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http://dx.doi.org/10.5000/EESK.2018.22.3.129

Response Spectra of 2017 Pohang Earthquake and Comparison with Korean Standard Design Spectra  

Heo, Tae Min (Department of Civil and Environmental Engineering, Seoul National University)
Kim, Jung Han (School of Urban, Architecture and Civil Engineering, Pusan National University)
Lee, Jin Ho (Department of Ocean Engineering, Pukyong National University)
Kim, Jae Kwan (Department of Civil and Environmental Engineering, Seoul National University)
Publication Information
Journal of the Earthquake Engineering Society of Korea / v.22, no.3, 2018 , pp. 129-137 More about this Journal
Abstract
On November 15, 2017, Pohang earthquake occurred. Its local magnitude was announced to be $M_L=5.4$ by Korea Meteorological Administration (KMA). Ground motion data recorded at KMA stations were obtained from their data bases. From the data, horizontal and vertical response spectra, and V/H ratio were calculated. The horizontal spectra were defined as GMRotI50 spectra. From the statistical analysis of the GMRotI50 spectra, a mean plus one standard deviation spectrum in lognormal distribution is obtained. Regression analysis is performed on this curve to determine the shape of spectrum including transition periods. Applying the same procedure, the shape and transition periods of vertical spectrum were obtained. These results were compared with theKorean standard design spectra, which were developed from domestic and overseas intra-plate earthquake records, and Gyeongju earthquake response spectra. The response spectra of Pohang earthquake were found to be almost identical with the newly proposed design spectra. Even the V/H ratios showed good agreement. These results confirmed that the method adopted when developing the standard design spectra were valid and the developed design spectra were reliable.
Keywords
Pohang earthquake; Korean standard design spectra; Intra-plate earthquake; GMRotI50 spectrum; V/H ratio;
Citations & Related Records
Times Cited By KSCI : 4  (Citation Analysis)
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