bluuebunny/crossref_metadata_2025_split huggingface dataset:
Mataram Fault – New Active Fault Crosses East-West in the Centre of Yogyakarta City
Authors: Daryono Mudrik R. , Pamumpuni Astyka , Wardhana Dadan D. , Natawidjaja Danny H. 
Published: September 2023

Abstract
Yogyakarta has experienced two devastating earthquake disasters: May 26, 2006, Mw6.4, and the penultimate event, June 10, 1867 Mw7.7. The active fault that is thought to be responsible for the two earthquake events is the Opak Fault. However, the Opak Fault has still not been thoroughly well mapped yet. The lack of a high-resolution image, dense vegetation cover, high sediment flux from the Merapi volcano, and human activities eroding the original landscape challenge studying the on-land fault in this area. Our recent study, however, indicates that the Opak Fault is not the only active fault that can cause a major disaster, but another fault strand exists in the area. We mapped the fault using the best available data of DEMNAS assisted by more detailed DEM and Orthophoto, developed from drone survey, and we also conducted Earth Resistivity Tomography (ERT) survey. We found that inferred new active fault is oriented East-West across the center of the high-populated city. The fault runs parallel and close to the famous Mataram channel (Selokan Mataram). The fault is likely continue the previously recognized Dengkeng Fault, east of the Opak fault. The fault strand is indicated by morphological lineaments and a few steam offsets. Our ERT 2D sections have revealed the fault zone in several locations along the inferred fault line. The fault line cut the Young Quaternary rocks; hence, it is an active fault. Further studies are needed to get further details of this newly recognized active fault, such as conducting paleoseismological studies, detailed seismological survey, geodetic GPS measurement, and acquiring a high-resolution image acquisition survey (LiDAR – Light Detection and Ranging Survey).
Late Quaternary Deformation of the Ambon fault, Indonesia: Preliminary Results
Authors: Patria Adi , Hanif Muhammad , Amar  , Tsutsumi Hiroyuki 
Published: September 2023

AbstractThe Ambon fault in the northern Banda Arc has capability of generating Mw6.9 earthquake. The Ambon fault poses a significant seismic hazard to Ambon Island because the fault is located near populous areas, the Ambon City. Recent seismicity in Ambon Island and surrounding areas indicates that this region is actively deforming. Ambon Island has experienced many damaging earthquakes since the 17thcentury. However, the potential seismic hazard on this island remains enigmatic due to the lack of detailed geological information, such as fault traces, slip rate, and paleoseismic history. This study reports the preliminary results of tectonic geomorphic investigations and ground-penetrating radar (GPR) surveys on the Ambon fault. Tectonic geomorphic features, such as fault scarps, warped surfaces, and sag ponds indicate the late Quaternary activity of the Ambon fault. The Ambon fault predominantly shows a normal sense of motion with a dip of ~60-70°. The Ambon fault is related to the extensional tectonics in the Banda Sea.
Reconstruction of Retrogressive Landslides Using Integrated Technique of Geoelectric Resistivity and Borehole Logging in Sumampir, Purbalingga Regency, Central Java
Authors: Sadisun Imam A. , Dinata Indra A. , Wibisono Gunawan , Guswiyanto  
Published: September 2023

