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Refining the Regional Aftershocks Catalog of the Ambon Earthquake Mw 6.5 on 26 September 2019 using manual picking and a non-linear algorithm: Preliminary Result 9

Refining the Regional Aftershocks Catalog of the Ambon Earth...

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9th Asian Physics Symposium 2021, APS 2021

作者： Kamaruddin, B. Sahara, D.P. Halauwet, Y. Master Program of Geophysical Engineering Faculty of Mining and Petroleum Engineering Bandung Institute of Technology Indonesia Global Geophysics Research Group Faculty of Mining and Petroleum Engineering Bandung Institute of Technology Indonesia Earth Sciences Graduate Program Faculty of Earth Sciences and Technology Bandung Institute of Technology Indonesia Ternate Indonesia Ambon Indonesia

A destructive earthquake with magnitude Mw 6.5 occurred in Ambon, Indonesia, on 26 September 2019. This earthquake generated an aftershock sequence. In this study, we determined the location of the aftershock sequence using a non-linear algorithm from the Non-Linear Location (NonLinLoc) program. The catalog and waveform data were collected using 11 seismographs from BMKG regional network located around the Maluku archipelago. The data was recorded between 26 September and 18 October 2019. We have manually picked the P-and-S wave phase by using Seisgram2K software. In our preliminary result, we have located about 1,300 events of aftershock sequence with about 8,500 phases of P and S waves. Overall, the location of the focus depth of the aftershock sequence is dominantly distributed in between 5 - 25 km. Approximately ∼70% of the distribution of aftershock locations show a North-South (N-S) oriented pattern from west Seram to Ambon Islands. Meanwhile, about ∼20% of the aftershock's locations are distributed around Ambon Island. Our ongoing and future study is to determine accurate hypocentre location derived from double-difference hypocenter relocation with waveform cross-correlation. © Published under licence by IOP Publishing Ltd.

关键词： Location

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Modelling Background Seismicity Source for Probabilistic Seismic Hazard Analysis in Manado City, North Sulawesi 9

Modelling Background Seismicity Source for Probabilistic Sei...

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9th Asian Physics Symposium 2021, APS 2021

作者： Zulkifli, M. Triyoso, Wahyu Earth Sciences Graduate Program Faculty of Earth Sciences and Technology Bandung Institute of Technology Bandung Indonesia Global Geophysics Research Group Faculty of Mining and Petroleum Engineering Bandung Institute of Technology Bandung Indonesia Manado Indonesia

This study is used a background source model to calculate probabilistic seismic hazard analysis (PSHA) in Manado City. The gridded seismicity model is applied to characterize the background source model based on the seismicity rate on each grid 0.1 × 0.1 degrees. The results obtained from this study was the contribution of background sources for PSHA in Manado City for the probability of excedence 10% in 50 years is 0.18 ≥ g ≤ 0.19. © Published under licence by IOP Publishing Ltd.

关键词： Hazards

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Focal Mechanism Inversion on the Aftershock Sequence of the 25 October, 2010 Mw 7.8 Mentawai Earthquake: A Preliminary Result 9

Focal Mechanism Inversion on the Aftershock Sequence of the ...

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9th Asian Physics Symposium 2021, APS 2021

作者： Daniarsyad, Gatut Afnimar Master Program of Earth Sciences Faculty of Earth Sciences and Technology Bandung Institute of Technology Bandung Indonesia Global Geophysics Research Group Faculty of Mining and Petroleum Engineering Bandung Institute of Technology Bandung Indonesia Jakarta Indonesia

An Mw 7.8 tsunami earthquake ruptured the shallow part of the Mentawai megathrust on 25 October 2010 and generated a large tsunami that hit the Mentawai Islands. The earthquake continued a partial rupture sequence of the 2007 Mw 8.5 and 7.9 Bengkulu earthquake and the 2008 Mw 7.2 North Pagai earthquake. The aftershock activity gives the opportunity to investigate the geometry of the subduction interface, which is critical to understanding the propagation and termination of a large earthquake. However, it is necessary to have a precise location and mechanism of the aftershock distribution to clearly image the fault geometry. In this preliminary study, we have applied the Cut-and-Paste (CAP) focal mechanism inversion method to 20 aftershocks (M ≥ 4.9) of the 2010 Mentawai earthquake. The seismic waveforms recorded by the BMKG broadband seismic network on the regional distance were used in the inversion. They successfully obtained ten focal mechanisms more than that provided in the GCMT catalog. The result exhibits a distinctly different thrust and normal faulting aftershocks activity. The thrust faulting aftershocks are mainly distributed in the downdip of the Mentawai 2010 mainshock rupture, indicating the stresses that have not been released during the mainshock. In the shallow region near the trench, the aftershocks are dominated by a normal faulting mechanism which shows the tensile stress caused by the bending of the subducting plate. © Published under licence by IOP Publishing Ltd.

