and SPOT 7 using the OBIA method, (2) Compare the accuracy of Sentinel 2A and SPOT 7 in recognizing endemic vegetation types in natural ecosystems on peatlands with using the OBIA method. OBIA is used to detect the presence of peatlands, the detection is carried out through stretched endemic vegetation objects that grow in the natural ecosystem of peatlands. OBIA is carried out in three steps, namely Segmentation, Classification and Accuracy Test. In the classification process, building a ruleset is the key to interpreting the natural ecosystem of peatlands. The results obtained are (1) Sentinel 2A produces a more dominant distribution on the East, North and West edges while in the middle it tends to be less, the total area of natural peatland ecosystems in Sentinel 2A is 94,994 KM2. In the SPOT 7, the distribution of natural ecosystems of peatlands is more dominant in the eastern part while the western part tends to be small, the total distribution of natural ecosystems of peatlands in the SPOT 7 image is 281,443 KM2. (2) The accuracy rate of Sentinel 2A is 81.395% with an accuracy of 35 samples from a total of 43 samples of accuracy tests and SPOT 7 of 88.372% with an accuracy of 38 samples from a total of 43 samples of accuracy tests carried out.
Seismic Noise Analysis in InaTEWS Earthquake Station Network (Case Study: Flores Earthquake 7.4, 14 December 2021)
Authors: Hakim Arif Rachman , Saputro Adhi Harmoko , Rohadi Supriyanto , Gunawan Mohamad Taufik , Kardoso Ricko 
Published: July 2022

Abstract
Meteorological, Climatology and Geophysics Agency (BMKG) is the agency responsible for providing information on earthquake parameters in Indonesia. BMKG has installed 411 seismometers network spread across Indonesia, this network is known as the Indonesia Tsunami Early Warning System (InaTEWS) network. The dense distribution of the seismometer is expected to be able to provide accurate earthquake parameter results. However, the accuracy of earthquake parameters does not only depend on many stations but also on the quality of the data recorded by the seismometer. In this study, an analysis of 15 data quality was carried out at the nearest station that recorded the Flores earthquake on December 14, 2021. Analysis of data quality using the power spectral density (PSD) and probability density functions (PDFs) methods, where good data quality can be seen in the spectrum of the seismograph recordings that are between the Peterson’s new high noise model (NHNM) and new low noise model (NLNM).
Analysis of Exploration Wells on Aquifer in Kaliwungu Formation and Regional Planning Recommendations
Authors: Darul Achmad , Kurniawan Rizki , Irawan Dasapta Erwin , Wibowo Dimas Maulana 
Published: July 2022

Abstract
Infrastructure development in the northern coast of Java continues to take place. The study and support of subsurface geological data and the value of hydrogeological parameters is one of the important parameters to support sustainable development. The existence of well exploration reportedly can support researchers for model validation and calibration. We carried out One-Dimensional and Two-Dimensional geoelectrical acquisition along with drilling in the Kaliwungu Formation which was lined with the Halang Formation. Ten points of one dimensional geoelectrical and two lines of geoelectrical acquisition VES method (Vertical Electrical Sounding), with a depth range of 100m Schlumberger and Wenner-Schlumberger configurations for profiling have reflected the study area dominated by aquitard (silty clay) with resistivity values < 20 ohm.m. The result of VES was then followed up by analysing the value of the well logging resistivity which was compared with the lithology of the cutting results in the 108m deep drill hole. Value of hydrogeological properties was carried out by the pumping test, were pumping test analysed using pumping cooper – Jacob single well software, and the result of hydraulic conductivity value was 6 x 10-9m/s, and the transmittivity value was 5.6 x 10-7 m2/s. Based on the Farvolden Method, the safe yield value was found to be comparable to the value according to Johson which is 3-8%.
Monitoring CO and O3 concentration that caused climate change periodically using Google Earth Engine (study case: Java Island)
Authors: Ikram N M , Afifah L , Arthatia B S , Wicaksono S J , Maharani M , Ediyanto  , Ihsanudin T , Apriyanti D 
Published: July 2022

