By analyzing the decay of coda wave amplitude, we have determined coda
Q,Q(c), in Western Anatolia (Turkey). Using the single isotropic scat
tering model, we analyzed 116 earthquakes which registered at the Gebz
e station by using five narrow frequency bands centered at 1.5, 3, 6,
8 and 10 Hz. Coda Q values were obtained using different lapse times,
between 30 and 190 s, in steps of 10 s. Coda Q(c) for Western Anatolia
depends on frequency and lapse time. For a lapse time of 30 s, the fr
equency dependence of Q(c) is Q(c)(f) = 50.7f1.01 and for a lapse time
of 190 s it is Q(c)(f) = 183.2f0.76. In this region, the exponential
value of the Q(c) frequency dependence is practically constant, betwee
n 0.7 and 1.0. The obtained coda Q(c) values were compared with those
estimated in other regions. The coda Q(c) values for lapse times betwe
en 60 and 100 s for Western Anatolia and Southern Spain are practicall
y the same, indicating similar coda wave attenuation patterns in both
regions of the Mediterranean Basin.