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Full Waveform Inversion Using the Hypergradient Descent Method

Optimizing step length or learning rate is crucial for efficient gradient-based inversions, including seismic full waveform inversions and deep learning. Hypergradient descent methods, initially proposed for deep learning, update hyperparameters using gradient descent techniques. We applied the hypergradient descent method to update the step length in full waveform inversion. While this approach still requires selecting an appropriate learning rate for hypergradient descent, it eliminates the need to manually tune and schedule the step length in full waveform inversion. We implemented the hype...

Econ. Environ. Geol. 2024; 57(6): 665-680

Application of Machine-Learning for Detecting Gas Indicator Distribution from Seismic Data

The bright spot and seismic chimney, which are prominent gas indicators observed in seismic data, exhibit distinct geophysical features such as high amplitude, phase reversal, low continuity, and frequency attenuation. As a result, seismic attribute analysis has been widely applied to derive gas distributions within subsurface media. However, seismic attribute analysis has limitation that it is difficult to clearly distinguish gas indicators from other strata with similar geophysical properties. Therefore, this study proposes a machine-learning method to predict the distribution of bright spot...

Econ. Environ. Geol. 2024; 57(6): 681-699

Application of a Deep Learning Phase Picker to Improve the Performance of Deep Borehole Seismic Data Analysis

Deep learning has demonstrated significant advancements in various fields that previously required human intervention. In particular, artificial intelligence (AI) has shown superior efficiency in areas where it is difficult to define clear rules or theories, outperforming traditional methods. However, these technologies have the drawback of requiring huge amounts of training data. The field of seismology is particularly well-suited for the development and application of deep neural networks due to the vast amount of digital seismic data accumulated alongside the analysis of skilled professiona...

Econ. Environ. Geol. 2024; 57(6): 701-708

Geological Characteristics, Ore-forming Processes, and Mineral Resources of Rare Earth Element Deposits in Mongolia

This study investigates the geological characteristics, ore-forming processes, and mineral resources of rare earth element (REE) deposits in Mongolia. REE deposits in Mongolia are primarily associated with two distinct geological settings: Mesozoic carbonatites and Paleozoic peralkaline granitic rocks. Carbonatite-related deposits are found within alkaline silicate-carbonatite complexes in the Gobi-Tien Shan rift zone of southern Mongolia. These complexes consist of nepheline syenite and their volcanic equivalents. In these carbonatites, REE are mainly associated with bastnäsite, synchysi...

Econ. Environ. Geol. 2024; 57(6): 709-720

Manganese Mineralizations of West Africa: Geology, Genesis and Distribution

In this review paper, we present the compilation of research work carried out on eight (8) manganese mineralizations, which represent the main manganese mineralizations of the West African Craton (WAC) and its surrounding areas. These Mn mineralizations were selected based on bibliographic availability and the importance of their grade and extend. A compilation of data from outcrop description and mineralogical analyses allowed to highlight the emplacement of mineralizations, their origin and evolution within the WAC. These analyses made possible to make comparisons between the different manga...

Econ. Environ. Geol. 2024; 57(6): 721-734

Petrogenesis and Geochemical Evolution of Rocks and Pegmatites in Kwarra Area, Northcentral Nigeria: Implications for Rare Metal Mineralization

Although pegmatite rare metal deposits are significant sources of rare metals, their metallogenic mechanisms remain a topic of debate. Nigeria's Basement Complex and Younger Granite provinces have identified pegmatites, which comprise a variety of rock types. We classify pegmatites into two categories: quartz-muscovite pegmatite and quartz-feldspar pegmatite. The study area has three primary stress orientations: N-S, NE-SW, and NNE-SSW, with secondary trends of ENE-WSW and E-W. There are more high-ferromagnetic elements (HFS) in quartz-muscovite pegmatites than there are in the crust as a whol...

Econ. Environ. Geol. 2024; 57(6): 735-768

Early Permian to Late Triassic Metamorphism in the Southeastern Gyeonggi Massif (Wonju-Yeongwol-Hoengseong area): Implication for the Permian-Triassic Tectonic Evolution of the Central Part of the Korean Peninsula

In this study, we conducted metamorphic P-T estimation and zircon U-Pb age dating for the Chiaksan gneiss in the Wonju-Yeongwol-Hoengseong area in the southeastern Gyeonggi Massif to examine Permian-Triassic metamorphic events occurred in the region. The results of metamorphic P-T estimation using conventional geothermobarometer and pseudosection analysis show that the Chiaksan gneiss underwent intermediate-P/T (656-696°C/8.3-8.7 Kbar) and low-P/T (756-759°C/6.3-6.9 Kbar) metamorphism during prograde and peak metamorphic stages, respectively. After the peak metamorphism, the Chiaksan g...

