Ground motion prediction equation for the Kathmandu Valley, Nepal based on strong motion records during the 2015 Gorkha Nepal earthquake sequence. Issue 135 (August 2020)

• Record Type: Journal Article
• Authors: Mori, Takuho; Shigefuji, Michiko; Bijukchhen, Subeg; Kanno, Tatsuo; Takai, Nobuo
• Is Part Of: Soil dynamics and earthquake engineering. Issue 135(2020)
• Publication Date: 2020-08
• Subjects: 2015 Gorkha Nepal earthquake sequence -- Long-period ground motion -- Kathmandu Valley -- Site amplification -- Ground motion prediction equation -- Bedrock depth; Soil dynamics -- Periodicals; Earthquake engineering -- Periodicals; Sols -- Dynamique -- Périodiques; Génie parasismique -- Périodiques; 624.176205
• DOI: 10.1016/j.soildyn.2020.106208
• Languages: English
• ISSNs: 0267-7261

Abstract

Abstract: Single-site ground motion prediction equations (GMPEs) for the acceleration response spectra of each site in the Kathmandu Valley was constructed using strong motion records of magnitude 5.0 through 7.3 the 2015 Gorkha Nepal earthquake aftershocks observed at eight sites in the Kathmandu Valley. The regression coefficient for the site term has a strong correlation with the bedrock depth at each site in the Kathmandu Valley. Therefore, a new GMPE applicable to the whole Kathmandu Valley in the long-period range of 1–10 s was generalized using the bedrock depth as a parameter. We applied this GMPE to the largest aftershock. Consequently, at each sedimentary station, the residuals of the predicted value by GMPE are smaller than those predicted by the existing GMPE, and the peaks of the observed response spectra are reproduced well. Highlights: Long-period ground motions of the 2015 Gorkha Nepal earthquake sequence in the Kathmandu Valley. We constructed the GMPE for the Kathmandu Valley in the long-period range. The regression coefficient for the site term was made by the bedrock depth.