We present a damping modification factor (DMF) model for the total acceleration spectrum from subduction slab earthquakes. The model can be used for scaling a 5% damped design spectrum not associated with a particular earthquake that occurred in a subduction slab. The DMF model uses site‐period‐based site classes as the site‐effect proxy. DMF models were constructed based on the spectrum for 13 damping ratios and 34 spectral periods; the DMF values can be calculated for any damping ratio between 1% and 30% and at any spectral period between 0.03 and 5.0 s. At moderately long and long spectral periods, the DMF values for acceleration spectrum are similar to or less than those for the displacement spectrum for a damping ratio of less than 5%, whereas the DMF values for the acceleration spectrum are similar to or larger than those for the displacement spectrum when the damping ratio is more than 5%. The standard deviations for acceleration and displacement spectra are similar at short or moderately short spectral periods, but those for the acceleration spectrum are about twice those for the displacement spectrum at long spectral periods. All standard deviations decrease linearly with increasing damping ratios in the logarithm scale when the damping ratio is less than 5% and increase linearly with increasing damping ratios in a logarithm scale for the other damping ratios. A set of simple functions for calculating various standard deviations is presented. The spectra from the Zhao, Jiang, et al. (2016) study for slab events scaled by the DMF values for other damping ratios vary smoothly with spectral period and have a trough at short spectral periods for a large event, a short distance, and high damping ratios. The relatively large between‐event and within‐site standard deviations are from the source and path effects.

中文翻译：

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考虑场地条件的日本俯冲平板地震水平加速度谱的阻尼修正因子

我们为俯冲平板地震的总加速度谱提供了阻尼修正因子（DMF）模型。该模型可用于缩放与俯冲板中发生的特定地震无关的5％阻尼设计频谱。DMF模型使用基于站点周期的站点类作为站点效果代理。基于13个阻尼比和34个频谱周期的频谱构建了DMF模型。对于1％到30％之间的任何阻尼比以及0.03到5.0 s之间的任何频谱周期，都可以计算DMF值。在适度的长频谱周期和长频谱周期中，阻尼比小于5％时，加速度谱的DMF值类似于或小于位移谱的DMF值，当阻尼比大于5％时，加速度谱的DMF值等于或大于位移谱的DMF值。加速度和位移光谱的标准偏差在短或中等短的光谱周期内相似，但加速度光谱的标准偏差大约是长光谱周期的位移谱的标准偏差的两倍。当阻尼比小于5％时，所有标准偏差都随着对数比例中的阻尼比的增加而线性减小，而对于其他阻尼比，所有标准偏差都随着对数比例中的阻尼比的增加而线性增加。提出了一组用于计算各种标准偏差的简单函数。赵江等人的光谱。（2016年）对平板事件的研究，通过其他阻尼比的DMF值进行缩放，随频谱周期的变化而变化，对于大事件，短距离和高阻尼比而言，在短频谱周期内会出现波谷。事件之间和站点内的标准偏差相对较大是源和路径的影响。