关键词： Tsunamis

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Geochemical Investigation on the Implications of Fluid Origin, Subsurface Processes and Recharge on the Tangkuban Perahu Geothermal Conceptual Model

SSRN

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SSRN 2022年

作者： Kobare, Nyora Donald Suryantini, Suryantini Iskandar, Irwan Geothermal Engineering Master’s Program Faculty of Mining and Petroleum Engineering Bandung Institute of Technology Jl. Ganesha 10 Bandung40132 Indonesia Department of Geosciences School of Mines and Geosciences University of Dar es Salaam 16103 Uvumbuzi Road Dar es Salaam Tanzania United Republic of Geological Engineering Study Program Faculty of Earth Sciences and Technology Bandung Institute of Technology Jl. Ganesha 10 Bandung40132 Indonesia

Tangkuban Perahu and nearby volcano-hosted geothermal prospects are believed to be important for future power generation in West Java, Indonesia. Recharge areas of these prospects and geothermal fluid evolution are not yet fully understood. The objectives of this investigation are to describe the fluid origin, processes, and evolution of geothermal fluids in relation to the recharge and the conceptual model of the Tangkuban Perahu Geothermal Systems (TPGS). The investigation involved sampling and analysis of geothermal waters, rainwater, and gases collected in fumaroles and other manifestations around the TPGS. Isotopic results of δ18O and δ2H collected from thermal and rainwater indicate deep-circulating meteoric origin, at an infiltration altitude ranges between 753-850 m in low terrain. Meanwhile, the high-standing terrain indicates the recharge zone to be within the wall of the Sunda Caldera and mountain slopes. Chondrite normalized patterns reveal an overall flat trendline that suggests the enrichment of Lower Rare Earth Elements (LREEs) in the central part of Tangkuban Perahu which is derived from the magmatic influx. The non-atmospheric gases origin was diagnosed by the lower N2/Ar (≤ 38) and is characterized of meteoric origin. The positive δ18O shifts from Ciater (CT), Batu Gede (BG), and Domas crater (KwD) geothermal waters samples comparatively to local meteoric lines are influenced by the interaction with wall rocks or magmatic influx. In these geothermal systems, the meteoric water infiltrated to the depth is heated, mixed with near-surface water, and followed by partial discharge as thermal springs along faults. © 2022, The Authors. All rights reserved.

关键词： Partial discharges

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Response analysis of groundwater-bearing layers in bandung groundwater basin due to variations of potential ground motions from Lembang fault

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AIP Conference Proceedings 2023年第1期2598卷

作者： M. F. N. Putra L. E. Widodo Graduate Student of Groundwater Engineering Program Faculty of Earth Science and Technology Bandung Institute of Technology Bandung Indonesia Research Group on Earth Resources Exploration Faculty of Mining and Petroleum Engineering Bandung Institute of Technology Bandung Indonesia

This paper focuses on the effects of potential ground motion variations in the range of 6.6–7.2 Mw from the Lembang Fault on the dynamic response of groundwater (Gw)-bearing laye...

This paper focuses on the effects of potential ground motion variations in the range of 6.6–7.2 Mw from the Lembang Fault on the dynamic response of groundwater (Gw)-bearing layers in the bandung Groundwater Basin. The dynamic response of the soil deposits is considered as a one-dimensional model due to the vertical shear wave propagation therein, influenced by local soil conditions or properties that are linear viscoelastic with variable damping. Meanwhile, the bedrock is considered an elastic medium upon which the shear wave propagates due to ground motion. The ground motion may cause the liquefaction of Gw-bearing layers near the bedrock with intensities starting from 6.8 Mw. Ground motions in the range of 6.6–7.2 Mw can cause peak ground acceleration at the ground surface ranging between 0.15–0.25 gal.

