S-wave attenuation in the Sea of Marmara, Turkey

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• 作者：Horasan ; Gü ; ndü ; z ; Boztepe-Gü ; ney ; Aysun
• 关键词：Attenuation ; Coda wave ; Quality factor ; Lapse time ; Rheology ; The Sea of Marmara
• 刊名：Physics of the Earth and Planetary Interiors
• 出版年：2004
• 出版时间：May 28, 2004
• 年：2004
• 卷：142
• 期：3-4
• 页码：215-224
• 全文大小：441 K

文摘

This paper presents the estimates of frequency-dependent attenuation of S-waves for five different regions of the crust in the Sea of Marmara. The estimation method for the S-wave attenuation is based on the rate of decay of the S-wave to coda wave amplitude ratio with distance, Q_s⁻¹. The epicentral distances of the selected earthquakes are between 15 and 70km and the duration magnitudes are between 2.4 and 3.9. The quality factors, Q_s, are calculated at frequencies 1.5, 3, 6 and 12Hz and a lapse time 50s. The frequency dependency of average Q_s values calculated at these frequencies for five regions is 40±5f^1.03±0.06. The estimated Q_s values for five regions ranging from 13±1f^1.22±0.05 to 94±3f^0.83±0.04 indicate the regional differences in the rheology and tectonic activity of the crust.