초록 ▼

O 안정적 지진관측망 및 지진 DB 운영
- 실시간 지진자료 획득율 98% 이상
- 13,360 회 자동 event 분석, 6,555 회 event 수동 분석
O 지진 모멘트 규모 결정 기술 개발
O 지진-음파 관측망 운영 및 인공지진 식별 기술 개발
- 철원, 간성, 백령도, 김포 공중음파 관측소 운영
- 480 회의 인공지진 기록 식별
O 지진 자료 수집 분석을 위한 KEMS 운영 및 up-grade
- 수 발신 시스템 이중화
- 통합 지진관측망 자료 취합 및 VPN을 통한 자료

O 안정적 지진관측망 및 지진 DB 운영
- 실시간 지진자료 획득율 98% 이상
- 13,360 회 자동 event 분석, 6,555 회 event 수동 분석
O 지진 모멘트 규모 결정 기술 개발
O 지진-음파 관측망 운영 및 인공지진 식별 기술 개발
- 철원, 간성, 백령도, 김포 공중음파 관측소 운영
- 480 회의 인공지진 기록 식별
O 지진 자료 수집 분석을 위한 KEMS 운영 및 up-grade
- 수 발신 시스템 이중화
- 통합 지진관측망 자료 취합 및 VPN을 통한 자료 전송 시험
O 광역 자치단체 가속도 관측망 시범 구축
O 시범 지역의 지진 재해 정량적 예측을 위한 구역화
- 지반 정보 시스템 구축 기법 개발
- 시범 지역에 대한 지반 정보 시스템 구축 및 지진 구역화

Abstract ▼

The first digital seismograph in Korea was installed by KIGAM at Gyeongsang Basin in southeast Korea in 1994. Since then, KIGAM has increased the number of local seismic stations and is now operating the seismic networks consisted of 35 seismic stations. One of the important roll of ERC at KIGAM is

The first digital seismograph in Korea was installed by KIGAM at Gyeongsang Basin in southeast Korea in 1994. Since then, KIGAM has increased the number of local seismic stations and is now operating the seismic networks consisted of 35 seismic stations. One of the important roll of ERC at KIGAM is also to accurately determine the earthquake parameters and to discriminate the earthquakes from the man made artificial events such as dynamite explosions, mining blasts, etc., KIGAM has been operating 4 seismo-acoustic stations(CHNAR, KSGAR, BRDAR, KMPAR).
In addition, KIGAM has developed the KISS(Korea Integrated Seismic System) for seismic data exchange in real time among four earthquake monitoring institutes: Korea Institute of Geoscience and Mineral Resources (KIGAM), Korea Meteorological Administration (KMA), Korea Electric Power Research Institute(KEPRI) and Korea Institute of Nuclear Safety (KINS). And it is also the responsibility of KIGAM to operate and maintain the KISS from 2002. Therefore it is very important to maintain the seismic stations as well as the KISS in stable state at all times without interruption at any times.
The aim of this research is twofold. The one is to develop necessary technologies for the stable operation of the seismic stations and KISS in terms of hardwares and softwares. The other is to develop technologies for the seismic hazard prediction in the viewpoint of geotechnical earthquake engineering. For this purpose, we need to enlarge the function of the KISS in order that we could share the velocity data as well as the acceleration data, which is more Important than the former for the earthquake disaster prevention together with the subsurface geotechnical characteristics.
To develop the standard of earthquake-proof design for Korean peninsula, proper earthquake database has been required. Because blast contamination is a major potential cause of error when estimating the seismicity of a specific region, discrimination method between artificial and natural events is essential. Although there are many techniques for discriminating a blast from an earthquake, no single one is recognized as a definitive method. Since 1999, the KIGAM has been operating seismo-acoustic arrays in the Korean Peninsula. Because artificial blasting can produce seismic and acoustic signals simultaneously, analysis of seismic-acoustic records can be applied to discriminate artificial events from natural earthquakes.
The seismo-acoustic analysis, associating seismic and acoustic signals, was applied to data from January to November 2007. During this period, 5,611 seismic events were analyzed by Korea Earthquake Monitoring System (KEMS). Of the seismic events, 595 seismic events were identified as surface explosions producing acoustic signals, which is corresponding to 10.6% of total seismic events in the Korean Peninsula. The seismo-acoustic analysis made it possible to monitor surface explosions spatially and temporally in the Korean Peninsula.
Earthquakes can be quantified in terms of energy release related to the fault dimensions, slip, and stress drop during the rupture duration. In general, a local magnitude scale ($M_L$) is used to quantify the size of earthquakes in a local seismic network. The MLscale is based on the amplitude measurements on seismograms in time domain. Since the seismograph system in a local seismic network varies from time to time and the measured amplitude is empirically corrected according to the epicentral distances as well as site-specific attenuation characteristics, the earthquake catalogues in the different networks can list different values of the ML scale even on the same event. Also because the ML scale is dependent on the maximum amplitude only on seismograms regardless of the earthquake size, the spectral characteristics of wavefield radiated from the dimensional sources of the fault rupture cannot be appropriately considered. This leads to saturation of the ML scale for large earthquakes. Alternatively, quantification of earthquake size based on frequency-domain measurements is relatively free from these limitations by analyzing the physical properties of the fault rupture recorded on seismograms; that is, the seismic moment of an earthquake is defined by the combination of the rupture area and stress drop, and can be determined from the displacement spectrum of seismograms. Then the moment magnitude, Mw, can be related to the seismic moment throughout logarithmic relationship which are chosen so that estimates of moment magnitude roughly agree with those using other magnitude scales such as the local magnitude (ML) Now it is widely accepted among most seismologists that the moment magnitude should be the prime magnitude scale to quantify an earthquake. Thus we investigate the use of the moment magnitude scale for local and regional earthquakes in and around the Korean peninsula for the purpose of equalizing the local magnitude scales that are listed on the Korean earthquake catalogue and of automating the determination of earthquake source parameters for rapid public announcement.
To estimate reliably the regional seismic responses and corresponding hazards which are influenced mainly by the subsurface geologic and dynamic characteristics, an integrated geo-knowledge based Geotechnical Information System (GTIS) within GIS framework was developed by introducing a couple of new concepts of the extended area containing the study area and the additional site visit. The GTIS was constructed to estimate site effects related to the earthquake hazards in a model area, Daejeon, which is located in the central part of the Korean peninsula and the hub of research and development. To build the GTIS for the model area, geotechnical data collections were performed and a walk-over site survey was additionally carried out to acquire surface geo-knowledge data in accordance with the procedure developed to build the GTIS. For practical applications of the GTIS used to estimate the site effects associated with the amplification of ground motion, seismic microzoning map of the characteristic site period was created and presented as a regional synthetic strategy addressing earthquake-induced hazards and conducting preliminary seismic design and performance evaluation.

