New intensity prediction equation is evaluated for Iran using isoseismal maps of 31 earthquakes with M_W 5.1–7.4 occurred from 1939 to 2017 including 7.3 destructive Sarpol-e Zahab earthquake on 12 November 2017. The obtained intensity prediction equation based on Modified Mercalli Intensity (MMI) scale for intensity range 4 to10 and distances less than 150 km is as follows: I = − 0.841 + 1.583 M_w − 1.344 ln\( \sqrt{R_{epi}^2+{h}^2} \) − 0.0027\( \sqrt{R_{epi}^2+{h}^2} \), where M_W is the moment magnitude, R_epi is the epicentral distance, and h is the hypocentral depth. The results show different distance-dependent intensity attenuation rate in comparison with previous studies for Iran and other regions of the world. The comparison of the obtained equation with other studies indicate differences that most probably originate from input data consisting of various earthquakes located at different seismotectonic regions in addition to different kind of construction and damage styles in the area under study which have been applied to assign the MMI values. This supports development of region-specific attenuation relationships for more accurate estimation of strong ground-shaking maps, which represent a useful tool for hazard and risk assessment.

中文翻译：

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伊朗的新强度预测方程

新强度预测方程使用的31级地震震线图与伊朗评价中号_W¯¯ 5.1-7.4从1939年发生2017包括关于2017年11月12日将所得到的强度预测方程基于改性麦加利烈强度（MMI 7.3破坏性萨尔波勒扎哈卜地震）强度范围4到10且距离小于150 km的比例如下所示：I = − 0.841 + 1.583 M _w − 1.344 ln \（\ sqrt {R_ {epi} ^ 2 + {h} ^ 2} \） − 0.0027 \（\ sqrt {R_ {epi} ^ 2 + {h} ^ 2} \），其中M _W是力矩大小，R _epi是震中距离，h是震中深度。结果表明，与之前针对伊朗和世界其他地区的研究相比，不同的距离相关强度衰减率有所不同。所得方程与其他研究的比较表明，差异很可能源自输入数据，这些输入数据由位于不同地震构造区域的各种地震以及研究区域中用于构造MMI的不同类型的构造和破坏形式构成价值观。这支持开发特定于区域的衰减关系，以便更准确地估计强烈的地面震动图，这是进行危险和风险评估的有用工具。