Lapse time and frequency-dependent attenuation of coda waves in the Zagros continental collision zone in Southwestern Iran

Rahimi, Habib; Hamzehloo, H.

doi:10.1088/1742-2132/5/2/004

Cited by 48 publications

(29 citation statements)

References 29 publications

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“…High increase in Q c is observed with increasing lapse time, and it is calculated as Q c = 85.8f 0.75 in the study area. The same trend of Q c with 40 s lapse time has been observed in NW Himalaya (KUMAR et al, 2005), southwestern Iran (RAHIMI and HAMZEHLOO, 2008), southeastern Sicily (GIAMPICCOLA et al, 2004), Abu Dabbad-Egypt (ABDEL-FATTAH et al, 2008), Delhi (MOHANTY et al, 2009), Koyna region (GUPTA et al, 1998 (Fig. 8).…”

Section: Comparison Of Q C and Lapse Time In Active Regionssupporting

confidence: 67%

Estimation of Coda Wave Attenuation in the East Anatolia Fault Zone, Turkey

Sertçelik

2011

Pure Appl. Geophys.

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In this study, the attenuation of coda waves Q c (f) has been estimated for different lapse times and frequencies in the East Anatolia Fault Zone (EAFZ) in Turkey using a single back-scattering model of S-coda envelopes. The data include 255 earthquakes recorded by ten stations. The frequency-dependent Q c values are estimated at central frequencies of 1.5, 3, 6, 8, 12, and 18 Hz using 20-30-40 s lapse time windows. Along this fault zone, the frequency-dependent Q c obtained for all data and lapse time is Q c = 57.5f 0.82 . The entire study area is divided into six subregions according to the magnitude of the earthquakes and the location of the fault segments. The estimated average frequency-dependent relation for all lapse times are; Q c I ð Þ ¼ 34:3f 0:93 for Bingöl-KarliovaErzincan triple junction; Q c II ð Þ ¼ 56:3f 0:71 for Bingol-Lake Hazar segment; Q c III ð Þ ¼ 68:5f 0:75 for Lake Hazar-Sincik segment; Q c IV ð Þ ¼ 72:5f 0:78 Hazar-Sincik and Ç elikhan-Gölbaşı faults; Q c V ð Þ ¼ 59:7f 0:87 for Kahramanmaras triple junction and Q c VI ð Þ ¼ 67:4f 0:94 for Amanos Range and Karasu Basin. The lowest Q c is determined between Bingol and Malatya. The highest Q c value is along Amanos Range. In addition, Q c values are calculated for each regions at different lapse times. The average Q c value of the study region varies from 53 ± 11 at 1.5 Hz to 498 ± 41 at 18 Hz for 20 s lapse time window, as its variation is from 116 ± 11 at 1.5 Hz to 749 ± 75 at 18 Hz of central frequency for 40 s lapse time window. The increase of Q c with lapse times changes from one subregion to another along the fault zone. The rate of increment is significantly higher in Bingöl-Karliova-Erzincan triple junction than in the other subregions. This rapid increase of low Q c values in the junction reaches the general attenuation characteristics of the fault at 40 s lapse time. Finally, the low Q 0 and high n values can be attributed to the energy loss as a result of the heterogeneity and activity along the fault zone. The increase of Q c with frequency, lapse time may be related to heterogeneity decreases with depth. The rapid increase of Q c with depth in Bingöl-Karliova-Erzincan triple junction may be interpreted that the effect of the Northern Anatolian Fault Zone is effective in the upper crust is not so deep compared to EAFZ.

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Section: Comparison Of Q C and Lapse Time In Active Regionssupporting

confidence: 67%

Estimation of Coda Wave Attenuation in the East Anatolia Fault Zone, Turkey

Sertçelik

2011

Pure Appl. Geophys.

