Abstract

Ground motions are used as input for the response history analyses of a structure. However, the number of ground motions recorded at a site located in low-to-moderate seismic regions such as the Korean Peninsula is few. In this case, artificial ground motions need to be used, which can reflect the characteristics of source mechanism, travel path, and site geology. On 15 November, 2017, the Pohang earthquake, with a magnitude of 5.4 and a focal depth of 9 km, occurred near the city of Pohang. This earthquake caused the most significant economic loss among the earthquakes that occurred in the Korean Peninsula. During the Pohang earthquake, valuable ground motions were recorded at stations distributed in the Korean Peninsula. In this study, a ground motion model is proposed based on ground motions recorded during the 2017 Pohang earthquake. The accuracy of the proposed model is verified by comparing measured and simulated ground motions at 111 recording stations.

Highlights

  • The Korean Peninsula is located in stable continental regions about 400 km from the boundaries of four plates: the Philippine Sea, Pacific, North American, and Eurasian Plates [1,2]

  • Thecase model consisted of a stochastic model and a shaping window when simulating ground motions with the proposed numerical model, similar observations were made, which are not included in the paper

  • The model consisted of a stochastic point-source model and a shaping window model developed based on ground motions recorded at 111 stations during the 2017 Pohang earthquake

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Summary

Introduction

The Korean Peninsula is located in stable continental regions about 400 km from the boundaries of four plates: the Philippine Sea, Pacific, North American, and Eurasian Plates [1,2]. The Pohang earthquake, with a magnitude of 5.4 and focal depth of 9 km, occurred near the city of Pohang, located in the Korean South-East province. It is difficult to collect available ground motions recorded from mid- to large-size earthquakes that have occurred in sites located in low-to-moderate seismic regions. In this case, artificial ground motions can be simulated and used in seismic performance evaluation. To verify the accuracy of the proposed model, the key components of measured and simulated ground motions are compared, such as peak ground acceleration (PGA) and 5% damped pseudo. In order to develop the proper ground motion simulation model for the Korean Peninsula, this article organized three sections.

Ground
Stochastic Point-Source Model Estimation
The values of κ00 for estimated for stations individual
Distributions the values and
Shaping
10. Estimated shaping window and duration at the BUS2 the 2017
Ground Motion Simulation for the 2017 Pohang Earthquake
12. Recorded and simulated ground motion at sample stations:
13. Estimated
Conclusions
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