• 한국지진공학회논문집
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• 제24권6호
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• pp.277-283
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• 2020

In order to improve the ground-motion prediction equation, which is an important factor in seismic hazard assessment, it is essential to obtain good quality seismic data for a region. The Korean Peninsula has an environment in which it is difficult to obtain strong ground motion data. However, because digital seismic observation networks have become denser since the mid-2000s and moderate earthquake events such as the Odaesan earthquake (Jan. 20, 2007, M_L 4.8), the 9.12 Gyeongju earthquake (Sep. 12, 2016, M_L 5.8), and the Pohang earthquake (Nov. 15, 2017, M_L 5.4) have occurred, some good empirical data on ground motion could have been accumulated. In this study, we tried to build a ground motion database that can be used for the development of the ground motion attenuation equation by collecting seismic data accumulated since the 2000s. The database was constructed in the form of a flat file with RotD50 peak ground acceleration, 5% damped pseudo-spectral acceleration, and meta information related to hypocenter, path, site, and data processing. The seismic data used were the velocity and accelerogram data for events over M_L 3.0 observed between 2003 and 2019 by the Korean National Seismic Network administered by the Korea Meteorological Administration. The final flat file contains 10,795 ground motion data items for 141 events. Although this study focuses mainly on organizing earthquake ground-motion waveforms and their data processing, it is thought that the study will contribute to reducing uncertainty in evaluating seismic hazard in the Korean Peninsula if detailed information about epicenters and stations is supplemented in the future.

• 한국방재학회 논문집
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• 제5권4호
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• pp.95-105
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• 2005

우리나라는 비교적 안정된 판 내부에 존재한다. 하지만, 1976년 안전지대로 평가된 중국 탕산지역의 대규모 지진이 발생한 것처럼 우리나라도 지진에 대해 안전한 지역이라고 단언할 수는 없다. 게다가, 지진학자들도 국내에서 중규모 이상의 지진발생 가능성이 높다고 지적하고 있다. 이러한, 지진은 자체를 예방할 수 없기 때문에 내진설계에 대한 연구와 지진재해 관리체계에 대한 연구가 전반적으로 이루어지고 있다. 그러나, 지진발생 시 초기 대응이나 수습과정에 대한 연구는 미비한 상태이며, 지진피해 평가시스템 구축을 위한 극소수의 연구가 진행되고 있는 실정이다. 따라서, 본 연구는 국내실정을 고려한 지진피해 평가시스템 구축을 위한 기초자료를 제시함을 목적으로 한다. 이를 위하여 강남구 비내진 철근콘크리트 아파트를 표준형 건축물로 선정하여 지진피해를 예측하고, 취약도 함수의 도출과 층간변위에 따른 피해평가를 행하여 HAZUS 프로그램 취약도 함수 적용결과와 비교 분석한다.

• 한국지진공학회논문집
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• 제19권6호
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• pp.265-271
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• 2015

The tsunami hazard analysis is performed for testing the application of probabilistic tsunami hazard analysis to nuclear power plant sites in the Korean Peninsula. Tsunami hazard analysis is based on the seismic hazard analysis. Probabilistic method is adopted for considering the uncertainties caused by insufficient information of tsunamigenic fault sources. Logic tree approach is used. Uljin nuclear power plant (NPP) site is selected for this study. The tsunamigenic fault sources in the western part of Japan (East Sea) are used for this study because those are well known fault sources in the East Sea and had several records of tsunami hazards. We have performed numerical simulations of tsunami propagation for those fault sources in the previous study. Therefore we use the wave parameters obtained from the previous study. We follow the method of probabilistic tsunami hazard analysis (PTHA) suggested by the atomic energy society of Japan (AESJ). Annual exceedance probabilities for wave height level are calculated for the site by using the information about the recurrence interval, the magnitude range, the wave parameters, the truncation of lognormal distribution of wave height, and the deviation based on the difference between simulation and record. Effects of each parameters on tsunami hazard are tested by the sensitivity analysis, which shows that the recurrence interval and the deviation dominantly affects the annual exceedance probability and the wave heigh level, respectively.

• 한국지반환경공학회 논문집
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• 제16권1호
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• pp.17-27
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• 2015

최근 우리 정부는 안전한 대한민국이라는 슬로건 아래 지진재해를 포함한 자연재해피해를 최소화하는데 많은 노력을 집중하고 있으며, 이를 위해 산사태 위험도와 액상화 위험도와 같은 지진 시 지반피해 GIS 시스템 데이터가 구축되고 있는 실정이다. 우리나라 전역을 포함하는 지진 시 액상화 위험도를 작성하기 위해서는 수많은 지반시추정보에 대한 적용성 검토가 필요하다. 본 연구에서는 액상화 위험도 작성을 위해 인구밀도가 높은 광역지역의 지반증폭계수를 검토하였으며 이를 위해 S시 522개 시추공지반 정보를 수집하여 지반응답해석을 수행하였다. 이때 지반분류는 지반정보의 불확실성을 고려하고자 현행 내진 설계기준에서 제안하고 있는 시추종료 깊이 이후의 지반 정보를 30m로 가정하는 경우와 지반정보의 오리지널 데이터 값만을 이용하는 경우로 나누어 비교하였으며, 타당성 검토 시에는 지반응답해석 결과에 대한 확률분포와 통계분석을 이용하여 수행하였다. 최종적으로 정규분포를 통한 신뢰도 50%, 70%, 90%에 대한 지반증폭계수를 도출하여 액상화 위험도를 도시하였으며, 이를 지반응답해석을 통해 도시한 LPI 액상화 위험도와 비교하여 가장 유사한 값을 추천하였다. 연구결과 제안된 지반증폭계수가 향후 국내 액상화에 대한 연구와 중진지역의 광역지역 액상화 위험도 작성에 큰 도움이 될 수 있을 것으로 기대한다.