Abstract
The landslide occurred in Sumampir of Purbalingga Regency has reached 120 m in length and 50 m in width. This landslide is suspected to be a retrogressive landslide, which was manned by a landslide associated with the cliffs of the Brangkal River. This landslide is interpreted as progressive development of a landslide associated with Brangkal river bank failures, which continues to enlarge to the dimensions as measured currently. The main active landslide has a steep scarp of along 60 m with a height of up to 8 m, with several transverse tensile cracks were found in between the scarp and above the crown. These tensile cracks have caused partial subsidence on the side of the village road that crosses it. In order to determine the existence of slip surface that have developed since the first landslide formed until the last one, an integrated technique of geoelectric resistivity and borehole logging has been applied. This integrated technique was then used to reconstruct the landslide progression retrogressively towards the top. The results of the geoelectric resistivity analyses indicated that there are four stages of slip surface formation. The first slip surface is located at 80 m south of the village road, which is defined to be the initial of a retrogressive landslide. The second slip surface located at 40 m from the village road is possible to be a former landslide damaged the prior village road. The third slip surface is formed at a distance of 15 m from the village road, which is a landslide considered to have caused the bridge to collapse. The fourth slip surface is located at the side of the village road, which is the last landslide causing the concrete slab of the bridge moved 15 m to the south. The average depth of the slip surface is about 8 m. This depth has been confirmed using borehole logging data, by obtaining a relatively hard weathered claystone layers at a depth of 6-8 m.
Numerical Example to Estimate Groundwater Level Changes using Time-lapse Microgravity Data
Authors: Wahyudi E J , Setianingsih  , Irawan D E , Sule R M 
Published: September 2023

AbstractThe study using time-lapse microgravity (TLM) data can be helpfull to understand near surface variation caused by hidrological variation. Shallow groundwater variation can be highly correlated with density variation as time-lapse microgravity source, because the changes are very close to the surface. For several days (or weeks or months), we can observe density variation in the near surface caused by the changes of water saturated zones. The time-lapse of density variation for several days can be simplified as groundwater table changes. The purpose of this work is to study time-lapse microgravity application for groundwater level estimation. Using numerical example, we utilize lateral variation of time-lapse microgravity signal and also surface topography. In order to do the estimation groundwater level for second TLM survey, we need the groundwater level data from first survey (and vice versa). After numerical example, we applied the algorithm in the study area of (5 × 5) km square in the Blora regency. The shallow groundwater level (0 to 14 meters below the surface) are observed after the second (2016) microgravity survey. From this work, we constrained the model using second groundwater level data. After iterative calculation of using TLM anomaly (value in the range of -80 to +80 microGal) with surface topography variation (in the range 90 to 230 meters), we get the estimation the first (2014) groundwater level variation in the range of -7 to 7 meters from the second (2016) groundwater level data.
Observing Near-Real-Time Volcanoes Deformation Using InSAR – Time Series of LiCSBAS in Indonesia
Authors: Fattah Erlangga Ibrahim , Saepuloh Asep , Nugraha Andri Dian 
Published: September 2023

Abstract
The Synthetic Aperture Radar (SAR) sensors onboard satellites are leading in advance to monitor physical changes of volcano edifices such as deformation. A few days of temporal resolution imageries provided by Sentinel-1 SAR make it possible to monitor volcanoes worldwide in near-real-time monitoring. The Sentinel-1 constellation produces a large amount of SAR images valuable for monitoring volcano deformation and hazard mitigation. However, processing the Interferometric SAR (InSAR) for a large SAR dataset is time-consuming and requires high-performance computers. Overcoming the problem, the Center for Observation & Modelling of Earthquakes, Volcanoes & Tectonics (COMET) created a program called Looking Inside the Continents from Space of Sentinel Aperture Radar (LiCSAR) integrated to InSAR time-series analysis of LiCSBAS InSAR to process and calculate the interferogram deformation in time series efficiently. This study presents the LiCSBAS observation for volcanic activities at Mts. Sinabung and Agung in North Sumatra and Bali, respectively. We have observed the activities of both volcanoes from 2015 to 2022. We have analyzed 1824 and 848 interferograms of Mt. Sinabung and Mt. Agung, respectively. The LiCSBAS InSAR time-series analysis was successfully processed for Mts. Sinabung and Agung despite being located under tropics. Velocity deformation of Mt. Sinabung is dominated by uplift around the summit, consistent with measurement by the Center for Volcanology and Geological Hazard Mitigation (CVGHM). In the period of January to March 2017, the lava dome measurement using laser distance meter showed an increase from 1.2 Mm3 to 1.7 Mm3, while LiCSBAS detected an uplift movement of 14 mm. On the contrary, the deformation of Mt. Agung at the summit of lava dome is 3 mm/yr indicate uplift, while subsidence is observed around the crater.
Ambient Seismic Noise Cross – Correlation of the Tangkuban Parahu Volcano, West Java Indonesia: Preliminary Result
Authors: Lesmana Aditya , Priyono Awali , Nugraha Andri Dian , Zulfakriza  , Rosalia Shindy , Basuki Ahmad , Kristianto  
Published: September 2023