Econ. Environ. Geol. 2024; 57(6): 769-792

Slip-sense Inversion Recorded in the Fault Rocks of the Northern Yangsan Fault, Yeonghae Area, Yeongdeok, South Korea

The Yangsan Fault is known to have experienced kinematic changes due to tectonic stress variations since its formation in the Late Cretaceous. However, direct kinematic evidence based on the microstructure of fault rocks is rare. In this study, we analyzed the fault rocks of the Yangsan Fault using core samples collected from Yeonghae-eup, Yeongdeok-gun, in Southeast Korea, and aimed to obtain kinematic information through observations of rock slab-scale and micro-scale structures. In the inclined core samples with a length of 73.2 meters, fault rocks appear over a width of approximately 25 me...

Econ. Environ. Geol. 2024; 57(6): 793-801

Optimum Conditions of Thermal Treatment for Mercury Contaminated Agricultural Soil in Abandoned Mine Areas

In this study, we investigated the feasibility and optimum treatment conditions (temperature and retention time) of thermal desorption for agricultural soil contaminated by mercury in an abandoned mine area. With a retention time of 2 hours, mercury concentration decreased as heating temperature, 100 ℃ to 700 ℃, increased. Eventually, a temperature of 200 ℃ with a retention time of 3 hours was suggested as the optimum condition of thermal desorption to meet the Korean environmental standard and maintain soil functions for agricultural use. 54 % of mercury existed as elemental mercury in ...

Econ. Environ. Geol. 2024; 57(6): 803-810

Geochemical Characteristics of the Taehwa River Water: Impacts of Weathering and Human Activities

This study systematically analyzed the geochemical characteristics of the Taehwa River water to examine the natural factors and human activities influencing changes in its major chemical composition. The Taehwa River flows through the major industrial city of Ulsan and eventually into the sea, where it is impacted by both anthropogenic pollution and natural processes such as rock weathering. In the upstream region, the weathering of igneous and sedimentary rocks plays a dominant role, resulting in high ratios of ions such as Ca, Mg, and HCO3. Additionally, the weathering of igneous rocks in th...

Econ. Environ. Geol. 2024; 57(6): 811-821

The Formation of Phosphate in Archaeological Site: Material Characteristics of Settlement Deposits from the Village Before the Construction of the Southern Wall of Wolseong, Gyeongju

A consolidated grayish-white layer was identified in the excavation site of land formation for settlements located beneath the southern wall of Wolseong, Gyeongju, the royal castle of the Silla Kingdom. Mineralogical and chemical analyses revealed high concentrations of nitrate, sulfate, and chloride within this layer. Although their mineral compositions were similar to that of the surrounding soil samples, significant differences were observed in the microstructure and chemical composition. The upper samples of the consolidated layer contained herbaceous plant remnants in soil minerals, while...

Econ. Environ. Geol. 2024; 57(6): 823-835

Current Issue

Special papers on "Applications of Data Science and Artificial Intelligence in Economic and Environmental Geology"

December 2024
Volume 57, Number 6
View Archives Current Issue
Special Research Paper on “Applications of Data Science and Artificial Intelligence in Economic and Environmental Geology”
Full Waveform Inversion Using the Hypergradient Descent Method

Jun Hyeon Jo, Wansoo Ha

Econ. Environ. Geol. 2024; 57(6): 665-680

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Special Research Paper on “Applications of Data Science and Artificial Intelligence in Economic and Environmental Geology”
Application of Machine-Learning for Detecting Gas Indicator Distribution from Seismic Data

탄성파 자료의 가스 지시자 분포 도출을 위한 기계 학습 활용

Jongpil Won, Hyunggu Jun

원종필 · 전형구

Econ. Environ. Geol. 2024; 57(6): 681-699

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Special Research Paper on “Applications of Data Science and Artificial Intelligence in Economic and Environmental Geology”
Application of a Deep Learning Phase Picker to Improve the Performance of Deep Borehole Seismic Data Analysis

심부 시추공 지진자료 분석 성능 향상을 위한 심층학습 위상발췌 기술의 활용

Yoontaek Hong, Dong-Hoon Sheen

홍윤택 · 신동훈

Econ. Environ. Geol. 2024; 57(6): 701-708

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Review

Review Article
Review on the Relative Sea-level Changes in the Yellow Sea during the Late Holocene

한반도 서해안의 후기 홀로세 해수면 변동 곡선에 대한 검토

Sung-Ja Choi

최성자

Econ. Environ. Geol. 2018; 51(5): 463-471

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Review Article
A Study on the Policy of New Government Science and Technology and the R&D Policy of Government Departments Related to Geoscience and Mineral Resources

