Journal of Seismology

, Volume 12, Issue 3, pp 367–376 | Cite as

Lateral variations of coda Q and attenuation of seismic waves in Southwest Anatolia

Original article

Abstract

The seismic quality factor (Qc) and the attenuation coefficient (δ) in the earth’s crust in southwest (SW) Anatolia are estimated by using the coda wave method based on the decrease of coda wave amplitude by time on the seismogram. The quality factor Qo, the value of Qc at 1 Hz, and its frequency dependency η are determined from this method depending on the attenuation properties of scattered coda waves. δ is determined from the observations of amplitude variations of seismic waves. In applying the coda wave method, firstly, a type curve representing the average pattern of the individual coda decay curves for 0.75, 1.5, 3.0, 6.0, 12.0, and 24.0 Hz values was estimated. Secondly, lateral variation of coda Q and the attenuation coefficients for three main tectonic patterns are estimated. The shape of the type curve is controlled by the scattering and attenuation in the crustal volume sampled by the coda waves. The Qo and η values vary from 30 to 180 and from 0.55 to 1.25, respectively for SW Anatolia. In SW Anatolia, coda Qf relation is described by \(Q = (102 \pm 8)^{*\;f0.82 \pm 0.07} \) and δ = 0.008 km−1. These results are expected to help in understanding the degree of tectonic complexity of the crust in SW Anatolia.

Keywords

Anatolia Attenuation coefficient Coda wave Energy Heterogeneity 

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Copyright information

© Springer Science+Business Media B.V. 2007

Authors and Affiliations

  1. 1.Geophysical Engineering DepartmentSDU, Engineering and Architecture FacultyIspartaTurkey

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