Bulletin of the Seismological Society of America; February 2006; v. 96; no. 1;
p. 200-214; DOI: 10.1785/0120050038
© Seismological Society of America
Click on image to view larger version.

Figure 8. QS/QP ratio versus frequency for
different selected distances. The thick lines indicate the ratio obtained when
considering the average quality factor for each distance range, as shown in
Figure 7. The horizontal dotted
lines indicate the reference values (see text).
Copyright © 2009 by Seismological Society of America