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Liquefaction and normal fault in Talise Valangguni and Tanamodindi Villages of Palu City;A preliminary observation of impact MW 7.5 earthquake in 2018 at Central Sulawesi Province, Indonesia 2

Liquefaction and normal fault in Talise Valangguni and Tanam...

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2nd International Seminar on Science and Technology 2020, ISST-2 2020

作者： Abdullah Abdullah, A.I. Geophysical Engineering Study Program Tadulako University Indonesia

Talise Valangguni and Tanamodindi Village are among the areas that affected by 28 September 2018 earthquake. This fact-based on our findings about ground surface deformation, the liquefaction and normal fault surface rupture effect. We then make further observations to record the existing hazard characteristics and delineate the affected area to see the hazards configuration to geological factors. The results showed there were 5 liquefaction areas with about 0.13-1.29 km2. The liquefaction effect characteristics that we found are fracture, downlift-uplift, wavy surface, sudden stagnant water, and lateral spreading. Liquefaction sites in this area are identical in seasonal river routes and strongly influenced by lithological, hydrogeological, and earthquake. The sediment deposits are dominated by saturated sand, which can experience significant infiltration, worsening the soil strength size. As a result, this area is susceptible to liquefaction effects when strong earthquakes occur. Meanwhile, normal faults are ± 1.5 km long, oriented west-east, where the southern block has decreased between 5-30 cm. We suspect that this fault existed before the earthquake and appear on the surface after the quake, contributed by shocks and gravity. We hope that this information can be used as a reference for spatial planning for Palu City in disaster mitigation. © Published under licence by IOP Publishing Ltd.

关键词： Earthquakes

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Analysis of the Groundwater Table of Theis's Formula Through the Analytical and Numerical Methods Combination for Time-Lapse Microgravity Modeling

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SSRN 2024年

作者： Lestari, Mutia Dyah Dahrin, Darharta Abdurrahman, Dadi Azhari, Naila Yuni Faculty of Mining and Petroleum Engineering Institut Teknologi Bandung Jalan Ganesa 10 Bandung40132 Indonesia Geophysical Engineering Study Program Institut Teknologi Sumatera Jalan Terusan Ryacudu Desa Way Hui Lampung Selatan Kecamatan Jatiagung 35365 Indonesia

Massive and continuous well pumping can result in significant groundwater table decline, potentially leading to groundwater depletion and land subsidence over the long term. The timelapse microgravity method, an innovation in gravity measurement techniques, is currently widely used in hydrological applications, including groundwater table monitoring. Groundwater pumping induces changes in subsurface mass distribution, resulting in subsurface mass anomalies that can be detected using gravity method. Many previous studies have employed the slab Bouguer approach to estimate gravity anomalies due to groundwater table changes. This method has significant error for detail anomaly value of groundwater table, which is high decline near production wells. According to Theis formula, the groundwater table decline model as drawdown cone (inverted cone), which gravitational field is calculated. Therefore, calculated gravity anomaly must account for the drawdown cone shape. In this study, gravity anomaly calculations for groundwater drawdown cones are resolved by integrating triple integrals using cylindrical coordinates both analytical and numerical methods. The analytical calculation of integrating triple integrals can only be resolved for two variables (variable z and [[EQUATION]]), and for [[EQUATION]] variable is calculated using numerical methods with the trapezoidal rule. By making the trapezoidal step smaller for closer the well, it is expected this calculation has smaller errors. This study aims to provide more accurate gravity anomaly calculations in accordance with the conceptual model of groundwater table changes. This technique can be used to help groundwater management where monitoring wells is insufficient. © 2024, The Authors. All rights reserved.

关键词： Microgravity

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Landslide investigation through surface geological study and photogrammetry methods in Poi area, Sigi Regency Central Sulawesi

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AIP Conference Proceedings 2023年第1期2719卷

作者： Asrafil Asrafil Muhammad Fuad Afdal Mauludin Kurniawan Geological Engineering Study Program Tadulako University Palu 94118 Indonesia Geophysical Engineering Study Program Tadulako University Palu 94118 Indonesia

The earthquake that occurred on September 28, 2018 with a magnitude of 7.4 Mw at Central Sulawesi, caused damage to the extraordinary areas of Donggala, Palu, Sigi, and surrounding areas. The shock caused by the earthquake-triggered landslide in Poi Village, South Dolo District, Sigi Regency, with large dimensions on the hillsides and resulted in the formation of piles of material and closed the water flow to the west of the Poi Village settlement (Geological Agency 2018). Investigations through surface geological studies and photogrammetry were carried out to identify surface geological conditions and potential landslide susceptibility in the study area. Based on the results of the geological review and analysis, it is known that the geology of the research area is composed of 3 rock units, namely the granite intrusion unit, the conglomerate unit, and the alluvial deposit unit. The photogrammetry results show that the structural activity acting on the study area is proven by the presence of two shear faults with opposite displacement directions. The landslide control factor in the study area lies in the structural conditions, slope, and geohydrological conditions as well as the level of weathering that occurs in rocks in the study area.