Abstract
Climate change is the change of temperature and weather pattern in long terms caused by the accumulation of greenhouse emission in the atmosphere. Those emissions act like a blanket covering earth, trapping heat and causing the increase of earth’s temperature. The emissions of greenhouse gases causing climate change are CO2, O3, N2O, CH3, et cetera. The existence of these gases have to be observed periodically for monitoring and controlling purposes. These days, remote sensing is capable of doing that. Sentinel-5P imagery exists as an imagery that can observe gas concentration within the earth’s atmosphere. This research is aimed to observe CO and O3 gas, which cause climate change, using Sentinel-5P satellite imagery using Google Earth Engine (GEE) periodically. GEE is a platform allowing its users to access and process data freely. The result of this research shows that there is a change in CO and O3 concentration throughout January to November 2021. The highest concentration for CO was in October, and the lowest was in July. Meanwhile, the highest concentration for O3 was in October, and the lowest was in June. Based on the research done, Sentinel-5P satellite imagery succeeded in monitoring CO and O3 concentration periodically every month.
Love Wave Dispersion Analysis from Ambient Seismic Noise in Banyumas Basin, Central Java, Indonesia
Authors: Kusuma A H , Zulfakriza  , Nugraha A D , Rosalia S , Setiawan A , Marjiono  
Published: July 2022

Abstract
The Banyumas Basin is one of a sedimentary basins in the southern coast of Central Java that has many manifestations of the presence of hydrocarbons in the form of oil and gas seeps found on the surface. Its presence is covered by a thick subvulcanic sedimentary layer. A conventional seismic active method which is usually used to delineate subsurface structures in an hydrocarbon area, however it can be challenging to imaged the structures beneath surface in areas covered by thick sub-volcanic sediments. Another method is needed to investigate the subsurface image in a thick sub-volcanic area, such as Banyumas basin. We cross correlated of the ambient seismic noise at transversal component to retrieve the love wave empirical Green's function. We used 40 broad band seismic stations for 60 days recording from Center for Geological Survey - Indonesian Geological Agency. The daily cross-correlated data then stacked to obtain the Love waves Green’s function. The Green’s function is clearly seen in 1-10 s period band. Then, the obtained Green’s function will be analyzed to get the Love waves group velocity.
Warming trend during Medieval Climate Anomaly in Tropical Maritim Indonesia: Records from Porites Corals
Authors: Cahyarini S.Y. , Hendrizan M. , Utami D.A. 
Published: July 2022

Abstract
A period that lasted from 900-1300 AD has been known as the Medieval Climate Anomaly. This period has been indicated as the warming period of the earth’s temperature. However, this warming phenomenon is still the subject of debate today, whether global or regional warming. Several studies concluded that the Medieval warm period is a global phenomenon and an important warm period, although external forcing is mainly similar to the present day. Several climate archives from Indonesia i.e. lake sediment, marine sediment and speleothem show a warming trend during this period. In this study, the seasonal warming trend during the Medieval climate is resolved from Porites coral from Lampung Bay, Indonesia. However, the seasonal temperature magnitude during the Medieval period is lower than today. This study confirms the coral medieval climate records from Mentawai islands. The result suggests that a warming trend occurred in Indonesia during the Medieval climate anomaly.
Characterization Of Sedimentary Process In An Estuarine Environment Based On Grain Size Trend Analysis And Geochemical Trace Element In The West Flood Canal River, Semarang
Authors: Devienna S N , Nugroho S H , Kurniasih A , Putra P S , Lestari  , Awibowo S P , Kaisupy M T , Amar  , Jakah  
Published: July 2022

Abstract
The West Flood Canal River is one of the major rivers that flows the central of Semarang Bay. The west flood canal river is located in the middle of a densely populated residential and used as city drainage in the Semarang. Unfortunately, the upper part of the river has been swallowed up. This river has unique sedimentation dynamics, so it becomes a suitable research object to determine the relationship between river sedimentation processes and the concentration of trace elements contained in the sediment. A core sample was taken at the mouth of the west canal flood river for research purposes. The analysis included grain-size trend analysis (GSTA) and geochemical trace elements on 40 sub-samples of sediment core slices within 1 cm intervals. Afterward, the GSTA results were grouped by clustering to obtain lithofacies. Each lithofacies has geochemical characteristics that indicate changes in environmental conditions over a period of time. The GSTA showed that the sediment core is dominated by coarse silt to fine silt. The cluster showed there are at least 5 lithofacies, which have different sedimentary characteristics. In general, the character of the sediment which is dominated by coarser grain size has a higher concentration of Fe, Ca, Mn, Ti, and lower levels of K. On the other hand, the sediment group which has a sedimentary character dominated by fine grain size has a lower content of Fe, Ca, Mn, Ti, and higher K levels.
The Relationship of Lithology with Landslide Occurrences in Banyumanik and Tembalang Districts, Semarang City
Authors: Trisnawati D , Najib  , Hidayatillah A S 
Published: July 2022

