A5102715456- Seismology and Earthquake Studies
- earthquake and tectonic studies
- Earthquake Detection and Analysis
- Seismic Waves and Analysis
- Geological and Geochemical Analysis
- Seismic Imaging and Inversion Techniques
- High-pressure geophysics and materials
- Geophysical Methods and Applications
- Electromagnetic Simulation and Numerical Methods
- Earthquake and Disaster Impact Studies
- Geotechnical Engineering and Underground Structures
- Atomic and Subatomic Physics Research
- Earthquake and Tsunami Effects
- Subtitles and Audiovisual Media
- Geotechnical Engineering and Soil Mechanics
- Numerical methods in engineering
- Wireless Communication Networks Research
- Landslides and related hazards
- Color perception and design
- Non-Destructive Testing Techniques
- Microwave Engineering and Waveguides
- Advanced Wireless Network Optimization
- Advanced Wireless Communication Techniques
- Solid-state spectroscopy and crystallography
- Seismic Performance and Analysis
Korea Institute of Geoscience and Mineral Resources
2012-2025
Seoul National University
2010
ABSTRACT Accurate corner-frequency (fc) measurements are crucial for precise stress-drop (Δσ) estimates, essential understanding earthquake mechanics and predicting ground motions, directly impacting seismic hazard assessments. This study investigated fc variations six earthquakes (Mw 3.2–3.8) across different tectonic regions: two from the 2019 Ridgecrest sequence in California (R1 R2) four Korean Peninsula-the 2022 Goesan mainshock (GM) its foreshock (GF), 2020 Haenam (HM) during a...
Research Article| November 14, 2017 Spatiotemporal Distribution of Events during the First Three Months 2016 Gyeongju, Korea, Earthquake Sequence Minkyung Son; Son aEarthquake Center, Korea Institute Geoscience and Mineral Resources, Gwahang‐no 124, Yuseong‐gu, Daejeon 34132, Republic kersti@kigam.re.krnemex@kigam.re.krjinsoo@kigam.re.kr Search for other works by this author on: GSW Google Scholar Chang Soo Cho; Cho Jin Shin; Shin Hyun‐Me Rhee; Rhee bDepartment Geological Environment,...
Summary The 2011 Tohoku-Oki earthquake caused significant postseismic (PS) deformations in a broad region East Asia including the southern Korean Peninsula (SKP). In this study, we aim to better characterize PS SKP and understand underlying physical mechanisms for them using linear Maxwell viscoelastic numerical models. We computed annual mean velocities by applying extended trend modeling technique publicly available Global Navigation Satellite System data. then derived yearly deformation...
Abstract On October 28, 2022, a moment magnitude (Mw) 3.8 earthquake occurred in Goesan, South Korea, typically characterized as stable continental region. Herein, we analyze 42 earthquakes, including the Mw earthquake, largest foreshock (Mw 3.3), which preceded mainshock by 17 s, and aftershock 2.9). The primary aim of this study is to identify interactions among seismic events. To end, utilized permanent networks with closest station at 8.3 km from epicenter, temporary network deployed...
Abstract The 2017 Pohang earthquake (M w 5.4) is the largest associated with fluid injection activities. We report new characteristics of and propose a dislocation‐type model explaining previously reported observations. identify fault geometry by relocating hypocenters 1,132 events that occurred during first 3 months then resolve their source regions as northern, central, southern patches, based on event groups similar waveforms. spatial features these waveform groups, in addition to our...
요약: 탄성파 수치 모형 계산에 있어서 다양한 방법들이 개발되어 적용되었다. 최근에는 특히 있어 혁신적인 방법인 SEM (Spectral Element Method)가 사용되어 왔다. 이 방법은 지형을 자유롭게 표현하는데 유연한 유한요소법의 장점에 정확성을 높인 방법이다. 일반적으로 Weak Formulation 형태의 파동방정식에육면체 요소와 Gauss-Lobatto-Legendre 적분법을 적용한 방법이 널리 사용된다. 일반적인 SEM에서는 PML (PerfectlyMatched Layer)경계조건을 적용하기 어려워 속도-응력 변분식으로 파동방정식을 변경하였다. CFS-PML (Complexfrequency Shifted PML)경계조건을 ADE (Auxiliary Differential Equation)방정식으로 변경하여 파동방정식에적용함으로써 분리할 필요가 없는 PML을 계산 알고리듬을 구현하였다. 1차원 수치모형과 3차원수치모형 실험을 통하여 SEM에 비분리...
We performed seismic noise level analysis to access the proper functioning of 11 newly established stations in southeastern region Korea. One-hour long segments seismograms were selected from continuous data 3 elements for 61 days March 1, 2019. For each segment data, power spectral density (PSD) was estimated back ground periods ranging 0.02~100 s. The median levels (NLs) compared with new model (NNM) USGS and NLs station TJN installed a tunnel on granite basement. observed that...
탄성파의 수치 모델링은 유한한 경계에서 발생하는 인공적인 반사파의 제거를 위한 경계조건을 필요로 한다. 이 연구에서는 주파수영역의 탄성파 모델링에 CFS-PML (Complex Frequency Shifted-Perfectly Matched Layer) 적용하였다. 수치모델링 검증을 위해 Lamb's Problem의 해석해와 결과를 비교한 결과 일치하였다. 모형 내의 운동에너지, 최대크기오차, 그리고 스펙트럼오차를 통하여 CFS-PML경계조건이 기존의 흡수경계조건들 보다 유한경계에서 발생한 반사파를 효과적으로 제거할 수 있음을 확인하였다. CFS-PML경계조건의 변수 <TEX>${\kappa}_{max}$</TEX>와 <TEX>${\alpha}_{max}$</TEX>의 최적값은 운동에너지를 이용하여 산정할 있었다. 또한, 주파수에 따른 함수로 정의된 <TEX>${\alpha}_{max}$</TEX>를 변수로 갖는 변형된 CFS-PML경계조건을 제안하여 기존 PML경계조건,...
If local minima are present in a calculation of an objective function, it is difficult to identify subsurface information. Therefore, essential exploit new technique reduce the number seismic inversions. To make steepest descent direction head toward global minimum, we propose using full waveform inversion with filtering techniques. During process, allocated time window that includes corresponding highest amplitude each observed trace. In function L2 ‐ norm, data contained by only employed....