• 한국방재학회 논문집
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• 제6권3호
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• pp.29-35
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• 2006

교량의 지진응답해석시 단면의 비선형 거동특성에 따른 휨변형을 정밀하게 구현하기 위해 섬유요소를 이용한 해석이 수행되었다. 2주형 다주교각을 섬유요소로 모델링하여 지진하중에 대한 비선형 정적해석을 수행하였으며 소성힌지 영역에서의 파괴 메카니즘을 분석하였다. 비선형 정적해석으로 얻어진 하중-변위 곡선을 이용하여 역량스펙트럼 방법에 의한 지진응답해석을 수행되었다. 또한 교량 전체 시스템을 섬유요소를 이용하여 모델링하고 동일한 응답스펙트럼을 가지는 지진파를 입력하여 비선형 시간이력 해석을 수행되었으며 이는 역량스펙트럼 방법과 유사한 결과를 보인다.

• 한국지반환경공학회 논문집
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• 제20권6호
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• pp.15-22
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• 2019

본 연구에서는 현장조사, 실내시험 및 문헌자료를 기초로 지진 시 산사태 발생 위험지 예측 모델인 Newmark displacement model을 이용하여 위험지를 예측하였다. Newmark displacement model은 주로 지진의 정보와 해당 지역의 사면의 정보를 통해 산정되며, 사면의 안전율은 산지 토사재해 예측 프로그램인 LSMAP의 결과를 활용하였다. 연구대상 지역으로 과거 산사태가 발생한 부산의 백양산 일대를 선정하였다. 산사태 발생 해석 결과 Newmark displacement model을 활용한 지진 시 산사태 위험지 예측이 지진 계수가 미적용된 LSMAP의 산사태 위험지 예측보다 약 1.15배 넓은 지역을 위험지역으로 예측하는 것으로 나타났다.

• Earthquakes and Structures
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• 제24권5호
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• pp.377-391
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• 2023

The high seismic risk has once again revealed in Türkiye with two major earthquakes that occurred on 06.02.2023, which took its place among the most destructive earthquakes in the last century. Totally, 65 earthquakes that occurred in the historical period in Türkiye were taken into account within the scope of this study. The seismic parameters were compared by considering the last two earthquake hazard maps for the epicenters of these earthquakes. Earthquake Intensity (I) of historical earthquakes were converted to Peak Ground Acceleration (PGA) by using suggested relations. Structural analyzes were performed for a sample reinforced-concrete building by using the obtained PGA's and predicted PGA's in the last two earthquake hazard maps. In the structural analysis, two different material groups such as low (C12-S220) and normal (C25-S420) were selected. As the material strength increased, the period value decreased, while the seismic capacity and stiffness increased. It has been determined that there are differences between the measured and proposed seismic risks for some earthquakes, and as a result, there are significant differences between the expected target displacement values from the structures. Therefore, it will not be possible to estimate the damage and to determine the building performance realistically. The main purpose of the study is to reveal whether the earthquake risk is adequately represented on seismic and structural parameters.

• 한국방재학회:학술대회논문집
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• 한국방재학회 2008년도 정기총회 및 학술발표대회
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• pp.13-18
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• 2008

The 2005 west off Fukuoka earthquake with Mjma 7.0 occurred in the vicinity of Fukuoka city with 1.4 million populations, which had been regarded as rather seismically inactive in Japan. The strong motion records by K-net indicated PGV of 64 cm/s in Fukuoka city and some condominium buildings sustained extensive non-structural damages. In this study, we conducted a questionnaire survey for residents of 8 condominium buildings located in the downtown area of Fukuoka city after the earthquake. The results indicate that damaged nonstructural walls and distorted doors disrupted evacuation route for many occupants, and furniture and content damage on upper floors became severer resulting in higher rates of human casualty. Earthquake preparedness for indoor safety was raised after the earthquake, though further safety measures can be advised. In the phase of post-earthquake emergency and restoration period, residents' management organizations play important roles, so that neighborhood activities to promote communication networks are important in urban environment with aging population.

• 한국방재학회:학술대회논문집
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• 한국방재학회 2008년도 정기총회 및 학술발표대회
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• pp.537-540
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• 2008

This paper reviews the operation standards and manuals of earthquake monitoring system for Gyungbu high speed railroad. The domestic earthquake monitoring system detects the acceleration data at the locations of lower part of pier and deck of viaducts and bridges, not like foreign system to do the surface ground accelerations. For the purpose of evaluating the behaviors of the domestic earthquake monitoring system, measured acceleration data on the Odaesan earthquake at Iwon viaduct were analysed. The values of maximum acceleration level of the viaduct were increased from 0.0089g(EW component) of the lower part of pier to 0.014g(EW component) on the deck of the viaduct. And also the predominant periods and frequencies were analysed by the frequency domain analysis.

• 한국방재학회:학술대회논문집
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• 한국방재학회 2008년도 정기총회 및 학술발표대회
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• pp.119-122
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• 2008

Recently, Geographical Information System (GIS) has been progressed in the fields of not only earth sciences and disaster problems, but also medical sciences, economical and social sciences. the southern region of Mid Niigata Region was attacked by intensive earthquake of M.6.8 on Richter Scale on October 23, 2004. The aim of this study was to improve efficiency of restoration operation for early victims relief. Significant issue is achieving the information processing required in restoration operation by spatial temporal information system.