Inelastic attenuation of Body waves in southern syria

Abstract

In this study, inelastic attenuation has been explained methodological and practical both theoretically including traveling effect of seismic waves through the earth crust from source to receiver in heterogeneous and tectonically active medium, and its reflecting on the seismic waves (the attenuation), showing up like scattering attenuation and intrinsic attenuation, then explaining the mathematical equation of the attenuation and coda waves with a hint about the attenuation calculation methods as were used from authors in previous researches with detailed explaination about the coda decay method (CWD) that were applied in southern Syria using 31 earthquakes recorded in the (N.E.C) in Syria using 38 receiver to be (210) seismograms in total between (2009 -2024), with magnitude from (2-5) , for 7 central frequency (1-24)hz.

From attenuation calculation, resulting countour maps represent quality factor changes in the study zone for every central frequency, in addition to the basic attenuation parameters ( Q0، α )that form the attenuation general equation ، where it shows low Q0 values (130) reflecting high attenuation resulting from high tectonic deformations and faults , and the same for the constant(a) with high value(0,81) referring to high dependency for attenuation on frequency in the study zone.