检索结果-内蒙古大学图书馆

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

作者： Laesanpura, Agus Afnimar Dahrin, Darharta Abdurachman, Dadi Geophysical Engineering Study Program Institut Teknologi Bandung Jl. Ganesha No.10 Bandung40132 Indonesia

The Lembang fault considering vulnerable because of the site is near downtown Bandung. The west Lembang segment is the rural area of Cibodas. The two opinions is emerging, become normal fault or strike slip fault, based on recent earthquake (2010 onward). The geology data show the structure is observed by the outstanding topographic extended about 20 km, with volcanic rock very dominant. The seismology data is analysed for year 2011 in Mw less than 3, and classical fault plane solution is obtained. The gravity data is better acquired than 0.1 mGal, with elevation precision better than 60 cm. The upward Continuation, and second vertical derivative, is applied on data, as well as modelling 2.5D. The section is presenting in one section only, while data is getting in larger area. The seismology data show mostly for event is strike slip although in several parts having event normal. The gravity data is not ideal as graben like structure but rather locally low about 10 mGal amplitude. The combining the two methods suggested the slip zone or sag pond is more possible for the local anomaly. Besides, the Lembang fault is extended toward north rather to west or south. © Published under licence by IOP Publishing Ltd.

关键词： Strike-slip faults

来源：评论

学校读者我要写书评

暂无评论

Seasonal variations in sediment characteristics at the estuary of Bengawan Solo river: A study of river branching and flow velocity influences

引用

AIP Conference Proceedings 2024年第1期3110卷

作者： Andi Patriadi Ria Asih Aryani Soemitro Dwa Desa Warnana Study Program of Civil Engineering Faculty of Engineering Universitas 17 Agustus 1945 Surabaya Surabaya Indonesia Department of Civil Engineering Faculty of Civil Planning and Geo Engineering Institut Teknologi Sepuluh Nopember Surabaya Indonesia Department of Geophysical Engineering Faculty of Civil Planning and Geo Engineering Institut Teknologi Sepuluh Nopember Surabaya Indonesia

This research investigates the dynamic of sediment deposition in estuaries, focusing on the role of river branching and flow velocity, aspects that have not been comprehensively studied before. The study assesses the variation in sediment deposition characteristics before and after a river branch over a year. Monthly bed sediment samples were taken for a period of one year, which included both the monsoon and dry season and were tested using sieve analysis for sediment classification. Flow velocity, previously modelled using HEC-RAS, was considered when evaluating sediment deposition patterns. Preliminary findings reveal a marked seasonal variation in sediment characteristics. During the monsoon season, sediments upstream of the river branch predominantly comprised medium-to fine-grained material. Conversely, downstream of the river branch, a similar sediment texture was observed primarily during the dry season. It is concluded that while the river branch plays a substantial role in dictating sediment deposition characteristics, the impact of flow velocity must also be acknowledged. This research, therefore, adds a new dimension to the understanding of sediment deposition patterns and characteristics in estuaries, particularly the interactive influence of seasonal variations, river branching and flow velocity. This can have important implications for estuarine ecosystem management and sediment-related hazard prediction.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Implications for fault locking south of Jakarta from an investigation of seismic activity along the Baribis fault, northwestern Java, Indonesia

引用

SCIENTIFIC REPORTS 2022年第1期12卷 1-10页

作者： Widiyantoro, S. Supendi, P. Ardianto, A. Baskara, A. W. Bacon, C. A. Damanik, R. Rawlinson, N. Gunawan, E. Sahara, D. P. Zulfakriza, Z. Husni, Y. M. Lesmana, A. Global Geophysics Research Group Faculty of Mining and Petroleum Engineering Institut Teknologi Bandung Bandung 40132 Indonesia Faculty of Engineering Maranatha Christian University Bandung 40164 Indonesia Agency for Meteorology Climatology and Geophysics (BMKG) Jakarta 10720 Indonesia Department of Earth Sciences Bullard Labs University of Cambridge Cambridge CB3 0EZ UK Geophysical Engineering Study Program Faculty of Mining and Petroleum Engineering Institut Teknologi Bandung Bandung 40132 Indonesia PT. Reasuransi Maipark Multivision Tower Menteng Atas Jakarta 12960 Indonesia

Recent borehole seismic deployments conducted along the Baribis Fault in northwestern Java reveal that it may be active. In this study, we exploit these data to locate proximal earthquakes using a relative relocation technique, estimate their moment magnitudes using a spectral fitting method and compute their focal mechanisms via waveform inversion. We observe that seismicity in the eastern part of the fault is significantly higher than in the west, where a previous GPS study of the region south of Jakarta demonstrated the existence of high compression rates. These observations imply that the western Baribis Fault is locked, and that neighbouring areas, including southern Jakarta and its surroundings, may be highly vulnerable to future sizeable earthquakes when accumulated elastic strain energy is eventually released during fault rupture. Significantly, the current generation of Indonesia's national hazard maps have not considered seismicity along the Baribis Fault. Our new results therefore call for an urgent reappraisal of the seismic hazard in northwestern Java that carefully takes into account the Baribis Fault and its earthquake potential, particularly in light of its proximity to Jakarta, a megacity that lies at the heart of one of the most densely populated islands in the world.

