New empirical relations between macroseismic intensity and ground motion parameters including peak ground acceleration and velocity are developed using strong ground motion data and Modified Mercalli Intensity (MMI) information from earthquakes within Iran plateau. The strong motion data consists of 116 three-component waveforms of 23 earthquakes with Mw 5.1–7.3 occurred from 1977 to 2017. The intensity values for each ground motion record were assigned considering the location of accelerograph stations on the isoseismal maps. Simple predictive equations are obtained by fitting a linear model to the mean peak ground motion values applying least squares regression. However, visual inspection of residuals shows magnitude and distance dependency for this set of equations. Improved relationships between ground motion and intensity are derived by comprising magnitude and distance terms as predictive variables. The refined ground motion to intensity conversion equations show smaller variability than simple linear equations in predicting MMI values. Both proposed models are compared with similar relationships in Iran and other regions of the world. The observed discrepancies in relationships may reflect the differences in input data, especially the macroseismic intensity assignments as well as regional variability. The proposed relations can be used for rapid hazard assessments and loss estimation in Iran and surrounding regions.

中文翻译：

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伊朗的地震动强度转换方程

大地震强度与地面运动参数（包括峰值地面加速度和速度）之间的新经验关系是使用强地面运动数据和来自伊朗高原地震的修正麦卡利强度 (MMI) 信息开发的。强震数据由 1977 年至 2017 年发生的 23 次 Mw 5.1-7.3 地震的 116 个三分量波形组成。每个地震动记录的强度值是根据等震图上加速度计站的位置分配的。通过应用最小二乘回归将线性模型拟合到平均峰值地面运动值来获得简单的预测方程。然而，残差的目视检查显示了这组方程的大小和距离依赖性。通过将幅度和距离项作为预测变量来导出地震动和强度之间的改进关系。在预测 MMI 值时，改进的地面运动到强度转换方程显示出比简单线性方程更小的可变性。两种提议的模型都与伊朗和世界其他地区的类似关系进行了比较。观察到的关系差异可能反映了输入数据的差异，尤其是宏观地震强度分配以及区域变异性。提议的关系可用于伊朗和周边地区的快速危害评估和损失估计。在预测 MMI 值时，改进的地面运动到强度转换方程显示出比简单线性方程更小的可变性。两种提议的模型都与伊朗和世界其他地区的类似关系进行了比较。观察到的关系差异可能反映了输入数据的差异，尤其是宏观地震强度分配以及区域变异性。提议的关系可用于伊朗和周边地区的快速危害评估和损失估计。在预测 MMI 值时，改进的地面运动到强度转换方程显示出比简单线性方程更小的可变性。两种提议的模型都与伊朗和世界其他地区的类似关系进行了比较。观察到的关系差异可能反映了输入数据的差异，尤其是宏观地震强度分配以及区域变异性。提议的关系可用于伊朗和周边地区的快速危害评估和损失估计。