Abstract
Tangkuban Parahu is an active volcano in Indonesia that is part of the Quaternary Sunda volcanic arc. We used the vertical component of waveform recorded by 55 temporary seismic stations deployed around Tangkuban Parahu volcano from October 2021 to February 2022 to gain a thorough understanding of its seismic structure. To extract empirical Green’s functions, we computed cross-correlations of the vertical component of continuous record data. The empirical Green’s function was extracted from the daily data series, and the cross-correlation data from each day was stacked into a single inter-station cross-correlation data set. The empirical Green’s Function is seen at the band period 1-10 s. In this preliminary result, we obtained the Rayleigh wave group velocity map in period 1 s. The result shows a low-velocity value around the crater surrounded by high velocities. The low velocity is related to the weak zone or fluid presence.
Early Result of Imaging 3D Seismic Velocity Structure In Central Java Using Double-Difference Tomography
Authors: Saputra R , Lubis M H M , Wulan E P 
Published: September 2023

Abstract
Central Java is a part of the Sunda Arc and has relatively high seismicity due to the subduction zone between the Indo-Australian Plate and the Eurasian Plate. This study uses double-difference tomography to image the P and S wave 3D seismic velocity structures associated with tectonic patterns due to subduction zones. The data used comes from the earthquake catalogs of BMKG, BPPTKG, DOMERAPI, and MERAMEX, with a recording period from May 2004 to December 2020. The number of earthquakes that successfully relocated was 1930 from 1937 earthquakes recorded by 285 recording stations. The results of hypocentre relocation show that seismic activity in Central Java is relatively high and originates from geological structures, including subduction zones, back-thrust, and the Opak Fault. The tomogram results of the P and S wave velocity models support each other. The high seismic velocity anomaly is associated with the subduction zone of the Indo-Australian Plate to the Eurasian Plate with a maximum resolution of up to 100 km depth. Low seismic velocity anomalies are found at the Merapi-Lawu Anomaly (MLA), the Modern Volcanic Arc (MVA), the Sumbing-Sundoro-Dieng volcanic complex, the Banyumas-Cilacap sedimentary basin, and the Kendeng Basin. A low-velocity anomaly is found at a depth of about 40-50 km and a depth of 100 km, which is associated with the process of slab dehydration and partial melting. The inversion results show the impact of the Indo-Australian Plate subduction and the Eurasian Plate on volcanic activity, seismicity, and the geological structures developed in Central Java.
Modeling Crustal Structure in West Sumatera Using Teleseismic Receiver Function
Authors: Ratna W S 
Published: September 2023

Abstract
Indonesia is located between three significant plate confluences that play a role in creating a subduction zone. Sumatra, one of Indonesia’s provinces, is located near the collision of the Eurasian Plate, the Indo-Australian Plate, and the Pacific Plate. The Semangko Fault, the Mentawai Islands, a chain of non-volcanic forearc islands, and active faults that induce earthquakes and landslides are all produced by subduction zones on Sumatra Island. The receiver function approach was developed to identify the discontinuity limits of the Earth’s structures, such as the crust and mantle, from teleseismic events. The information in this study comes from 25 temporal and 1 permanent station in West Sumatra and the time period between 2007 and 2009 from the IRIS data station. The earthquake data was taken from teleseismic earthquakes from the three components of seismic stations using criteria arc distances between 30° and 90° and magnitudes ranging from 6.0 to 10.0. This research aims to determine how crustal thickness is distributed and what effect regional geological structure has on crustal thickness. According to the early results of the study, the estimated range of crustal thickness in the research region is 27.11–32.48 km, and the range of Vp/Vs ratio values is 1.70–2.19. The direction of crustal thickness thickening in the area was likewise East-South.
The Integration of Critical Risk with Building Information Modelling (BIM) Application Strategies in Building Refurbishment Project Lifecycle
Authors: Anuar Nur Hidayah Khairul , Ishak Nurfadzillah , Shohime Nor Suraya 
Published: September 2023

