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A Damping Modification Factor Prediction Model for Horizontal Displacement Spectrum from Subduction Slab Earthquakes in Japan Accounting for Site Conditions by Zhou, Jun; Zhao, John X. is a Earth and Planetary Sciences article available to read on EtoBox.

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## ABSTRACT A damping modification factor (DMF) model without source and path parameters is presented in this article for subduction slab earthquakes in Japan, using a similar dataset in the Zhao, Jiang, et al. (2016) study. Site classes based on site periods were used as the site-effect proxy. DMF models were derived from spectra of 13 damping ratios and 34 spectral periods, and the DMF can be calculated for any damping ratio between 1% and 30% and at any spectral period between 0.03 and 5.0 s. A simple fourth-order polynomial for the logarithm of the spectral periods and a simple quadratic function of the logarithm of damping ratios were used to model the effects of spectral periods and damping ratios, respectively. The model satisfies boundary conditions that require the DMF values equal to 1.0 at very short spectral periods; at long spectral periods, the DMFs for different damping ratios appear to converge to 1.0 to satisfy the constant displacement spectrum at long periods. Model standard deviations are smaller than those for the ground-motion prediction equations. All standard deviations vary linearly with the increasing logarithm of damping ratios. The DMFs presented in this

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Author

Zhou, Jun; Zhao, John X.

Publisher

Seismological Society of America; Seismological Society; Seismological Society of America (SSA) (ISSN 0037-1106)

Published

2020

Language

EN

Field

Earth and Planetary Sciences (Physical Sciences)