• Title/Summary/Keyword: geophysical data

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Geostatistical Integration of Multi-Geophysical Data Measured at Different Ranges (측정 범위가 다른 다중 물리 탐사 자료의 지구통계학적 복합 해석)

  • Oh, Seok-Hoon
    • Geophysics and Geophysical Exploration
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    • v.12 no.4
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    • pp.309-315
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    • 2009
  • Integrated interpretation of multi-geophysical data has been continuously used in terms that it has provided more confident information than the result from single-geophysical data. Especially, geostatistical integration has its own superiority that it is possible to deal with spatial characteristics as well as physical properties of survey data and the process of integration is clear. This paper further extends the previous work of geostatistical inversion for integrated interpretation. In this paper, we propose a new way of dealing with the case that the multi-geophysical data do not share the measurement range. According to the geostatistical kriging, the closer between the measurement points, the smaller kriging variance we get, and vice versa. We used this spatial properties as a weighting value to the process of geostatistical inversion for the geophysical data integration. An objective way to integrate different kinds of geophysical data measured at different ranges is provided with this algorithm.

Development of Geophysical Data Management System (물리탐사자료 데이터베이스 시스템 구축 연구)

  • Lee, Tai-Sup;Hwang, Hak-Soo;Sun, Hee-Duck;Koo, Sung-Bon;Song, Yaung-Soo
    • Geophysics and Geophysical Exploration
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    • v.3 no.1
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    • pp.25-32
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    • 2000
  • The geophysical data management system was developed to meet both the increasing demands of geophysical data in the practical application of civil engineering, underground water survey, and environmental problems and needs for digital archive and quality control of geophysical data. The system for a data manager is developed under Client/Server (C/S) environment. This manager system is characterized by a relational geophysical database system using MS SQL-server, standardization of geophysical data format, the development of C/S interface program for Windows environment, and the development of transfer program module for the searched data. The system developed for a general user under the internet environment is characterized by Web service (URL:http//geophy.kigam.re.kr) and the development of plug-in module to visualize geophysical image data.

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A Geophysical Data Management System using GIS (GIS를 이용한 물리탐사자료 관리시스템 개발)

  • Kim Ji-Young;Choi Eun-Young;Kim Tae-Hyun;Choi Sun-Young;Go Wa-Ra;Yoon Wang-Jung
    • Geophysics and Geophysical Exploration
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    • v.6 no.1
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    • pp.1-6
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    • 2003
  • As a consequence of geophysical surveys for large-scale constructions and ground investigations, huge amount of geophysical data are collected. However, due to the lack of the systematic management of such data, most of them are used temporarily and kept in dead storage, which in turn leads the abuse of social properties. To propose the solution of this kind of problem, geophysical data are kept in database using geographical information system (GIS). The introduction of GIS in geophysical data management allows the efficiency in data management and user-friendliness in data access. This data management system is especially appropriate for the many geological companies and the government organizations in systematic data management and sharing so that the time ,md financial expenses are greatly reduced. This system even provides the basic data services for the efficient development and conservation of the surface and underground spaces.

Preliminary Study on Joint Inversion of Geophysical Data (물리탐사자료 복합역산을 위한 예비연구)

  • Kim, Jung-Ho
    • 한국지구물리탐사학회:학술대회논문집
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    • 2007.06a
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    • pp.54-57
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    • 2007
  • Recently, multidimensional joint inversion of geophysical data based on fundamentally different physical properties has been actively studied. Joint inversion can provide a way to much more accurately image the subsurface structure. Through the joint inversion, furthermore, it is possible to directly estimate non-geophysical material properties from geophysical measurements. In this study, I derive the objective functions and normal equations of three different joint inversion approaches: one approach based on the structural similarity using cross-gradient, and the other two using the a priori information on the model parameters and the correlation between material properties. Since all the equations derived in this study are based on the same inversion method (smoothness constrained least-squares), it is possible to mix the joint inversion methods so as to produce a new joint inversion algorithm.

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Geostatistics for Bayesian interpretation of geophysical data

  • Oh Seokhoon;Lee Duk Kee;Yang Junmo;Youn Yong-Hoon
    • 한국지구물리탐사학회:학술대회논문집
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    • 2003.11a
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    • pp.340-343
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    • 2003
  • This study presents a practical procedure for the Bayesian inversion of geophysical data by Markov chain Monte Carlo (MCMC) sampling and geostatistics. We have applied geostatistical techniques for the acquisition of prior model information, and then the MCMC method was adopted to infer the characteristics of the marginal distributions of model parameters. For the Bayesian inversion of dipole-dipole array resistivity data, we have used the indicator kriging and simulation techniques to generate cumulative density functions from Schlumberger array resistivity data and well logging data, and obtained prior information by cokriging and simulations from covariogram models. The indicator approach makes it possible to incorporate non-parametric information into the probabilistic density function. We have also adopted the MCMC approach, based on Gibbs sampling, to examine the characteristics of a posteriori probability density function and the marginal distribution of each parameter. This approach provides an effective way to treat Bayesian inversion of geophysical data and reduce the non-uniqueness by incorporating various prior information.