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Geological hazards that occurred on September 28, 2018 in Sirenja sub-district Donggala Regency, Central Sulawesi Province, Indonesia

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AIP Conference Proceedings 2023年第1期2719卷

作者： Abdullah Abdullah Ahmad Imam Abdullah Fitrawati A. Marhum Ajeng Listianti Muslimin Umar Botjing Muhammad Rusli Muhammad Dahlan Th Musa Abdul Rahman I. Kadek Sulendra Sandra Sandra Geophysical Engineering Study Program Tadulako University Palu Indonesia Geological Engineering Study Program Tadulako University Palu Indonesia Physics Study Program Tadulako University Palu Indonesia Civil Engineering Study Program Tadulako University Palu Indonesia

The location of the Mw 7.5 earthquake on September 28, 2018, was in the Sirenja District of Donggala Regency or about 75 km to the north of Palu City. We present this paper to complete information on disaster data in the northern part, especially for the Sirenja area as an epicenter location. The scope of this research is to present the types of geological hazards, including the area coverage that influenced them. Starting with studying the geological conditions of the Sirenja area, then identifying and mapping the types of hazards that occur. Five types of geological hazards hit the Sirenja area at that time, namely due to surface rupture faults, earthquake shocks, liquefaction effects, tidal flood inundation, and tsunami. Thus, September 28, 2018, is a time that marks the Sirenja area is prone to several geological hazards, and at any time or without knowing when a natural disaster like this will occur again. Based on the results of this study, the local government and the people of Sirenja District are expected to immediately relocate and make a risk reduction strategy or action plan, where the information from this paper can contribute to this.

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Properties of activated carbon from arabica coffee grounds originating from Papua highlands

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AIP Conference Proceedings 2023年第1期2694卷

作者： Octolia Togibasa Khaeriah Dahlan Martina Bunga Yane Ansanay Mumfaijah Fince Imbiri Department of Physics Physics Study Program Universitas Cenderawasih Jayapura 99358 Indonesia Department of Physics Geophysical Engineering Study Program Universitas Cenderawasih Jayapura 99358 Indonesia

Activated carbon is a carbon material with an amorphous structure and a large surface area within a range of 300-2000 m2/gram, and is commonly used as an adsorbent. In this study, we have successfully synthesized activated carbon using Arabica coffee grounds from Tangma Yahukimo, Papua highlands. The coffee ground waste carbon was activated using both ZnCl2 acid and KOH base chemical activating agents. The fabrication process was carried out as follows: dehydration, carbonization, and chemical activation using ZnCl2 and KOH with various concentrations of 20, 30, and 40%. The activated carbon was characterized using an x-ray diffractometer, a scanning electron microscopy and a Fourier-transformed infrared spectroscopy in order to analyze its crystalline structure, morphology and functional groups of the activated carbon. The x-ray diffraction pattern indicated that there was a formation of amorphous structure, although some additional peaks originated from ZnCl2 and KOH residue were still found. The morphology images showed typical mesoporosity with pore size of approximately 10 µm. The Fourier-transformed infrared spectra revealed unique surface groups suggesting that the activated carbon from Arabica coffee grounds originating from Papua highlands may have the potential to be used as an adsorbent for volatile matters. These results may provide recommendations for further development of activated carbon from Arabica coffee grounds precursor.

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The analysis of adsorption capacity in heavy metal ions by using activated carbon from sago waste

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AIP Conference Proceedings 2024年第1期3074卷

作者： Octolia Togibasa Khaeriah Dahlan Yane Oktovina Ansanay Martina Bunga Daniel Napitupulu Tatang Sutarman Piter Wilson Wafumilena Beatrix Yuliana Nukuboy Physics Study Program Department of Physics Universitas Cenderawasih Jl. Kamp Wolker Jayapura 99358 Indonesia Geophysical Engineering Study Program Department of Physics Universitas Cenderawasih Jl. Kamp Wolker Jayapura 99358 Indonesia

Activated carbon is an interesting and third-highest-studied material due to its wide range of applications and environmental benefits. Activated carbon is also a promising material processed from sago waste in order to improve its economic value. The Sago waste utilized was obtained from the local community in Maribu Village, Jayapura, Papua, Indonesia and the fabrication process includes dehydration, carbonization, and chemical activation of KOH with 20% concentration. In this study, activated carbon was characterized with a scanning electron microscopy, X-ray diffractometer, as well as Fourier-transformed infrared spectroscopy to analyze the crystalline structure, morphology, and functional groups. The end product of the activated carbon was utilized to adsorb Hg(II), Cd(II), as well as Pb(II) heavy metal ions. The adsorption capacity was then examined with Atomic Absorption Spectroscopy using an analytical method. This study’s result showed that the activated carbon has mesoporous characteristics with fine structure and morphology. Therefore, the material was suitable for use as heavy metal adsorbent, with high absorption efficiency of over 80%.

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Hypocenter dimension of 7.5 mw Palu earthquake using fractal approach 2

Hypocenter dimension of 7.5 mw Palu earthquake using fractal...