Abstract
Movement of soil and rock masses down the slope or known as landslide is a natural activity that can pose a danger to humans. Generally, landslide can be influenced by the slope, slope materials (rock/soil), and rainfall. Morphologically, the study area, which is located in the borders of Tembalang and Banyumanik Districts, Semarang City, is a hill that is quite steep. It has a potential to experience landslides. Landslide occurences at the study area do not always occur on steep slopes. Therefore, the aim of this study is to determine the relationship between the slope materials and the occurrences of landslide. Data was obtained through mapping to determine geological conditions and enlisting landslide occurrences at the study area. Furthermore, the correlation between the number of occurrences and the type of slope materials at the location of the ground motion was carried out using information value method. Based on geological mapping, 5 types of lithology were obtained, namely: alluvium, breccia, sandstone, siltstone, and claystone. Out of 10 landslides that were found, 6 of them occurred in claystone lithology. We interpret that landslide occurrences in study area are relating to the lithology claystone with information value 0.416. The claystone, a part of the Kerek Formation, physically were easily degraded. In addition, this lithology mostly found in open slopes, where the process of erosion by water is more intense.
Numerical Modelling of Wave Attenuation in Pile Breakwater
Authors: Abdullah F.A.R. , Suprijo T. , Diastomo H. , Napitupulu G. 
Published: July 2022

Abstract
Pile breakwater is an artificial coastal structure consisting of closely spaced piles. Its benefits are similar to other coastal structures by attenuating the energy of the incoming wave. In this paper, the wave attenuation caused by the pile structure is investigated using a numerical model, namely the SWASH model. The model allows for simulating non-hydrostatic phenomena in coastal waters as driven by waves. The model setup is conducted in a rectangular wave flume with paddles to produce monochromatic waves on the left and the wave absorber on the other side. Several scenarios were carried out to determine the effect of variations in wave parameters. To deal with the efficiency of numerically modelled pile breakwater, we also investigate the transmission coefficient. We compare the result of the numerical model with experimental data, which took place in a wave flume at Balai Penelitian dan Pengembangan Pantai, Buleleng, Bali, Indonesia. The validation results demonstrate the capability of the SWASH Model to approximate the incident and transmitted wave height with good accuracy compared to experimental data.
Australian–Indonesian monsoon rainfall responses to the northern hemisphere climatic changes prior to the Last Glacial Maximum: an early indication
Authors: Ardi R D W , Aswan  , Maryunani K A , Yulianto E , Putra P S , Nugroho S H 
Published: July 2022

AbstractThe evidences of Australian-Indonesian monsoon (AIM) rainfall response to the northern hemisphere climatic changes from both marine and terrestrial proxies are well established for the Last Glacial Maximum (LGM) – Deglaciation time interval but not in the previous time interval. Sediment cores from off south Sumba (ST10) and off north Sumba (Sumba strait) (ST14) were analyzed using X-Ray Fluorescence method to obtain elemental proxies. Elemental ratios which reflect terrigenous input (Ti/Ca and K/Ca) are used to infer the AIM rainfall changes since ~42 ka BP. AIM rainfall changes indicate a clear response to the Heinrich Events prior to the LGM (H2, H3, and H4). H2 and H3 are corroborated with the AIM rainfall increases in off south Sumba (~24 – 26 ka BP and ~30 – 31 ka BP) while the AIM rainfall increase (~39 – 41 ka BP) in the Sumba strait indicates a response to H4. The cooler temperature during the Heinrich Events could enhance the Northern Hemisphere (NH) cold surges which eventually pushed the Austral summer Intertropical Convergence Zone (ITCZ) southward in a similar fashion to the Last Deglaciation period (~18 – 11 ka BP). The southward movement of Austral summer ITCZ should increase the research area’s exposure time to the Tropical Rain Belt (TRB) during the Australian – Indonesian summer monsoon (AISM) which eventually triggers the AIM rainfall increase. The Sumba strait AIM rainfall unresponsiveness to H2 and H3 could be related to the constant exposure time to the TRB which indicates that the southern limit of Austral summer ITCZ during its northernmost shift didn’t reach the latitude of Sumba Strait. Comparison with other proxies from the same site and other rainfall proxies from southern Indonesia and the northern Australia regions is needed to confirm the spatial extend of those responses.
Characteristics of volcanic rocks and associated intrusions based on petrography analysis in Jari-Krondonan Area, Bojonegoro Regency, East Java
Authors: Marin J , Muhammad Y M , Winarno T 
Published: July 2022

