抄録
In a previous paper (1963), Q of short period P waves was determined by a method based on two assumptions: 1) The value of Q is constant, at least, in the frequency range from 1 to 7 cps; 2) The type of spectrum near the focus is such that the amplitude of each component is inversely proportional to the frequency. It was shown that Q of short period P waves had large values of order of few thousands.
In the present paper, Q of short period S waves is determined from the records of distant earthquakes by the same method as that used for short period P waves. Its value is ranged from 400 to 2400. In each earthquake, it is smaller than Q of short period P waves for frequency range from 0.2 to 7 cps. For this frequency range, Q seems to be nearly constant for short period S waves.
It is pointed out that short period S waves are even more predominant in some cases than short period P waves obtained from earthquakes whose epicentral distances are shorter than 30 degrees.