Abstract
Building refurbishment project is rapidly becoming a significant part of the construction industry in Malaysia. Refurbishment projects are typically higher risk, more complex, and require more coordination than new construction projects. The refurbishment industry has the potential to expand and contribute to Malaysia’s overall building output. The growing demand for refurbishment work in Malaysia will be driven by the increasing number of old and failing structures, as well as the limited space available for new development. Therefore, the aim of this research is to establish the most significance integration Building Information Modelling (BIM) application strategies in managing the risk for building refurbishment project lifecycle improvement. In this regard, this study was conducted through a quantitative method using the questionnaire which was distributed by employing a self-administrated approach as a research medium to obtain feedback from project manager who has been a representative from G7 registered construction organization with Construction Industry Development Board (CIDB) Malaysia. As a result, 96.7 percent of the response rate were accepted. The analysis showed that the integration of critical risk with BIM application strategies was recognized as important factors and strategies towards building refurbishment projects lifecycle improvement and found that the mean is in very high range. Additionally, the results indicate that the level of critical risk and BIM application strategies have been measured through descriptive analysis. The findings of this study are expected to establish a foundation for future research in order to develop an adequate framework for managing building refurbishment projects and improve the quality of decision making among the building industry professionals.
Environmental impact screening for urban land use transitions - a perspective from developing a hill land development in Penang Island and shaping community acceptance
Authors: Ismail Siti Isma Hani , Hassan Siti Hafizan , Badrul Hisham Afiq N. , Seng Loh Yong , Zakaria Zulfairul 
Published: September 2023

Abstract
The current rate of urbanisation is unprecedented in human history, particularly in Malaysia’s densely populated areas. Natural constraints and hazards are frequently ignored in this informal and sprawling urban growth, exposing the population to these hazards. Deforestation, water catchment loss, extinction of protected species and plants, soil erosion, landslides, water pollution, sedimentation, and downstream flooding have all resulted from inadequate environmental mitigation. Hence, this research quantifies and assesses the environmental and social impacts of hill land development on the affected areas. The community’s opinion on such growth and environmental mitigation measures will be assessed and evaluated at a study site on Penang Island, Malaysia. Environmental Impact Screening (EIS) was conducted by distributing questionnaires to affected residents and businesses, with 69 respondents. Descriptive statistical analysis was performed using the Statistical Package (SPSS), followed by a thorough elaboration on the pros and cons of expanding this steep land by considering social, economic, and environmental consequences. From the evaluation, most respondents were opposed to hill land development that can harmed community’s ecosystem. As a result, numerous efforts have been made to reduce community and environmental impacts. This study enables stakeholders to assess the environmental impacts from this type of developments and conduct necessary steps to mitigate or eliminate them.
Utilization of Coir Fibre Ash (CFA) in Cement Stabilized Peat
Authors: Rashid Aklili Nadhirah Asma Azmin , Talib Mohd Khaidir Abu , Yusoff Mohammad Nasrul Mohd 
Published: September 2023

