美国2014地震区划中采用的地震动衰减关系

Ground motion attenuation relationships adopted in 2014 update of the US National Seismic Hazard Maps

世界上地震区划方法正在发生变化,其中对地震动衰减的考虑已经有了明显的改变。简要述评美国2014版区划图编制中采用的地震动模型,强调了选取的标准,区分了美国西部、中东部和俯冲带区域。通过与2008版区划图采用的地震动模型比较,指出了新的特点和优势,可为我国下一代区划图的修编提供参考与借鉴。

The method to prepare seismic hazard map is changing now in the world, in which the consideration on ground motion attenuation is changed obviously. The ground motion attenuation relationship adopted in 2014 update of the United States seismic hazard maps is reviewed,The criteria to choose relations, discrimination of the attenua- tion in the Western United States, mid-east of United States and subduction zone, is emphasized. The new charac- teristics and advantages of the updated relations are pointed out by comparing with those adopted in 2008 version map, for reference in preparation of the next generation hazard map of China.