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Application of the Onsite EEW Technology Using the P-Wave of Seismic Records in Korea

국내 지진관측기록의 P파를 이용한 지진현장경보기술 적용

  • Received : 2019.12.09
  • Accepted : 2020.03.25
  • Published : 2020.03.31

Abstract

Purpose: This study aims to derive a predictive empirical equation for PGV prediction from P-wave using earthquake records in Korea and to verify the reliability of Onsite EEW. Method: The noise of P wave is removed from the observations of 627 seismic events in Korea to derive an empirical equation with PGV on the base rock, and reliability of Onsite alarms is verified from comparing PGV's predictions and observations through simulation using the empirical equation. Result: P-waves were extracted using the Filter Picker from earthquake observation records that eliminated noises, a linear regression with PGV was used to derive a predictive empirical equation for Onsite EEW. Through the on-site warning simulation we could get a success rate of 80% within the MMI±1 error range above MMI IV or higher. Conclusion: Through this study, the design feasibility and performance of Onsite EEWS using domestic earthquake records were verified. In order to increase validity, additional medium-sized seismic observations from abroad are required, the mis-detection of P waves is controlled, and the effect of seismic amplification on the surface is required.

연구목적: 본 연구는 국내에서 발생한 지진관측기록의 P파 성분으로부터 PGV를 예측하기 위한 예측식을 도출하고 지진현장경보(Onsite EEW)신뢰성을 검증함을 목적으로 한다. 연구방법: 국내에서 발생한 627개 지진 이벤트에 대한 관측기록으로부터 P파 외의 잡음을 제거하여 기반암에서의 PGV와의 예측식을 도출하고, 이를 이용한 지진현장경보 시뮬레이션을 통해 PGV의 예측치와 관측치 비교로부터 신뢰성을 검증한다. 연구결과: P파 잡음을 제거한 지진 관측기록으로부터 Filter Picker를 사용하여 P파를 추출하고, PGV와의 회귀분석을 통해 지진현장경보를 위한 예측식을 도출했다. 현장경보 시뮬레이션 결과 경보대상 구간인 MMI IV 이상 구간에서 MMI±1 오차범위 내 80%의 성공률을 얻었다. 결론: 본 연구를 통해 국내 지진기록을 이용한 지진현장경보의 설계 가능성과 성능을 확인하였다. 유효성을 높이기 위해, 해외 지진다발지역의 중규모지진의 관측기록을 분석기록으로 추가하고, 오탐지 제어 및 지표에서의 지진파 증폭에 효과 구현이 필요하다.

Keywords

References

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