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http://dx.doi.org/10.5467/JKESS.2019.40.1.56

An Analysis of Intensity Attenuation Characteristics by Physics-based Strong Ground-Motion Simulation  

Kim, Su-Kyong (Department of Earth Science Education, Korea National University of Education)
Song, Seok Goo (Earthquake Research Center, Korea Institute of Geoscience and Mineral Resources (KIGAM))
Kyung, Jai Bok (Department of Earth Science Education, Korea National University of Education)
Publication Information
Journal of the Korean earth science society / v.40, no.1, 2019 , pp. 56-67 More about this Journal
Abstract
In this study, we analyzed the intensity attenuation for M 6.0, 6.5, and 7.0 earthquakes using the broadband strong ground motion simulation platform based on the physical seismic modeling developed by the US Southern California Earthquake Center (SCEC). The location of the earthquake was assumed to be near the epicenter of the 2016 M 5.8 Gyeongju earthquake, but two of the representative US regional models provided by the SCEC strong ground motion simulation platform were used for the propagation model. One is the Central and Eastern United States (CEUS) model representing the intraplate region, and the other is the LA Basin model representing the interplate region. Five modeling methodologies are presented in the version 16.5 of the simulation platform, and Song and Exsim models were used in this study. In the analysis, we found that different intensity attenuation patterns can be observed with the same magnitude of earthquakes, especially depending on the region (CEUS vs LA Basin). Given the same magnitude and distance, the instrumental intensity in the CEUS region (intraplate) could be larger by a unit of 2 than that in the LA Basin region (interplate). Given the difference of intensity attenuation patterns observed in the study, it is important to know the regional intensity attenuation characteristics to understand the accurate level of seismic hazard imposed in the Korean Peninsula. This study also shows the level of the uncertainty of intensity attenuation if region specific attenuation characteristics are not considered.
Keywords
seismic hazard; intensity attenuation; ground motion; physics-based earthquake modeling;
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