Abstract
Pandan volcano is one of the dormant Quaternary volcanoes in East Java characterized by several volcanic centers which extend to the northern part. This study is aimed to identify the volcanic rocks and intrusions of Jari - Krondonan area, Bojonegoro as well as determine their petrology and mineralogical characteristics. Geological observation was conducted to obtain primary data and to collect samples. Thin section of samples was prepared to analyze the petrographic aspects. Field observation shows several volcanic hills at Mount Jati, Mount Puru, Mount Watu, and Mount Lawang sites. Based on field mapping, lithologies of the research area are andesitic lava and intrusion with columnar joint or sheeting joint structure, surrounded by andesitic breccia. Andesite characterized by porphyritic texture with visible phenocrysts and volcanic glass groundmass. Samples from Mount Lawang and Mount Watu are composed of plagioclase and hornblende as main minerals. Samples from Mount Jati and Mount Puru are composed of plagioclase and pyroxene. Quartz, sanidine, and olivine present as accessory minerals. Plagioclase and pyroxene occasionally formed glomerocryst and poikilitic texture, which play an important role in the fractionation and crystal settling processes. Sieve and regular zoning in plagioclase suggest magma mixing. Gabbro and metamorphic xenoliths found in Mount Lawang and Mount Watu indicates an interaction with country rock during magma rising.
Balancing nature and landscape conservation practices of Leukon Community in Simeulue Island
Authors: Lubis T , Abus A F , Ramlan  , Nasution T , Saputra N 
Published: July 2022

Abstract
This study described the Leukon Community's daily interactions with the natural environment to preserve nature's balance and landscape conservation in social spaces conducive to sustainable growth. The natural environment's behavior features can be studied through the interaction of interacting areas such as fields, flora, and the sea that are habitable for the Leukon Community. Natural resources and the environment play a critical role in the Leukon Community's survival system due to the community's availability and ability to utilize raw materials. This research applies a qualitative strategy, an investigative procedure used to comprehend social or human problems based on a holistic description. The ethnographic technique is employed as a paradigm, with in-depth interviews and participant observation. The results indicate that the Leukon Community practices environmental stewardship by avoiding mechanization and chemical use in farming, capturing fish with environmental friendly technology, and relying on woody tree vegetation for basic requirements. As a result, the delicate balance between nature and environmental preservation is preserved. Avoiding soil and water damage promotes landscape conservation, resulting in a more natural and beautiful landscape. This is because the Leukon Community manages the area sustainably by utilizing natural resources in accordance with local wisdom values and belief systems.
Application of Geospatial Information System (GIS) coupled with field sampling technique for soil mapping and information
Authors: Khairudin M N , Kassim N Q B , Zulkifli Z 
Published: July 2022

Abstract
In most agricultural area, the efficient and proper management is found effective using the information gained from the combination of Geospatial Information System (GIS) combined with field sampling techniques. This study aimed to determine the physico-chemical properties of selected soil area and to develop a small-scale thematic mapping using the ArcGIS software. The research was conducted at matured oil palm plantation in UiTM Kampus Jasin, Melaka, Malaysia. The field results showed that the soil pH range between pH 4.2 and pH 5.2 with a bulk density ranging between 0.31 gcm-3 to 0.64 gcm-3. The area also has a high soil moisture content and mixtures of organic matter which has undergo complete decomposition. Based on the data, the information was then transformed into the thematic map and displayed in different colours to differentiate between parameters. In the thematic map, the red colour representing the low pH area while the yellow zone representing the increment of soil pH. The transition of hue colour from red to yellow represent the improvement of soil pH in particular area. As such, any changes in soil pH can be monitor consistently and any management requirement can be directly applied at the affected area without requiring the whole field assessment. Through this, the problems can be solved in shorter time without requiring much labour and able to minimize the cost. Hence, this study suggested that the GIS techniques combined with the field sampling techniques to monitor the land is much faster and efficient for a proper land management.