关键词：

来源：评论

学校读者我要写书评

暂无评论

2D modelling gravity methods for mapping subsurface basin of Bandar Lampung city

引用

AIP Conference Proceedings 2022年第1期2563卷

作者： Nandi Haerudin Rustadi Roniyus Marjunus Ahmad Zaenudin Aulia Kurniasih Istifani Ferucha Geophysical Engineering Study Program Universitas Lampung Jl. Sumantri Brodjonegoro No. 1 Bandar Lampung Lampung 35145 Indonesia

The rapid population growth rate in Bandar Lampung City has an impact on the rapidly increasing demand for groundwater. This study aims to map groundwater basins in the Bandar Lampung area. It is necessary to carry out management and monitoring to monitor the availability of groundwater in the research area with an understanding of the existence of basins in the research area. Mapping of the subsurface basin was carried out using the gravity method to see the distribution of gravity anomalies in the study area. The low Bouguer anomaly which forms a circular closed closure is interpreted as a subsurface basin zone which is assumed to be a groundwater basin flanked by bedrock heights indicated by high gravity anomalies. 2D modeling of the research area can also show the presence of a basin and elevation zone composed of 4 rock layers, namely andesite, sandy tuff, clay tuff, and lava (andesite-basalt). The Bandar Lampung Basin is identified as being in the eastern part of the study area.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Adaptive irregular grid of seismic tomography: A synthetic test

引用

AIP Conference Proceedings 2024年第1期3019卷

作者： I. Putu Raditya Ambara Putra David P. Sahara Wahyu Hidayat Sri Widiyantoro Suharsono Geophysical Engineering Study Program Faculty of Technology Mineral UPN Veteran Yogyakarta Special Region of Yogyakarta Indonesia Global Geophysics Research Group Faculty of Mining and Petroleum Engineering Institut Teknologi Bandung Bandung West Java Indonesia Faculty of Engineering Maranatha Christian University Bandung West Java Indonesia

Seismic tomography is a method that is widely applied to obtain seismic velocity structures below the surface. This method is applied to various cases, from global to regional scales, as well as local scales such as in the case of volcanoes, geothermal areas and underground mining. Until now, the grid form that is still widely used is the regular grid form. With a very rigid grid shape, it will be more difficult and inflexible to model the geometry of certain geological models that are very varied, even though mathematically there is no reason to avoid certain grid shapes and sizes. In order to minimize the uncertainty of the subsurface geological model grid, we developed a script to perform seismic tomography where the shape and size of the grid can be made irregular based on the Voronoi diagram. The number of grids in the inversion process can also adaptively increase or decrease based on the number of the raypath data. We then applied it to the synthetic crosshole tomography data and compared the results with the regular grid. With the irregular shape and size of the grid, better inversion results are obtained and are more suitable with the synthetic model.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Revealing the shear-wave velocity structure of Tangkuban Parahu Volcano, West Java, Indonesia using Ambient Noise Tomography

引用

Journal of Volcanology and Geothermal Research 2025年 465卷

作者： Aditya Lesmana Awali Priyono Andri D. Nugraha Zulfakriza Shindy Rosalia David P. Sahara Rexha Verdhora Ry Sri Widiyantoro Wahyu Hidayat Faiz Muttaqy Devy Kamil Syahbana Ahmad Basuki Kristianto Geophysical Engineering Study Program Faculty of Minning and Petroleum Engineering Institut Teknologi Bandung Bandung 40132 Indonesia Global Geophysics Research Group Faculty of Minning and Petroleum Engineering Institut Teknologi Bandung Bandung 40132 Indonesia Research Center for Disaster Mitigation Institut Teknologi Bandung Bandung 40132 Indonesia Faculty of Engineering Maranatha Christian University Bandung 40164 Indonesia Geophysical Engineering Study Program Faculty of Technology Mineral and Energy UPN Veteran Yogyakarta 55283 Indonesia Research Center for Geological Disaster National Research and Innovation Agency (BRIN) Bandung Indonesia Center for Volcanology and Geological Hazard Mitigation (CVGHM) Geological Agency (GA) Jalan Diponegoro No. 57 Bandung 40122 Indonesia