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Downscaling of Geophysical Data for Enhanced Resolution by Geostatistical Approach (물리탐사 자료의 해상도 향상을 위한 지구통계학적 다운스케일링)

  • Oh, Seok-Hoon;Han, Seong-Mi
    • Journal of the Korean earth science society
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    • v.31 no.7
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    • pp.681-690
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    • 2010
  • Inversion result of geophysical data given as a block type was geostatistically simulated with borehole observation given as a point type and was applied to the rock classifying map. The geophysical data generally involved secondary information for the target material and were obtained for overall region. In contrast, borehole data provided direct information for the target material, but tended to be effective only for a narrow range of region and were dealt as a point type. Integrated simulation or kriging interpolation of these two different kinds of information required the covariance for point-point, point-block and block-block. Using the Bssim module included in SGeMS software, integrated result of geophysical data and borehole data were obtained. The results were then compared with the method of geostatistical inversion proposed by authors. Downscaling method used in this study showed relatively more flexible than the geostatistical inversion.

The Case Study on Application of 3 Dimensional Modeling Method with Geophysical Data (물리탐사 자료에 대한 3차원 지반 모델링 적용 사례 연구)

  • Heo, Seung;Park, Joon-Young;Do, Jung-Lok;Yoo, In-Kol
    • Geophysics and Geophysical Exploration
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    • v.11 no.3
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    • pp.221-229
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    • 2008
  • The three dimensional model method is widely applied in resource development for feasibility study, mine design, excavation planning and process management by constructing the database of various data in 3 dimensional space. Most of geophysical surveys for the purpose of engineering and resource development are performed in 2 dimensional line survey due to the restriction of the field situation, technical or economical situation and so on. The acquired geophysical data are used as the input for the 2 dimensional inversion under the 2 dimensional assumption. But the geophysical data are affected by 3 dimensional space. Therefore in order to reduce the error caused by 2 dimensional assumption, the 2 dimensional inversion result must be interpreted considering the additional information such as 3 dimensional topography, geological structure, borehole survey etc. The applicability and usability of 3 dimensional modeling method are studied by reviewing the case study to the geophysical data acquired in field of engineering and resource development.

Introduction to Geophysical Exploration Data Denoising using Deep Learning (심층 학습을 이용한 물리탐사 자료 잡음 제거 기술 소개)

  • Caesary, Desy;Cho, AHyun;Yu, Huieun;Joung, Inseok;Song, Seo Young;Cho, Sung Oh;Kim, Bitnarae;Nam, Myung Jin
    • Geophysics and Geophysical Exploration
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    • v.23 no.3
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    • pp.117-130
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    • 2020
  • Noises can distort acquired geophysical data, leading to their misinterpretation. Potential noises sources include anthropogenic activity, natural phenomena, and instrument noises. Conventional denoising methods such as wavelet transform and filtering techniques, are based on subjective human investigation, which is computationally inefficient and time-consuming. Recently, many researchers attempted to implement neural networks to efficiently remove noise from geophysical data. This study aims to review and analyze different types of neural networks, such as artificial neural networks, convolutional neural networks, autoencoders, residual networks, and wavelet neural networks, which are implemented to remove different types of noises including seismic, transient electromagnetic, ground-penetrating radar, and magnetotelluric surveys. The review analyzes and summarizes the key challenges in the removal of noise from geophysical data using neural network, while proposes and explains solutions to the challenges. The analysis support that the advancement in neural networks can be powerful denoising tools for geophysical data.

An Interpretation of Hydrogeologic Structure Using Geophysical Data from Chungwon Area, Chungcheongbuk-Do (물리탐사자료를 이용한 수리지질구조 해석 -충청북도 청원지역)

  • 송성호;정형재;권병두
    • Economic and Environmental Geology
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    • v.33 no.4
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    • pp.283-293
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    • 2000
  • A set of geophysical survey results over an area in Bookil-myun, Chungwon-Gun, Chungcheongbuk-Do is presented; resistivity logging, d.c. sounding, dipole-dipole resistivity, and controlled-source magnetotelluric (CSMT) surveys. These surveys were chosen in this research for the estimation of the basement depth and the delineation of the hydrogeologic structure over the survey area. The results provide an optimal input to a hydrogeologic modeling analysis using the strategies built in GIS software. A total of 14 lines of dipole-dipole resistivity surveys, 25 stations of d.c. sounding and 6 stations of CSMT sounding were performed. In addition 10 boreholes were chosen for resistivity logging to correlate the logs to the surface data. A quantitative information on the hydrogeologic structure over the area is provided by synthesizing the results from various geophysical data and attribute layers are constructed by utilizing a GIS software Arc/ Info. The constructed layers match well to the hydrogeologic structures, which were outlined from the drilling data. The methodology tested and adopted in this study would be useful for providing a more reliable input to the hydrogeologic model setup.

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