목차 Contents

• 제 1 장 연구개발과제의 개요...16
• 제 2 장 국내외 기술개발 현황...18
• 제 3 장 연구개발수행 내용 및 결과...21
• 3-1. 안정적 지진관측망 및 실시간 지진 분석 DB 운영...21
• 3-2. 지진 모멘트 규모 결정...23
• 3-3. 지진-음파 관측망 운영 및 인공지진 식별...24
• 3-4. 통합 지진 관측망 운영 및 가속도 관측망 시범 구축...26
• 3-5. 정보 기술 기반의 지진 재해 정량적 예측...28
• 제 4 장 목표달성도 및 관련분야에의 기여도...30
• 제 5 장 연구개발 결과의 활용계획...32
• 제 6 장 연구개발 과정에서 수집한 해외과학기술정보...34
• 제 7 장 참고문헌...36
• 제 8 장 연구개발 수행 내용 및 결과...40
• 8-1. 지진 관측소 운영 및 자료 분석...40
• 8-1-1. KEMS를 통한 분석 결과...40
• 8-1-2. 지진관측소 운영 및 자료 수신율...45
• 8-1-3. 지진관측소 운영 및 유지 보수...69
• 8-1-4. 지진-음파 관측소 운영...74
• 8-2. 남한 지역 관측망 기록을 이용한 모멘트규모 결정...76
• 8-2-1. 규모의 결정...76
• 8-2-2. 모멘트 규모...76
• 8-2-3. 2007년 지진 모멘트규모 결정...77
• 8-3. 지진파-음파 자료 분석...80
• 8-3-1. 지진파-음파 분석을 통한 인공지진 식별...80
• 8-3-2. 인공지진 위치결정법과 계절에 따른 공중음파 주시변화...90
• 8-4. KEMS 분석시스템 운영...93
• 8-4-1. 개요...93
• 8-4-2. 네트워크 운영...93
• 8-4-3. KEMS 유지 보수 및 운영...97
• 8-4-4. 지진 기록계 연구...139
• 8-5. 지진 재해의 정량적 예측을 위한 지진 구역화...217
• 8-5-1. 개요...217
• 8-5-2. 지반 정보 시스템 구축 기법 개발...219
• 8-5-3. 대상 지역에 대한 지반 정보 시스템 구축...229
• 8-5-4. 지진 구역화를 통한 지진 재해의 정량적 예측...237
• 8-6. 지진 신속 대응 시스템을 위한 지방자치단체 지진가속도망 시범 구축...241
• 8-6-1. 개요...241
• 8-6-2. 실시간 계기 진도도 표출 시스템...242
• 8-6-3. 광역지방자치 단체 가속도관측시스템 구성...243
• 8-6-4. 광역지방자치 단체 가속도관측시스템 설치...245
• 부록 1. 2006년 지진의 모메트규모 결정을 위한 푸리에 진폭스펙트럼...246
• 부록 2. KEMS Event List...290