To study the engineering characteristics of sub-ground motions, three components of 120 ground motions on surface and in subsoil recorded by six CSMIP geotechnical arrays of the United States from 28 earthquakes were analyzed.

• 摘要为考察地下地震动的工程特性，选取美国加州强震观测计划(CSMIP)6个土工台阵的120条三分量地表和地下地震动为数据基础，分别对水平向和竖直向地震动的加速度幅值，规准反应谱，双规准反应谱，傅立叶谱，持时等工程特征进行了研究。