检索结果-内蒙古大学图书馆

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

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

Single microtremor method for estimating site fundamental frequency at a site in the historical city of Byblos-Lebanon 8

Single microtremor method for estimating site fundamental fr...

引用

8th Annual International Conference 2018 on Science and engineering, AIC-SE 2018

作者： Tumur-Uyal, N. Setiawan, B. Oucherif, M.S. Department of Geology and Geophysics National University of Mongolia Mongolia Mongolia Program Study of Geological Engineering Faculty of Engineering Syiah Kuala University Indonesia Geoexplo Cheraga Algiers Algeria

A single ambient noise measurement has been found to be useful in investigating the near-surface geology in particularly for estimating site fundamental frequency. This single microtremor method is very attractive and has been successfully applied in many projects as the method is non-destructive, low cost, feasible for urban environments, fast, and deep penetration. Furthermore, this single microtremor method has been successfully applied in many projects. This paper presents the application of the single microtremor method to estimate the site fundamental frequency at a site in the historical city of Byblos, Lebanon. Pre-processing of industrial origin detection was carried out. Several durations of the measurements were investigated to obtain the most stable results. The site fundamental frequency was validated using one-dimensional site response analysis. The results are presented in this paper. © Published under licence by IOP Publishing Ltd.

关键词： Deep penetration

来源：评论

学校读者我要写书评

暂无评论

Geochemical characterization of thermal water springs in Barasanga field, North Konawe, Southeast Sulawesi

引用

AIP Conference Proceedings 2023年第1期2595卷

作者： Emi Prasetyawati Umar Jamaluddin Alfian Nawir Muhammad Altin Massinai Muhammad Fauzy Ismullah Massinai Anshariah Mining Engineering Department Faculty of Industrial Technology Universitas Muslim Indonesia Makassar Indonesia Geological Engineering Study Program STT Migas Balikpapan STT Migas Balikpapan Balikpapan Indonesia Geophysics Department Faculty of Math and Natural Science Hasanuddin University Makassar Indonesia

The geochemical method is one of the methods used to know the characteristics of hot spring, and the estimation of subsurface temperature or geothermal reservoir. Analysis of chemical properties of hot springs through thermal chemistry by using trilinear diagram. The methods used are literature study and field observations such as mapping the distribution of hot water spring, titrimetric laboratory analysis, gravimetric, and spectrophotometer for the analysis of hot water spring through the geochemical approach in determining the type of hot water spring. The average temperature of 480C and pH of 7,85, clear color, smelled sulfur and taste salty. The result on the percentage value of the ion content in the hot springs samples that have been analyzed their chemical content, especially the anion content of CI, SO42−, and HCO3− CO32− indicates that hot spring type of Barasanga is a type of chloride. This is indicated by the large chloride ion content ranging from 85.486% to 90.627%.

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

Preliminary Gravity study of Pre-Tertiary and Tertiary Rock in Northern Kebumen, Central Java, Indonesia 2

Preliminary Gravity Study of Pre-Tertiary and Tertiary Rock ...

引用

2nd Southeast Asian Conference on geophysics, SEACG 2018

作者： Nizar Ahmady, Faridz Santoso, Djoko Geophysical Engineering Study Program Faculty of Mining and Petroleum Engineering Institut Teknologi Bandung Bandung40132 Indonesia Applied Geophysics Research Group Faculty of Mining and Petroleum Engineering Institut Teknologi Bandung Bandung40132 Indonesia

Luk Ulo Melange Complex is a Pre-Tertiary rock formation consisting of various lithological background and complicated geological structure. Located in Northern Kebumen Regency, this rock is originally interpreted as products of tectonic process caused by paleo-subduction between Indian Oceanic Plate beneath Eurasian Plate in Cretaceous age. According to previous study on geological surface investigation shows that the melange complex is tectonically overlain by Tertiary sedimentary formation. On the contrary, geophysical study of the subsurface condition of the area is still under discussion due to limited of measured data. In order to obtain detailed subsurface image, gravity profiling was measured and interpreted across both Tertiary and pre-Tertiary rock. Frequency domain filter and designed moving average filter were used to separate residual and regional anomaly. The results denote gravity value of residual anomaly varying from -5 to +5 mGal, while regional anomaly is ranging from 150-180 mGal respectively. The preliminary interpretation was developed by taking into account the geological information and also the data that was collected during field campaign. Overall, high gravity anomaly is interpreted as diabase intrusion in the middle of research area. Meanwhile, low gravity anomaly indicated clay rich rock material related to matrix content of Luk-Ulo Melange Complex in the northern area. © 2019 IOP Publishing Ltd. All rights reserved.

关键词： Frequency domain analysis

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

Integrated Pore Pressure Model Estimation – Case study of Jambi Sub-basin, South Sumatera, Indonesia

引用

IOP Conference Series: Earth and Environmental Science 2021年第1期873卷

作者： Ahmad Farhan Farabi Ignatius Sonny Winardhie Noor Cahyo Wibowo Geophysical Engineering Study Program Faculty of Mining and Petroleum Engineering Bandung Institute of Technology Bandung Indonesia Geophysics Division Pertamina Upstream Technical Center Jakarta Indonesia.

