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Surface Rupture Hazard of Palu-Koro Fault in Palu City
Full text linkThe Palu-Koro fault surface rupture, the latest active fault trace, provides valuable geological evidence and a chance to study its geometry, including strike length and damage zone width. Direct measurements indicate a primary north-northwest orientation, ranging from N314oE to N357oE, with a slip value of 2.3 – 5 m. The central part of Palu City experienced the most significant displacement. The surface rupture damage effect on the active Palu City fault spans 11 to 56 m, perpendicular to the fault line, causing substantial damage to buildings, shifting foundations, and altering roads. Liquefaction effects like sand boils, cracks, and stagnant water occurred. No buildings or infrastructure in the damaged zone remain in good condition, categorizing the area as a high-hazard zone. Based on geotechnical engineering and building structure assessments, continuing to construct buildings along the fault path is strongly discouraged
Identification of Hot Fluid Pathways in Jatimulyo Village, South Lampung Using Magnetic Method
Full text linkGeothermal energy originates from Earth's core heat, creating a hydrothermal system. Surface manifestations, like hot water, hold potential for geo-tourism. Detecting this system underground necessitates a comprehensive study. Geophysical methods, such as magnetics, can be used to predict hot fluid pathways and identify structural and alteration zones. This study aims to use the magnetic method to locate the outflow pathway in the Jatimulyo village, Jati Agung sub-district, South Lampung. Results reveal an anomaly in the form of a fault structure acting as a pathway for hot water. The distant hot spring lacks pluton granite and exhibits lower temperatures. The findings suggest a low magnetic anomaly along the outflow path, attributed to the loss of magnetic properties in heated rocks. Geological data indicates a northwest-southeast fault in the western part of the area, which may influence the fluid pathway
Characteristics of Rock Layers as Aquifers in Tamalanrea Region
Full text linkGroundwater can be used as a form of fulfilling needs, such as making wells for shallow groundwater (surface water) and deep groundwater (aquifers). This study aims to determine the subsurface resistivity of the study area by calculating and modeling the results of geoelectrical measurements as well as information on the groundwater-bearing rock layers. Geoelectric measurements use the "Schlumberger" method then the data is processed by the "Res2DinV" program. Measurement points were in 3 places in the Tamanalrea area of Makassar City. The results found 6 subsurface layers, namely soil layers, tuff as shallow aquifers (freshwater), tuff as shallow aquifers (brackish), tuff as shallow aquifers (freshwater), hard volcanic breccias (massive), tuff as aquifers (freshwater) with prospects for exploited. The lithology is dominated by volcanic rocks consisting of water-saturated tuff rocks characterized by low resistivity values and volcanic breccia rocks have undergone weathering and massive conditions with high resistivity values
Soil Porosity Conditions in Flood-Prone Areas of the Prosperous Swamp of Bengkulu City Based on Geoelectrical Measurement
Full text linkSurface porosity conditions in part of flood-prone areas at Rawa Makmur Village have been mapped from the surface to a depth of 30 meters. The aims of this research are to identify the infiltration of soil which is described by variations in resistivity and rock porosity values. It is obtained from the 1D geoelectric method using Vertical Electrical Sounding and as many as 10 measurement points. According to analysis, it is explained that Rawa Makmur area has low porosity and resistivity values. The porosity conditions in the observation point area were in very bad conditions. The infiltration process is very slow, causing the accumulation of a large amount of water mass and a fairly high pool of water. It also showed that the water flowing in this area was difficult to infiltrate, so it caused the Rawa Makmur area to become flooded when it rained
Modeling Analysis of Seepage Potential Based on Rock Resistivity Value in Geoelectric Method at Pamukkulu Dam
Full text linkAdministratively, the research area is the jurisdiction of the Pamukkulu Dam construction project of PT. Wijaya Karya in Kale Komara Village, Takalar Regency, South Sulawesi Province. The purpose of this study is to determine the condition of the subsurface rock and the pattern and direction of seepage in the construction of the dam. The method used is the geophysical method with geoelectric measurements. The condition of the rocks below the surface in the study area can be interpreted based on the results of observations and resistivity tests where breccia and basalt rock types are on a resistivity scale of >= 100 ohm.m. From the results of modeling with the voxler application, the direction of seepage in the study area starts from the East and Northeast and leads predominantly to the Northwest and Southwest