We present a shear-velocity model for the Tangkuban Parahu Volcano (TPV) using ambient seismic noise tomography. We used data from a three-month 55-temporary netwok deployed between October 2021 and February 2022. We cross-correlated the vertical components at each station to extract an empirical Green's function, to generate group velocity maps within the periodicity range of 1 to 6.5 s. We then construct a three-dimensional model of shear-wave velocity to a depth of 5 km below the summit. Our analysis revealed distinct patterns of high and low velocity values, associated with the presence of the old Sunda caldera, unmapped local structures, and surface geothermal manifestation around TPV. We identified low velocity zones indicative of shallow reservoirs and pathways for magma migration from the subsurface to surface crater. Additionally, high velocity zones observed, correspond to cooled magmatic bodies.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Geoelectrical Method for Detecting the Limit of Liquid Waste Flowing Below the Surface at Piyungan Landfill

引用

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

作者： H Jayadi M R Muin Sabhan I U Meidji Geological Engineering Study Program University of Tadulako Indonesia Geophysical Engineering Study Program University of Tadulako Indonesia Departement of Physics University of Tadulako Indonesia

Increasingly limited residential land in urban areas results in residents looking for and making settlements around landfills. This affects people's lives in fulfilling their daily needs, clean water. To meet the demand for clean water, some residents use well water as the primary drinking water source. Judging from the condition of the residential areas located in the landfill area, there may be an effect of waste, especially liquid waste, on well water sources. For this reason, research is carried out using the geoelectric method by combining two configurations, namely Schlumberger and dipole-dipole. So that it can provide an overview of the boundaries of liquid waste contaminants in the soil, which are associated with conductive fluids that affect the quality of clean water from residential areas around the landfill. In this study, it was found that the fluid flow associated with liquid waste has a lateral movement to the right with a depth of 24.5 meters.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Shear wave velocity analysis for site classification of Tadulako University using microtremor measurements

引用

AIP Conference Proceedings 2023年第1期2719卷

作者： Icha Untari Meidji Nurhayati Pimpilemba Hendrik Leopatty Mauludin Kurniawan Mustafa Ahmad Harsano Jayadi Physics Department Universitas Negeri Gorontalo Gorontalo Indonesia Agency for Meteorology Climatology and Geophysics (BMKG) Class 1 Palu Indonesia Geophysical Engineering Department University of Tadulako Palu Indonesia Geological Engineering Study Program University of Tadulako Palu Indonesia Doctoral Program of Physics Department ITS Surabaya Indonesia

Shear wave velocity (Vs30) is one of the local condition parameters often used to determine buildings’ vulnerability to potential damage if an earthquake occurs. This parameter is essential for planning and evaluation in infrastructure development. Tadulako University, which is repairing the building and the layout of the campus area after the September 28, 2018 earthquake, needs to consider the parameters of the shear wave. Measurements of the Vs30 value have been carried out at 20 points spread across Tadulako University using the microtremor method. The value of Vs30 is then estimated to determine the classification of the surface soil. The results obtained indicate that the variation in value is not too significant; it is between 424 m/s – 530 m/s. This value is included in the C class site and has very dense soil and soft rock soil profile classification. The highest value is in the southwest part, and the lowest value is in the northeast part.

关键词：

来源：评论

学校读者我要写书评

暂无评论

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

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

引用

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

来源：评论

学校读者我要写书评

暂无评论

A Non-Linear Method for Hypocenter Determination around Central and East Java Region: Preliminary Result 2

A Non-Linear Method for Hypocenter Determination around Cent...

引用

2nd Southeast Asian Conference on Geophysics, SEACG 2018

作者： Muttaqy, Faiz Dian Nugraha, Andri Puspito, Nanang T Supendi, Pepen Rosalia, Shindy Geophysical Engineering Study Program Faculty of Mining and Petroleum Engineering Institut Teknologi Bandung Indonesia Global Geophysics Research Group Faculty of Mining and Petroleum Engineering Institut Teknologi Bandung Indonesia Bandung Indonesia

Java Island is highly active tectonic zone and also has a complex geological system as a result of Indo-Australian plate that subducted under the Eurasian plate. This complexity produces many large and destructive earthquakes. Moreover, Java is a most densely populated region in Indonesia. The precise earthquake location can define and evaluate the seismic hazard in the area. In this study, we determined hypocenter location around the central and east Java region by using a non-linear method. We manually picked P-and S-wave arrival time recorded by BMKG network for the time period of 2009 to 2017. We used the minimum 1D seismic velocity model of ak135 to locate the events. We used some criteria for the determination of event location including (i) at least recorded by 4 station which has clear onset P and S arrival, and (ii) has magnitude (MW) > 3. The seismicity in the study area is controlled by subduction and many active faults distributed along the Java Island, also clustered in several areas such as Kendeng thrust, Opak river fault, Kebumen, Banyuwangi, and others. The result of this study indicates the accurately main shallow seismicity zones in central and eastern part of Java region, and also confirm the presence of active inland faults. As further studies, we will conduct 1D velocity modeling and relocate the hypocenters using an updated local 1D velocity model beneath the study area. © 2019 IOP Publishing Ltd. All rights reserved.

关键词： Earthquakes

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：