Pore pressure estimation is crucial in drilling wells for safety purposes also a very effective method for dealing with drilling accidents. Determination of overpressure is the main foundation in the evaluation to minimize the non-productive time (NPT). Here we present several models to generate pore pressure analysis of well from Jambi Sub-basin, South Sumatera, Indonesia. The model for estimation pore pressure is carried out by 3 methods: Eaton, Yan & Han, and Kan & Swan. Those methods will be compared to gain a more accurate model estimation within the study area. Kan and Swan's model show the best fit for estimation because this method is suitable for the formation of tester like MDT/DST on higher frequency with parameter of C1 = 0.001 and C2 = 0.0003 for Jambi Sub-basin. The velocity data to construct the 3D pore pressure model was also validated with well data using multi-attribute analysis. The multi-attribute analysis used 2 algorithms, namely step-wise regression and probabilistic neural network (PNN). The analysis show that PNN has a better correlation compared to step-wise regression. The analysis shows the overpressure zone depth is ranges from 1700 – 2000m on Gumai Formation with maximum pressure around 6500 psi. The peak of overpressure dominated by Gumai and Talang Akar formation is caused by the loading mechanism because the rate of sedimentation on thick shale sequence is higher than the rate of dewatering on those formations.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Identification of igneous rock distribution in Kalisonggo area using geomagnetic method

引用

Journal of Physics: Conference Series 2020年第1期1434卷

作者： Kurniawan, M Sismanto Rugayya, S Geophysics Engineering Study Program Tadulako University Palu Indonesia 94148 Geophysics Study Program Gadjah Mada University Yogyakarta Indonesia 55281 Physics Study Program Tadulako University Palu Indonesia 94148

Shallow intrusions of igneous rocks are often found in the Kalisonggo area and form a columnar joint. The presence of shallow intrusions of igneous rocks in the study area is closely related to Mount Mujil as an ancient volcanic system. This study aims to prove the existence of igneous intrusion and subsurface conditions using the geomagnetic method. First Horizontal Derivative (FHD) is used to determine the edge boundaries of the anomalous source of the rock’s magnetic field. Quantitative interpretation is done by using 2.5 D modeling to determine the distribution of igneous intrusion in the study area. The results of data processing show the total anomaly value in the study area has a range of values ranging from -400 nT to 600 nT. Whereas the local anomaly value that has been reduced to the equator has a range of values between 350 nT and the lowest -400 nT with a closed contour closure pattern between the high anomaly and the low anomaly. Based on the cross-section results of 2.5 D incision 1 and 2, there are 3 layers of rock in the presence of boulder lava andesite. The andesite lava has a susceptibility value of 0.00004 SI which penetrates the bedding above it. The top layer is soil with a susceptibility value of 0.00001 SI. The next layer is the andesite breccia rocks with a susceptibility value of 0.00003 SI. The third layer is sandstone with a susceptibility value of 0.000005 SI. The model shows that the andesitic lava lumps did not break through the basement, this is following Van Bemmelen’s opinion that igneous rock in Kalisonggo is an avalanche.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Coupled Hydraulic and Mechanics Finite Element Modeling of CO2 Injection into a Layered Isotropic Media Using FEHM 2

Coupled Hydraulic and Mechanics Finite Element Modeling of C...

引用

2nd Southeast Asian Conference on geophysics, SEACG 2018

作者： Haerusalam, Herdis Sahara, David P. Fatkhan Study Program of Geophysical Engineering Faculty of Mining and Petroleum Engineering Institut Teknologi Bandung Ganesha 10 Bandung40132 Indonesia Global Geophysics Research Group Faculty of Mining and Petroleum Engineering Insitut Teknologi Bandung Ganesha 19 Bandung40132 Indonesia Exploration and Engineering Seismology Research Group Faculty of Mining and Petroleum Engineering Institut Teknologi Bandung Ganesha 10 Bandung40132 Indonesia

CO2 injection into the hydrocarbon reservoir affects the subsurface mechanics and hydraulic condition. The injection has to be performed in a way that there will be no reservoir and/or top seal failure. In such case, a simulation of the injected fluid propagation needs to be performed to see its possible impact to the top seal and existing major faults. We use finite element method to perform this injection simulation. In this research, we use open source software Finite Element Heat and Mass Transfer Code (FEHM) to simulate CO2 injection processes into reservoir. Subsurface geological model was constructed in a dimension of 3000 m (easting) x 3000 m (northing) x 2000 m (vertical). Vertically, it consists of four layers which represent upper layer (400 m), top seal (200 m), reservoir (900 m), and basement (500m). The grid around the reservoir rocks is refined to give more detail results. The open hole injection is set at 850 - 890 m depth, 1500 m easting and 1500 m northing. The material is assumed to be isotropic. The initial pressure and temperature increase as a function of depth with a pressure gradient of 0.00981 MPa/m and a temperature gradient of 0.025 degrees C/m. A vertical fault is modelled at 600 m eastern to the injection well. Injection process is carried out with 6 kg/s of CO2 injection with simulation time for ten years to see its impact to the fault. A vertical fault is The modelling results show that the CO2 injection will not reactivate the fault at 10 years. © 2019 IOP Publishing Ltd. All rights reserved.

关键词： Carbon dioxide

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：