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A Study on Development of an Earthquake Ground-motion Database Based on the Korean National Seismic Network

국가지진관측망 기반 지진동 데이터베이스 개발 연구

  • Choi, Sae-Woon (School of Earth and Environmental Sciences, Seoul National University) ;
  • Rhie, Junkee (School of Earth and Environmental Sciences, Seoul National University) ;
  • Lee, Sang-Hyun (School of Earth and Environmental Sciences, Seoul National University) ;
  • Kang, Tae-Seob (Department of Earth and Environmental Sciences, Pukyong National University)
  • 최세운 (서울대학교 지구환경과학부) ;
  • 이준기 (서울대학교 지구환경과학부) ;
  • 이상현 (서울대학교 지구환경과학부) ;
  • 강태섭 (부경대학교 지구환경과학과)
  • Received : 2020.07.29
  • Accepted : 2020.10.08
  • Published : 2020.11.01

Abstract

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, ML 4.8), the 9.12 Gyeongju earthquake (Sep. 12, 2016, ML 5.8), and the Pohang earthquake (Nov. 15, 2017, ML 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 ML 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.

Keywords

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