• Journal of the Earthquake Engineering Society of Korea
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• v.1 no.4
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• pp.29-35
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• 1997

The probabilistic seismic risk in Seoul Metropolitan Area $(atitude도 37.0^{circ}~37.8^{circ} N, longitude 126.5^{circ}~127.5^{circ} E)$ based on all Korean earthquake data of MM Intensity equal to or greater than V is evaluated by point source method. The seismic risk estimated from all data turned out to be lower than that from the data since the Choseon Dynasty during which seismic data appear to be rather complete. The damaging earthquake of peak horizontal ground acceleration greater than 0.1g turns out to occur with 90% probability of being exceeded in 200 years and 500 years when the data since Choseon Dynasty and all data are used, respectively.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2016.06a
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• pp.16-18
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• 2016

본 논문에서는 몽골 지역에 발생하는 지진이 대규모 집단 거주지 및 상업 지역인 울란바타르(Ulaanbaatar) 도심지역에 큰 피해를 주고 있는바, 지진재난경보시스템 개발하여 현장에 구축함으로써 신속히 지진발생 상황을 전파하여 몽골 국민의 생명을 보호하고 재산피해를 줄이는데 역할을 수행할 수 있다. 울란바타르 외곽에 지진파를 감지할 수 있는 지진센서를 설치하고, 지진파를 수집하여 분석하고 진도의 단계에 따라 이벤트를 발생한다. 지진의 세기에 따라 단계별 상황을 판단하고 시민들이 빠른 대피를 할 수 있도록 울란바타르 도심지역에 경보방송을 전달함으로써 지진 피해를 최소화 시킬 수 있다.

• Journal of KSNVE
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• v.5 no.1
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• pp.21-27
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• 1995

• Journal of the Korean Geotechnical Society
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• v.18 no.1
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• pp.101-112
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• 2002

In this study, a new methodology fur the assessment of liquefaction potential is proposed and characteristics of the proposed methodology are verified. The experimental parameter of this methodology, that is, the plastic shear strain trajectory, is compared with the dissipated energy. It is shown that this parameter can express the liquefaction behavior which is generated by excess pore water pressure. This methodology takes advantage of the shear strain time history determined from the site response analysis based on the real time history of earthquake. In this site response analysis, shock type and vibration type records of similar predominant frequency are inputted. The liquefaction safely factors based on the proposed methodology and Korean detailed assessment related to the classical method are calculated from the results of the site response analysis and laboratory dynamic tests. Through this study, it is found that the proposed methodology can not only simulate the liquefaction behavior of saturated soils hut also express the seismic characteristics reasonably : leading type, predominant frequency, maximum acceleration, duration time.

• Journal of the Korean earth science society
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• v.28 no.2
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• pp.202-213
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• 2007

The Odaesan earthquake $(M_L=4.8)$ occurred near Mt. Odae, Jinbu-Myon, Pyongchang-Gun, Kangwon Province on January 20, 2007. It has a shallow focal depth about 10 km. Its felt area covers most of the southern peninsula except some southern and western inland area. The maximum MM intensity was VI in the areas including Jinbu, Doam, Kangreung, Jumunjin, and Pyongchang. In these areas, there was a very strong shaking that caused several cracks on the walls of buildings and houses, slates falling off the roof, tiles being off the wall, things falling off the desk, and rock falling from the mountains. In order to get fault plane solutions, grid searches were performed by fitting distributions of P-wave first-motion polarities and SH/P amplitude ratios for each event. The results showed that the main shock represented right-lateral strike-slip sense and two aftershocks, reverse sense. It seems that the seismogenic fault may be the NNE-SSW trending Weoljeongsa fault near the epicenter based on the distribution of epicenters (foreshock, main shock, and aftershocks), damage area, and fault plane solution. The distribution of the epicenters indicates that the length of the subsurface rupture is estimated to be about 2 km.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.8 no.1
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• pp.97-102
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• 1988

The strain release associated with historical and instrumental earthquoke data are analyzed. In addition, the relationship between engineering intensity and cumulative frequency of earthquake occurrence is investigated. Based on the study, a seimic zoning map of the Korean peninsula is constructed. For each seismic zone, a peak ground acceleration value is determined for the aseismic designs of two types of structures. First type is general structures like buildings and the second type is special structures like nuclear power plants.