신정부 과학기술 및 지질자원 관련 정부부처 R&D정책 분석

Eun-Young Ahn, Jun-Hee Bae, Ok-Sun Lee and Jae-Wook Lee

안은영 ·배준희 ·이옥선 ·이재욱

Econ. Environ. Geol. 2018; 51(3): 279-289

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Review Article
Analysis of Mineral Resource Exploration and Strategy in Australia

호주 광물자원탐사와 전략분석

Seong-Yong Kim and Chul-Ho Heo

김성용 ·허철호

Econ. Environ. Geol. 2018; 51(3): 291-307

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Review Article
A Review of Geochemical Factors Governing the Phase Transformation of Birnessite

버네사이트 상변화 반응의 지화학적 반응 조절인자 연구

Seonyi Namgung, Chul-Min Chon and Giehyeon Lee

남궁선이 ·전철민 ·이기현

Econ. Environ. Geol. 2017; 50(6): 545-554

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Research Paper
Aggregate of Korea in 2021

2021년도 국내 골재 수급 분석

Sei Sun Hong, Jin Young Lee

홍세선 · 이진영

Econ. Environ. Geol. 2023; 56(1): 87-101

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Research Paper
Revealing the Paleo-ocean Environment of OSM-XX in the Western Pacific Magellan Seamount with Mineralogical and Geochemical Properties of Ferromanganese Crust

서태평양 마젤란해산군 OSM-XX 해저산 망간각의 광물학적, 지화학적 특성과 고해양 고환경 복원 연구

Jinsub Park, Kiho Yang

박진섭 · 양기호

Econ. Environ. Geol. 2023; 56(1): 55-63

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Research Paper
The Role of Organic Matter in Gold Occurrence: Insights from Western Mecsek Uranium Ore Deposit

Medet Junussov, Ferenc Mádai, János Földessy, Mária Hámor-Vidó

Econ. Environ. Geol. 2024; 57(4): 371-386

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Special Review on “Geological and Environmental Sciences for Sustainable Nuclear Energy”
Groundwater and Soil Pollution Caused by Forest Fires, and Its Effects on the Distribution and Transport of Radionuclides in Subsurface Environments: Review

산불에 의한 지하수 토양 환경오염과 방사성 물질 분포 및 거동 영향 고찰

Hyojin Bae, Sungwook Choung, Jungsun Oh, Jina Jeong

배효진 · 정성욱 · 오정선 · 정진아

Econ. Environ. Geol. 2023; 56(5): 501-514

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Research Paper
Machine Learning for Flood Prediction in Indonesia: Providing Online Access for Disaster Management Control

Reta L. Puspasari, Daeung Yoon, Hyun Kim, Kyoung-Woong Kim

Econ. Environ. Geol. 2023; 56(1): 65-73

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Review
Review of Domestic Research Trends on Layered Double Hydroxide (LDH) Materials: Based on Research Articles in Korean Citation Index (KCI)

이중층수산화물(layered double hydroxide, LDH) 소재의 국내 연구동향 리뷰: 한국학술지인용색인(KCI)에 발표된 논문을 대상으로

Seon Yong Lee, YoungJae Kim, Young Jae Lee

이선용 · 김영재 · 이영재

Econ. Environ. Geol. 2023; 56(1): 23-53

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Review
A Comprehensive Review of Geological CO₂ Sequestration in Basalt Formations

현무암 CO₂ 지중저장 해외 연구 사례 조사 및 타당성 분석

Hyunjeong Jeon, Hyung Chul Shin, Tae Kwon Yun, Weon Shik Han, Jaehoon Jeong, Jaehwii Gwag

전현정 · 신형철 · 윤태권 · 한원식 · 정재훈 · 곽재휘

Econ. Environ. Geol. 2023; 56(3): 311-330

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Research Paper
Revealing the Paleo-ocean Environment of OSM-XX in the Western Pacific Magellan Seamount with Mineralogical and Geochemical Properties of Ferromanganese Crust

서태평양 마젤란해산군 OSM-XX 해저산 망간각의 광물학적, 지화학적 특성과 고해양 고환경 복원 연구

Jinsub Park, Kiho Yang

박진섭 · 양기호

Econ. Environ. Geol. 2023; 56(1): 55-63

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Aims and Scope

KSEEG Journal

The Economic and Environmental Geology (E2G) is an official bimonthly journal of the KSEEG (Korean Society of Economic and Environmental Geology) and publishes original research articles, communications, and reviews in a broadly defined area of geology with emphasis on natural resources and environmental issues. The E2G is covered in the abstract and citation database by Scopus®, Web of Science (ESCI), Crossref®, and the Korea Citation Index (KCI). Full texts are freely available at http://www.kseeg.org/main.html

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