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“…Low Q 0 values (Q 0 < 200) and high frequency dependent power (n) have been reported by different investigators for tectonically active regions (Roecker et al, 1982;Hatzidimitriou, 1993;Akinci et al, 1994;Baskoutas et al, 1998;Giampiccolo et al, 2002;Rahimi and Hamzehloo, 2008;Ma'hood and Hamzehloo, 2009;de Lorenzo et al, 2013) and high Q 0 values (Q 0 > 600) with low frequency dependence (n) for tectonically stable regions (Singh and Herrmann, 1983;Pulli, 1984;Pujades et al, 1991;Ramakrishna et al, 2007). As shown in Figure 11, some studies reported moderate Q 0 values (between tectonically active and stable regions) with high frequency dependence (Scherbaum and Kisslinger, 1985;Kvamme and Havskov, 1989;Kumar et al, 2005).…”

Section: Comparison Of Results With Other Regionsmentioning

confidence: 78%

Estimation of Coda‐Wave Attenuation in the Central and Eastern Alborz, Iran

Farrokhi¹,

Hamzehloo²,

Rahimi³

et al. 2015

Bulletin of the Seismological Society of America

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The quality factor of coda (Q c ) waves has been estimated by using single backscattering and single isotropic scattering models. The earthquakes used were recorded by three permanent and one temporary network located in the central and eastern Alborz, Iran. The database was composed of 746 local earthquakes with local magnitude from 1.1 to 5.7. The estimated Q c has been found to be similar for lapse times greater than twice the S-wave travel time (2t S ) for both methods.The estimated Q c for central frequencies < 1:0 Hz shows less frequency dependency compared with the higher frequencies. By using a Q 0 f n relation, the average frequency dependence of Q c for the whole area has been estimated as 59f 1:03 , 69f 0:97 , 78f 0:97 , 105f 0:93 , 123f 0:89 , 159f 0:79 , and 203f 0:68 for central lapse times 30, 40, 50, 65, 85, 110, and 155 s, respectively. We found the value of Q 0 decreases at an average depth of 78 km, which may be the result of high dissipating media at this depth. The average Q c values, estimated for central and eastern Alborz and their frequencydependent relationships are similar to those of tectonically active regions.

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“…To invert phase and group velocity dispersions, we used the average Q S structural models to avoid anelastic dispersion effect. The average values of Q S are taken from the literature as ∼25 and ∼55 for crust and upper mantle (Cong and Mitchell, 1998;Motazedian, 2006;Rahimi and Hamzehloo, 2008;Ma'hood et al, 2009;Rahimi et al, 2009Rahimi et al, , 2010.…”

Section: Constructing the Starting Modelmentioning

confidence: 99%

Shear-Wave Velocity Tomography of the Lithosphere-Asthenosphere System beneath the Iranian Plateau

Rahimi¹,

Hamzehloo²,

Vaccari³

et al. 2014

Bulletin of the Seismological Society of America

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We conducted a tomographic inversion of Rayleigh-wave dispersion to obtain 2D phase and group velocity tomographic images in the 10-100 s period range and shear-wave velocity structures for the Iranian plateau. For this purpose, the fundamental mode of Rayleigh waves, recorded along 1586 paths by 29 broadband stations, was identified by applying the frequency time analysis (FTAN) to each epicenter-station path which simultaneously satisfies the two-station method conditions. The fundamental modes identified by FTAN have been used to determine the path-average interstation phase and group velocities at selected periods. With this procedure, 243 group and phase velocity dispersion curves were processed to obtain tomographic maps by applying the Yanovskaya-Ditmar formulation for periods in the 10-100 s range. Averaged dispersion curves of phase and group velocities, which represent six rather homogeneous regions, are computed. Finally, we used a fully nonlinear inversion procedure to derive tomographic images of the elastic structure of the lithosphere and asthenosphere of the six main structural and seismotectonic features of the Iranian plateau. The dense path coverage in the Iranian plateau permits us to produce images that have substantially higher lateral resolution compared to images currently available from global and regional group velocity studies. Tomographic maps at high frequencies are well correlated with the upper crust structure, especially with sediment layers thickness. Estimated shear-wave velocity structures are well correlated with the shield-like lithosphere structure in Zagros. A low-velocity zone (LVZ) is not detected in Alborz or the south Caspian basin, which can imply thrusting of the oceanic crust of the southern Caspian Sea under the Alborz to the south. LVZs are derived for the region east of Iran, central Iran, and Kopeh Dagh.

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Lapse time and frequency-dependent attenuation of coda waves in the Zagros continental collision zone in Southwestern Iran

Cited by 48 publications

References 29 publications

Estimation of Coda Wave Attenuation in the East Anatolia Fault Zone, Turkey

Estimation of Coda Wave Attenuation in the East Anatolia Fault Zone, Turkey

Estimation of Coda‐Wave Attenuation in the Central and Eastern Alborz, Iran

Shear-Wave Velocity Tomography of the Lithosphere-Asthenosphere System beneath the Iranian Plateau

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