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2nd International Conference of Interdisciplinary Research on Green Environmental Approach for Sustainable Development, ICROEST 2020

作者： Rasimeng, Syamsurijal Alimuddin Rustadi Sinambela, Rudy Z. Mandang, Idris Bakri, Samsul Zaenudin, Ahmad Department of Geophysical Engineering Faculty of Engineering University of Lampung Indonesia Disaster and Mitigation Center Faculty of Engineering University of Lampung Indonesia Study Program of Geophysics Faculty of Mathematics and Natural Science Mulawarman University Indonesia Department of Forestry Graduate Program of Environmental Sciences University of Lampung Indonesia

Research on the Palu earthquake in the period of August to October 2018 has been carried out in the Palu Koro Fault (PKF) zone with a hypocenter of 5-20 km. This study aims to determine the fractal dimensions of these earthquakes based on the relationship between logarithmic frequency and earthquake magnitude correlation introduced by Gutenberg-Richter. Statistical correlation between logarithmic frequency and earthquake magnitude was calculated using the inversion approach. Based on the calculation results obtained fractal dimension value of 1.0378, which describes the seismicity pattern at a depth of 5-20 km. It indicates that the earthquakes triggered by the movement in rupture segments which seen as points along the PKF zone. © Published under licence by IOP Publishing Ltd.

关键词： Earthquakes

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A field test and performance evaluation of accelerated weight drop (awd250 v1.0) for shallow seismic survey

A field test and performance evaluation of accelerated weigh...

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Padjadjaran Earth Dialogues: International Symposium on geophysical Issues, PEDISGI 2018

作者： Bahar, Alfian Fatkhan Rachmat Sule, M. Geophysical Engineering Study Program Institut Teknologi Bandung Jalan Ganesha 10 Bandung40132 Indonesia

The acquisition of seismic reflection involves generating and recording seismic wave field on/near the surface of the earth. Success of producing high quality seismic data depend on choice of seismic sources. There are commonly seismic sources for land seismic surveys such as explosive sources, vibrators and Accelerated Weight Drop (AWD). In some cases, the use of explosive sources often faces many problems, especially related to the costs, permission and environmental issues. The use of vibrators is also similar, facing problems such as the availability of access roads, permits and the environment impact. The use of AWD seems to be a solution as an alternative seismic sources when explosive or vibroseis cannot be used for some reasons. In this research, we have designed and built a mechanical seismic source named AWD250V1.0. This hand-made AWD prototype was developed for shallow seismic surveys. To evaluate the performance of this tool and to improve the design of the prototype, a field tests have been carried out. The test was conducted in Ciparay village, Bandung Regency, West Java. The survey area is mostly paddy field with the near surface covered by clay and highly seismic attenuation. The purposes is simply whether AWD can work properly or not while maintaining data quality and safety standards. In addition, the test is intended to find out how deep penetration of seismic waves using this source. Seismic recorders used were 96 channels with interval between receivers was 10 meters. Findings showed that the deepest reflection can be seen around 450 millisecond or approximately 400 meters. To sum up, the device is work well and is able to produce good quality of seismic sources. The prototype can also meet design criteria that are repeatability, portability, economical and environmetal friendly. © Published under licence by IOP Publishing Ltd.

关键词： Seismic waves

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Liquefaction and normal fault in Talise Valangguni and Tanamodindi Villages of Palu City;a preliminary observation of impact MW 7.5 earthquake in 2018 at Central Sulawesi Province, Indonesia

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Journal of Physics: Conference Series 2021年第1期1763卷

作者： Abdullah A I Abdullah Geophysical Engineering Study Program Tadulako University Indonesia Geological Engineering Study Program Tadulako University Indonesia

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Sediment thickness mapping and soil classification using ellipticity inversion of Rayleigh wave in the eastern part of Mataram City, Indonesia

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Journal of Physics: Conference Series 2021年第1期1763卷

作者： I U Meidji M Rusydi Asrafil H Jayadi N Safitri Geology Engineering Study Program Tadulako University Indonesia Geophysical Engineering Study Program Tadulako University Indonesia

A soil's dynamic characteristics greatly influence earthquake potential damage inland. Subsurface investigations to determine the dynamic characteristics of the soil can minimize the risk of such damage. The sediment layer thickness is one of the parameters to assess the local geological character in response to an earthquake. Another parameter is Vs30 value, which is used to classify soil types as an indicator of soil response, which generally dominates ground motion amplification. In this study, the two parameters are analyzed to determine the potential for local damage in the event of an earthquake in the eastern area of Mataram City using the rayleigh wave inversion from microtremor data. The research area covers 3 districts, including Selaparang, Cakranegara, and Sandubaya Districts. The results showed that the value of the sediment thickness in the entire study area ranged from 12.78 m to 57.20 m. The value of Vs30 varies between 286 m/s to 866 m/s with the classification of rigid soils, very dense soils, and soft rocks and rocks. These results indicate that the study area in general experiences a large potential for damage if an earthquake occurs. This research is expected to be a reference for the spatial plan of Mataram City.

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