J Korean Soc Hazard Mitig 2018; 18(1): 57-67  https://doi.org/10.9798/KOSHAM.2018.18.1.57
Characteristics of the 2016 Gyeongju Earthquake Ground Motions: Comparison with Prediction Models
Bae, Sungjin*, Kim, Mirae**, Lee, Hyejin***, and Kim, Byungmin****
*Member, Undergraduate Student, School of Urban and Environmental Engineering, UNIST
**Master Student, School of Urban and Environmental Engineering, UNIST
***Student Member, Undergraduate Student, School of Urban and Environmental Engineering, UNIST
****Member, Assistant Professor, School of Urban and Environmental Engineering, UNIST
Correspondence to: Member, Assistant Professor, School of Urban and Environmental Engineering, UNIST (Tel: +82-52-217-2823, Fax: +82-52-217-2809, E-mail: byungmin.kim@unist.ac.kr)
Received: September 29, 2017; Revised: October 18, 2017; Accepted: November 20, 2017; Published online: January 31, 2018.
© The Korean Society of Hazard Mitigation. All rights reserved.

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract
The local magnitude 5.8 earthquake occurred with a foreshock with magnitude 5.1 and aftershocks with magnitudes of 4.5 and smaller. The main shock was the largest earthquake in Korea since 1978 when the modern instrumental recording began. The ground motions measured during the mainshock, foreshock, aftershocks of the 2016 Gyeongju earthquake are compared with those estimated by the NGA-W2 ground motion prediction equations (GMPEs) for the active crustal regions and the GMPE developed for Korea. Furthermore, ratios between spectral accelerations of the mainshock and foreshock and aftershock events, as well as ratios of vertical to horizontal ground motions are compared with various prediction models. Through the detailed comparison study, it is found that the ground motions by the Gyeongju earthquake are incredibly larger than any other prediction models at short periods and smaller than the predictions at period longer than 0.1s. Therefore, we concluded that development of new Korea GMPEs is necessary to prepare against earthquake risks in Korea.
Keywords: Gyeongju Earthquake, NGA-W2 GMPEs, Korea GMPEs, Aftershock Motion Prediction Model, Vertical to Horizontal Motion Model


This Article

e-submission

Archives

Indexed/Covered by