• Journal of the Society of Disaster Information
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• v.14 no.4
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• pp.440-449
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• 2018

Purpose: This study aims to design and verify an onsite EEWS that extracts the P-wave from a single seismic station and deduce the PGV. Method: The P-wave properties of Pd, Pv, and Pa were calculated by using 12 seismic waveform data extracted from historic seismic records in Korea, and the PGVs were computed using empirical equation on the P properties - PGV relationship and compared with the observed values. Results: Comparison of the observed and estimated PGVs within the alarm level shows the error rate of 86.7% as minimum. By reducing the PTW to 2 seconds, the alarm time can be shortened by 1 second and the seismic blind zone near the epicenter can be shortened by 6 Km. Conclusion: Through this study, we confirmed the availability of the on-site EEWS in Korea. For practical use, it is necessary to develop regression formula and algorithm reflect local effect in Korea by increasing the number of seismic waveform data through continuous observation, and to eliminate the noise from the site.

• Journal of the Earthquake Engineering Society of Korea
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• v.12 no.5
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• pp.31-38
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• 2008

Recently the necessity of time history analyses is increasing for the seismic analyses of a structure, and the seismic design provisions of IBC2003, ASCE and KBC2005 require the use of a minimum of seven earthquake records for the time history analyses. Earthquake records for the time history analyses could be selected from the database of the field-measured earthquake records having similar site conditions with the designed site, or from simulated sites satisfying the design spectrum. However, in this study seven earthquake records were generated using 50 earthquake records, classified as records measured at the rock, in the database of the Pacific Earthquake Research Center (PEER). Seven earthquake records were first selected by the least squares fitting method comparing the scaling factored response spectra with the specified design spectrum, and a family of seven artificial time history earthquake records was ultimately generated by multiplying scaling factors, which were calculated by the least squares fitting method and the SRSS averaging method, to the corresponding selected earthquake records.

• Proceedings of the Korea Water Resources Association Conference
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• 2012.05a
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• pp.79-82
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• 2012

최근 지진해일 발생으로 인한 막대한 피해로 인해 지진해일 방재에 대한 중요성이 높아지고 있다. 지진해일 방재연구는 주로 실제 발생하였던 역사지진해일과 발생가능성이 높은 가상의 지진해일에 대해 해당지역의 재해정보도를 제작하여, 지진해일 발생 시 인명 및 재산피해를 최소화 하는 것에 초점이 맞추어져 있다. 따라서 이번 연구에서는 이러한 재해정보도의 효율성을 높이기 위해 지진해일 발생 시 인명피해가 발생할 가능성이 높은 위험지역을 선정하였다. 지진해일 위험지역을 선정하기 위해 가상의 지진해일을 수치모의 하였으며, 지진해일 발생 시 인명피해가 발생할 수 있는 지진해일 범람 높이를 선정하여 선정한 기준 높이 이상의 범람이 발생할 확률을 계산하였다. 지진해일 수치모의는 지진해일 전파모의와 범람모의 과정으로 이루어진다. 지진해일 전파모형은 선형 Boussinesq 방정식을 지배방정식으로 사용하며, 지진해일 범람모형은 비선형 천수방정식을 지배방정식으로 사용하였다. 수치모의를 통해 주문진항에서의 가상의 지진해일에 대한 범람영역 및 범람 높이를 얻었다. 수치모의를 통해 얻어진 범람 데이터를 이용해 기준 높이 이상의 범람 발생 확률을 계산하였다. 확률 계산을 위해선 해당 데이터의 확률분포를 결정하여야 하기 때문에, 적합도 검정을 수행하였다. 이번 연구에서는 여러 가지 적합도 검정 기법 중 하나인 확률도시 상관계수 검정(Probability Plot Correlation Coefficient Test)을 사용하였으며, 범람 데이터의 확률분포로 Normal, Log-normal, Exponential, Gumbel 분포를 가정하여 검정을 수행하였다. 각 지점별로 확률도시 상관계수 검정을 수행하여, 해당 지점의 확률분포를 결정하였고, 각 지점별로 해당하는 확률분포의 누적확률분포 함수를 이용해 기준 높이 이상의 범람이 발생할 확률을 계산하였다. 얻어진 확률을 지도상에 도시하여 기준 높이 이상의 범람 발생 확률이 높은 지점을 주문진항에서의 지진해일에 대한 인명피해 발생 가능성이 높은 위험지역으로 선정하였다.

• The Science & Technology
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• v.30 no.3 s.334
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• pp.55-61
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• 1997

최근 한반도 주변인 중국과 일본 및 사할린에서 일어난 대지진은 충격적이다. 이것은 한반도를 중심으로 인접한 여러판의 새로운 지체구조력 운동이 활발하다는 것을 증명해준다. 지진이 발생할 때 신속ㆍ정확한 정보를 제공하여 응급 대피할 수 있도록 하는 연구와 대책이 절실하다.