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3D model of Krakatau volcano subsurface structure based on gravity data 1

3D model of Krakatau volcano subsurface structure based on g...

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1st International Seminar on Science and technology 2018, ISST 2018

作者： Oemaiya, D.V. Santoso, D. Geophysical Engineering Study Program Faculty of Mining and Petroleum Engineering Institute of Technology Bandung Indonesia Applied and Exploration Geophysics Research Group Faculty of Mining and Petroleum Engineering Institute Technology Bandung Indonesia

Krakatau is one of the volcano in Indonesia which has the destructive paroxysmal eruption. Eruption on 1883 was estimated had VEI of 6. The eruption was recorded as one among some most violent volcanic eruption event in the world. Gravity method is one of the geophysical methods that could delineate the subsurface structure base on density variation. Therefore, the objectives of this research are to reconstruct the 3D subsurface structure of the Krakatau volcano especially the approximate location and dimension of the magma chamber. The subsurface model of Krakatau was done by 3D modelling using residual anomaly map. In order to develop the status of magma chamber model, the available information on the geological map of Krakatau and surrounding area was used. Besides that, some information relative to the volcano such as the information derived from earthquake wave attenuation were utilized. The result of the study shows that position its volcano magma chamber is not directly vertical or oblique under the volcano crater and it has multiple chambers which trending northwest-southeast. © 2019 IOP Publishing Ltd. All rights reserved.

关键词： Volcanoes

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Preliminary formulation of non-linear consolidation coefficients for unsaturated soil

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AIP Conference Proceedings 2024年第1期3019卷

作者： Aris Rinaldi Lilik Eko Widodo Reza Adhi Fajar Junior Water Resources Expert Technical Implementation Unit for Dam Engineering Ministry of Public Works and Housing Gedung Balai Teknik Bendungan. Jl Sapta Taruna Raya Jakarta Selatan 12310 Indonesia Research Group of Earth Resource Exploration Faculty of Mining and Petroleum Engineering Bandung Institute of Technology Jl. Ganesha No. 10 Bandung 40132 Indonesia Postgraduate Student of Doctoral Program Mining Engineering Bandung Institute of Technology Hydrogeology Lab. Jl. Ganesha No. 10 Bandung 40132 Indonesia

The water content is the amount of water contained in the medium – in this case, soil. The water contained in the soil represents soil condition, from the surface down to the ground. The surface position of the land to the groundwater table is referred to as the vadose zone, while the region below the groundwater level is called the saturated soil zone. The capillary fringe is a transitional zone between the vadose zone and the saturated soil zone. The unsaturated zone is defined as the part of the vadose zone between the ground surface and the capillary fringe. Distribution of water content in the soil is closely related to infiltration and consolidation processes. Infiltration is the process of water flow from the surface into the ground, while consolidation is the process of water dissipation from the soil pore medium due to the loading that causing a decline in volume or the soil pore cavity. Infiltration and consolidation are closely related to the compositional changes in water and air content of the soil. Groundwater scientific developments, in terms of engineering, science and technology, have been impactful. This research involves the investigation of a correlation between the distribution of water content and unsaturated consolidation and is expected to offer new insights in groundwater science.

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Development of unconventional method for mapping the surface hydrothermal alteration in Wayang Windu geothermal field

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AIP Conference Proceedings 2021年第1期2363卷

作者： Syafrizal Arie Naftali Hawu Hede Nurul Magrfirah 1Research Group of Earth Resource Exploration Faculty of Mining and Petroleum Engineering Institute of Technology Bandung Bandung 40132 Indonesia 2Master Program of Mining Engineering Faculty of Mining and Petroleum Engineering Institute of Technology Bandung Bandung 40132 Indonesia

The Wayang Windu geothermal field, a geothermal system zone that produces energy sources located in Pengalengan and Kertasari Districts, bandung Regency, West Java, Indonesia. The interpretation of surface minerals considers the alterations in volcanic rocks that occur at the research site. The distribution of surface minerals is closely related to the fracture pattern and the position of manifestation. The testing method that we used is the X-Ray diffraction method, which aimed to identify surface minerals. Silica (cristobalite, quartz, tridymite, opal), sulfate (alunite), oxide minerals, and clay minerals (kaolinite, smectite) are minerals that are often found on the surface. Native sulfur is often found in the primary manifestation of the crater. X-Ray Fluorescence is used to determine the main elements and traces in a sample. Andesite and andesite-basaltic-rock are rock types that are found in the research area. The XRF analysis results show that the SiO2 distribution is inversely proportional to the Al2O3, Fe2O3, and K2O distributions.

