TITLE:
Measuring Crustal Lg-Waves Attenuation in the Northern Part of Africa
AUTHORS:
Adoum Issak, Christian Camerlynck
KEYWORDS:
Lg-Wave Attenuation, Coda, Q Factor, North Africa
JOURNAL NAME:
Open Journal of Earthquake Research,
Vol.5 No.2,
May
24,
2016
ABSTRACT: Lg-waves propagate over long distances in the northern part of Africa and are recorded on the
seismic station located close to Abeche (Chad). We have applied the well-known coda analysis
method developed by Aki and Chouet [1] to study the Lg-wave anelastic attenuation in this area.
We found a frequency dependence: Q( f ) = (650±34) f (0.77±0.2). This result shows an average value
of Q0 (Q0 ≈ 650) for earthquakes occurred in tectonic areas as the East African Rift system, Turkey,
Greece and Red Sea. The higher value of Q0 (Q0 ≈ 800) is obtained for the event occurred in the
middle of the stable plate close to the Tamanrasset (TAM) station in Algeria.