ZnO-Mn nanoparticles synthesized by pulsed laser ablation in liquid for photocatalytic degradation of Rhodamine B
Full text linkRhodamine B is a synthetic dye in the form of a powder, generally used for the purpose of changing colors in textile and paper factories. Rhodamine B is a chemical that is dangerous, absolutely should not be mixed in food, beverages and cosmetics, besides that rhodamine also has toxic properties so it must be degraded to reduce its toxicity. This research uses ZnO/Mn material which is synthesized using laser ablation in liquid (PLAL) technique as the degradation of rhodamine B waste. ZnO/Mn photocatalyst against rhodamine B dye. The results of the FE-SEM show that with the addition of Mn doping, the bond between the particles is getting better. ZnO/Mn with a variation of 0.1 mM obtained the best results for degradation, namely 89.474%, and the energy gap was 3.3196 eV
The Identification of Earthquake Shake Levels in Palu City Based on Mw 6,8 Shakemap Scenario by Palu Koro Fault
No full textPalu city is an active earthquake region, mainly sourced from the activity of the Palu Koro Fault. Referring to the Mw7.4 Central of Sulawesi earthquake on September 28th, 2018 with ground shaking intensity reached VII-IX MMI level in Palu. As a supporting data and preparation of an earthquake contingency plan document in Palu City, we proposed 3 sources of earthquake scenarios in the Palu Koro fault at a depth of 11 km, namely Mw6.8 in the Palu City Segment with coordinates 119.830 E – 0.800 S, Mw 6.9 in the Saluki segment with coordinates 120.010 E - 1,250 S and Mw 7.1 in the Makassar Strait segment with coordinates 119.750 E – 0.380 S. The worst-case scenario is that the Mw6.8 earthquake in Palu City can reach VI-VIII MMI
Preparation of Pellet Biopolymer Polyvinyl Alcohol/Alginate/Gluataraldehyde Impregnated with Banana Peel Activated Carbon (BPAC)
Full text linkPellet Biopolymer Polyvinyl Alcohol/Alginate/Glutaraldehyde impregnated with BPAC has been successfully synthesized. The morphology of pellet biopolymer was observed using SEM and mechanical strength of pellet was investigated using Hydraulic Impact Resistance. The density of pellet was also investigated. The result shows that the pellets have a round shape, springy texture, and water content presence inside the pellet. Pellet biopolymer without BPAC have an white gel-like bead, pellet with 0.5 g of BPAC was dark gray, and pellet with 1 g of BPAC was light gray. The SEM image of pellet biopolymer with 0.5 g of BPAC shows that the BPAC existed on the surface of pellet biopolymer. However, the SEM image of pellet biopolymer with 1 g of BPAC shows that almost all of the BPAC coated into the pellet biopolymer. The obtained pellet biopolymer impregnated with BPAC could adsorb the copper (II) ion from aqueous solution
3D Deliniation of Geological Structure of Kepahiang Geothermal Area, Indonesia
No full text3D delineation of the geological structure of the Geothermal prospect area in Kepahiang Regency has been conducted. The purpose is to get an overview of the subsurface and geothermal system in Kepahiang and map the alteration zone. Forward modeling and inversion were performed on geomagnetic data measured using a Proton Precession Magnetometer. The results of the analysis found that geothermal field prospects are distributed in Babakan Bogor, Barat Wetan, Pematang Donok, Tangsi Duren, Sido Makmur, and Air Sempiang with an average reservoir depth of 900 m. Four types of rock formations were found including volcanic breccia rocks, basalt rocks, gabbro rocks, and altered rocks. The low anomalies located in Babakan Bogor, Barat Wetan, Kuto Rejo, Pematang Donok, Tangsi Baru, Sido Makmur, and Air Sempiang are thought to be caused by the active and inductively magnetized Musi Segment Fault due to the geothermal reservoir from the activities of Mount Kaba
Study of Microbial Fuel Cell Technology using Dangke, Whole Milk, and Whey Substrates
Full text linkResearch with the aim of utilizing and processing dangke, whole milk, and whey as substrates in Microbial Fuel Cell-based research has been successfully conducted. The substrates were placed in anode chamber and KMnO4 electrolyte solution was used in cathode chamber. The two chambers were then connected by a salt bridge. The Saccharomyces Cerevisiae microorganism was used as a catalyst compound. The highest voltage measurement results for each substrate were obtained at 659 mV for dangke, 670 mV for whole milk, and 998 mV for whey. The current measurement on each substrate of dangke, whole milk, and whey, respectively, it was 0.29 mA, 0.23 mA, and 0.37 mA. In general, the measurement results show that the MFC made using whey substrate has the best quality with a power density of 9.23 x 10-3 W/m2. Thus, whey can be considered a promising alternative source of electricity by converting organic compounds