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Lithological distribution using band ratio technique in Southern Langkawi, Kedah, Malaysia

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Environmental science and pollution research international 2025年 2025 May 30页

作者： Yaokai Du Ying Jia Teoh Ismail Ahmad Abir Ramadhansyah Putra Jaya Yuniarti Ulfa Geophysics Program School of Physics Universiti Sains Malaysia Gelugor 11800 George Town Penang Malaysia. Geophysics Program School of Physics Universiti Sains Malaysia Gelugor 11800 George Town Penang Malaysia. tyj@usm.my. Faculty of Civil Engineering Technology Universiti Malaysia Pahang Al-Sultan Abdullah Lebuhraya Tun Razak 26300 Pekan Pahang Malaysia. Faculty of Earth Sciences and Technology Bandung Institute of Technology (ITB) Bandung 40132 Indonesia. Geological Engineering Programme Polytechnic of Geology and Mining "AGP" Bandung 40293 Indonesia.

Remote sensing techniques provide valuable insights into lithological interpretation and improve the accuracy of geological surveys. Due to the complex terrain of Langkawi Island, which is in the northwestern part of the Malay Peninsula, conducting detailed field investigations is challenging. However, advancements in technology have made remote sensing an effective method for surveying areas that are hard to access. In this study, Landsat 9 data, with a spatial resolution of 30 m, served as the primary source of information. The initial preprocessing of this data was done using ENVI software. After preprocessing, carefully selected band combinations and ratios were used to extract valuable geological insights. Remote sensing-based lithological interpretation is crucial in modern geological surveys. In this study, the band ratio technique was employed to map the lithological distribution. This study focused on the southern end of the Langkawi archipelago, specifically the Dayang Bunting and Tuba Islands, where the geological characteristics are of particular interest due to their unique geological history and topography. To achieve the objectives, the band ratio technique applied to satellite imagery allows for the derivation and analysis of the lithological distribution patterns on these islands. This study compared previously used band ratio combinations with those tested here to find the most effective for distinguishing lithology types. After testing 32 permutations, by comparing with the original geological map and combining previous field observations, the four most successful combinations were visually evaluated: RGB 2/3 2/5 2/6, 4/3 4/6 4/7, 2/4 2/6 2/7, and 5/2 5/6 5/7. On Dayang Bunting and Tuba Islands, these combinations revealed distinct colors, differentiating limestone, marble, and granite. This study enhances the understanding of lithological composition in Dayang Bunting and Tuba Islands and demonstrates the effectiveness of band ratio techniques fo

关键词： Band ratio technique Landsat 9 satellite sensor Langkawi Lithological mapping Remote sensing

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Modelling groundwater inflow into an underground mining from ore bodies hydraulically interconnected with surface water

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AIP Conference Proceedings 2021年第1期2363卷

作者： Dwi Tama Nurcahya Lilik Eko Widodo 1Mining Engineering Program Faculty of Mining and Petroleum Engineering Bandung Institute of Technology Indonesia 2Earth Resources Research Group Faculty of Mining and Petroleum Engineering Bandung Institute of Technology Indonesia

Underground mining of ore bodies that are hydraulically interconnected with surface water bodies is usually a serious problem, as it can cause groundwater inflow into the working front of underground mining with unlimited flow rates. Hydraulic interconnection between groundwater and surface water can occur through fracture networks or secondary structures in the direction of ore bodies, which usually have greater hydraulic conductivity than wall rocks, thus acting as conductors with surface water bodies. Under these conditions, groundwater inflow into the mining front is substantial. This study focuses on modelling groundwater inflow from ore bodies that are hydraulically interconnected with surface water bodies because they are accessed through cross-cuts or other underground mining infrastructures. Access to the ore body causes water to run out, which in this study is modelled as drainage. Several drainage models and the application of drainage in a finite element model of groundwater inflow are studied.

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