Abstract
Peat is a soil that has a high compressibility property beside having a low bearing capacity. Due to these problems, the peat soil is not suitable for construction purposes. Coconut waste is an example of agricultural waste. In the context of environmental sustainability, the use of coir in geotechnical applications is desirable. This research was conducted to study peat stabilization by using Coir Fibre Ash (CFA) in partially replacing Ordinary Portland Cement (OPC) to improve the physical and geotechnical characteristics. Geotechnical laboratory experiments involved in this study are moisture contents, organic contents, fiber content, Atterberg limits, specific gravity, Unconfined Compression Strength Test (UCS), Scanning Electron Microscope (SEM) and Energy Dispersive X-Ray (EDX). In this study, the use of CFA as a stabilizer were used at mixture ratio of 5, 10, 15 and 20% of OPC replacement. Based on the UCS test carried out, it is found that the optimum strength for each ratio of CFA in the mixture showed a decrement pattern if compared to cement stabilized peat (PC). The results of SEM test shows that the structure of untreated peat becomes denser after stabilized. This is due to the cementing process. EDX test shows that the carbon content in the soil decreases while calcium content increases after the stabilization process is executed. Therefore, CFA is suitable to be used as pozzolan material in stabilized peat and can reach up 200kPa of UCS at 20% OPC replacement.
Influence of Gate Lip Angle on Downpull Forces for Vertical Lift Gates
Authors: Khor Hao Zhe , Puay How Tion 
Published: September 2023

Abstract
Underestimation of hydrodynamic downpull force is one of the most dangerous risks when operating a vertical lift gate. The downpull force acting on the gate is affected by gate geometry. The purpose of this study is to investigate the influence of gate lip angle on the downpull force of vertical lift gates using Flow-3D®, a commercial CFD software. Simultaneously, the performance of Flow-3D® in estimating downpull force is evaluated. The influence of gate lip angle on the downpull force is investigated by simulating flow under different gate lip angles at different gate openings. The setup of the numerical model is similar to the experiment setup used by Naudascher in 1964. Results show that the higher the gate lip angle, the higher the bottom downpull coefficient. Majority of the numerical results show good agreement with the experimental results. Case 2 at 30% gate opening and case 3 at 50% and 60% gate opening showed obvious deviation from the experimental results due to flow separation occurred at the gate lip. This could be due to the limitations of the Fractional Area-Volume Obstacle Representation (FAVOR) method employed by Flow-3D® in which gate lip part that is smaller than mesh cell could not be exactly reproduced.
The Adoption of Unmanned Aerial Vehicles (UAV) Technology in the Construction Industry: Construction Stakeholders’ Perception
Authors: Keong Kong Foo , Chang Sa’ar Chai , Kaliannan Suaathi , Najib Nurul ’Ulyani Mohd 
Published: September 2023

Abstract
In parallel to the Industry Revolution 4.0, the introduction of Unmanned Aerial Vehicles (UAV) in construction is expected to improve the construction project management efficiency. Although much research works has been done by the academics in uncovering the advantageous potentials of using UAV in construction, the barriers and drivers that influence the construction companies towards adopting UAV have received scant or very limited attention from the academics. Even though the UAV technology infrastructure has progressively been developed and improved by the government and the UAV manufacturers with some construction companies successfully got on board the platform to tap the potentials for gains, however there are construction companies have yet to act on it. This paper aims to identify the main drivers of the construction companies in adopting and integrating the UAV into their construction activities or business. The semi-structured interviews were designed using theory of interpersonal communication in achieving an honest exchange of information on the perception of the participants, their encounters, experiences, views and expectation with respect to the use of UAV in their business activities. This study was conducted with eight respondents from Johor Bharu and Kuala Lumpur of diverse background and experience in the construction and UAV. The findings show that relative advantage, education, knowledge of technology, positive attitude of the decision makers, compatibility of technology, simplicity of technology, and observability are the six drivers to the adoption of UAV in the construction industry. Therefore, this study may serve as a conceptual framework for the future research works on the adoption of UAV in the Malaysian construction industry as the industry is increasingly digitally driven with the emergence of new technology such as the UAV application technology.