地震波在介质中的衰减,是介质的重要特性之一,而Q值则是衡量衰减特性的主要物理参数,称之谓介质的品质因子。根据文献[1]提出的方法,用北京台网记到的近震直达P波资料,测定北京地区的大量Q值表明:Q值与P、S波到时差(t_s—t_p)有关;(t_s—t_P)大,测得的Q值也大;(t_s—t_P)小,测得的Q值也小。这种现象在朱传镇、李兴才 Seismic wave attenuation in the medium, is one of the important characteristics of the medium, and Q value is the main physical parameters to measure the attenuation characteristics, called the quality factor of the medium. According to the method proposed in [1], the large number of Q values ​​measured in Beijing using the near-Earth-s direct P-wave data recorded by Beijing Network show that the Q value is related to the time difference (t_s-t_p) of P and S waves; (t_s -t_P) is large, the measured Q value is also large; (t_s-t_P) is small, and the measured Q value is also small. This phenomenon in Zhu Chuanzhen, Li Xingcai