Strong‐motion observations of recent interface earthquakes along the Chilean subduction zone are evaluated with two ground‐motion models (GMM). One GMM was developed with Chilean data and the other with global data. The GMM developed with local Chilean data is found to have an overall better prediction performance than the GMM developed using a global data set. Using residual analysis with the Chilean GMM as reference model due to its better performance, clear indications of an increase of short‐period radiation for deeper earthquakes in north and central Chile were found, which may be related to frictional features on the interface such as interseismic coupling, as found previously for other regions, such as Japan. Also, the Iquique earthquake, which featured a clear precursory slow‐slip event, exhibits mostly negative between‐event residuals at short periods for earthquakes before and after the mainshock, indicating predominantly weaker short‐period radiation. However, this trend is not observed in the aftershock sequence of the Illapel earthquake, which did not feature a significant slow‐slip event nor precursory seismicity in its rupture area. Finally, a poor predictive performance was found for the Chilean GMM in southern Chile, overpredicting most of the observations. Based on these results, it is proposed that future local GMMs should include corrections for depth, regional effects and include earthquakes from southern Chile, as new data are becoming available in this region.

中文翻译：

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智利俯冲带中度和大界面地震的地震动评估

使用两个地面运动模型（GMM）评估了智利俯冲带最近交界地震的强运动观测。一个GMM是使用智利数据开发的，另一个是使用全球数据开发的。发现使用本地智利数据开发的GMM的总体预测性能要优于使用全局数据集开发的GMM。通过使用智利GMM的残差分析作为参考模型，由于其具有更好的性能，因此发现了智利北部和中部深层地震的短周期辐射增加的明确迹象，这可能与界面之间的摩擦特征（如间震）有关耦合，如先前在其他地区（例如日本）所发现的。此外，伊基克（Iquique）地震的前身明显是缓慢的滑坡事件，在主震之前和之后的短时间内，地震之间的事件间残差大多呈负值，这表明短期辐射主要弱化了。但是，这种趋势在Illapel地震的余震序列中没有观察到，该地震序列没有明显的缓慢滑动事件，也没有破裂区域的前兆地震活动。最终，在智利南部发现了智利GMM的较差的预测性能，对大多数观测值进行了高估。根据这些结果，建议未来的当地GMM应包括深度，区域影响的校正，并包括来自智利南部的地震，因为该地区有新的数据可用。这种趋势在伊拉珀尔地震的余震序列中没有观察到，该地震的破裂区域既没有明显的慢滑事件，也没有先兆地震活动。最终，在智利南部发现了智利GMM的较差的预测性能，对大多数观测值进行了高估。根据这些结果，建议未来的当地GMM应包括深度，区域影响的校正，并包括来自智利南部的地震，因为该地区有新的数据可用。这种趋势在伊拉珀尔地震的余震序列中没有观察到，该地震的破裂区域既没有发生明显的慢滑事件，也没有先兆地震活动。最后，在智利南部发现了智利GMM的较差的预测性能，对大多数观测值进行了高估。根据这些结果，建议未来的当地GMM应包括深度，区域影响的校正，并包括来自智利南部的地震，因为该地区有新的数据可用。