【摘要】 视波速是由地震动平动分量计算转动分量的重要参数,利用10个台站30条集集地震波加速度记录按文中所述方法得出该场地视波速,并与他人计算的汶川地震和美国西部地区的近场视波速进行了比较。比较结果表明,由集集地震的视波速曲线与他人用同样方法分别从汶川地震记录和美国地震记录得到的视波速大小与变化情况均有不同,这种差别会直接影响转动分量的计算精度。美国西部地区随频率增加又减小的趋势,但其他两个地区随频率保持缓慢增加。更多还原

【Abstract】 The apparent wave velocity is an important parameter to calculate rotational components of an earthquake with its translation ones.Using 30 seismic wave acceleration records of 10 stations for Chi-chi earthquake,the group wave velocity and the visual wave velocity of the near zone of Chi-chi earthquake were calculated with the presented method here.The results were compared with the field wave velocities for Wenchuan earthquake and the earthquake of the western area of US.It was shown that the appearent wave velocity and its variation for Chi-chi earthquake are different from those for Wenchuan earthquake and the earthquake of the western area of US;the differences directly influence the calculating accurcy of rotational components;the apparent wave velocity for the earthquake of the western area of US decreases with increase in frequency;however,those for the other two earthquakes slowly increase with increase in frequency.更多还原