Attenuation of coda waves and Q c value beneath the Chengdu telemetered seismic network

Zeng, Jian; Chen, Tian-Chang; Han, Wenzhong; Fan, Jun; Zheng, Sheng; Hasegawa, Akira; Horiuchij, Shigeki; Matsumoto, Satoshi

doi:10.1007/s11589-997-0069-0

Cited by 5 publications

(4 citation statements)

References 10 publications

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“…In this study, the single scattering model for coda waves is used. Seismic wave attenuation studies in the world by single scattering model show good correlation with the seismicity of the regions (ZENG et al, 1997;TITZSCHKAU et al, 2010;MOHANTY et al, 2009;PAUL et al, 2003;SHARMA et al, 2008). This is the first study of coda wave attenuation which uses a single back-scattering model along the EAFZ.…”

Section: Introductionmentioning

confidence: 88%

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: Introductionmentioning

confidence: 88%

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

Sertçelik

2011

Pure Appl. Geophys.

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“…The qualify factor in the anelastic attenuation function, Q(f)=Q 0 f n , is obtained from fitting based on S-or coda waves. Many studies concerning the qualify factor of Sichuan have been published [18][19][20][21][22], in which Hua et al particularly present two qualify factors, 206.7f 0.836 and 274.6f 0.423 , for the plain and mountain region of Sichuan province separately. Considering the working area of the study, the qualify factor, 274.6f 0.423 , was applied.…”

Section: Fig 2 Finite Fault Model Published On the Usgs Websitementioning

confidence: 99%

Stochastic Simulation of Ground Motions of the Wenchuan Earthquake Using Slip-Based Corner Frequency and Scaling Factor

Sun

Tao

Liu

2012

AMM

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Ground motions of the great Wenchuan earthquake were simulated using stochastic simulation technique with an improved source spectral model. In the model, the corner frequency for each subfault is determined based on a basic value calculated from the total seismic moment of the entire fault and an increment depending on the seismic moment assigned to the subfault. The model also includes a slip-based scaling factor accounts for the difference of the radiated energy from each subfault. The simulated ground motions were compared to those from using the source spectral model with dynamic corner frequency in terms of the mean spectral ratio over the 52 stations amd to the observation in terms of 5% damped response spectra. Based on the comparison, the effects of the slip-based corner frequency and the scaling factor on the simulation were discussed.

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“…where UGO and y are constants, then E, p1 and p2 can be regarded as constants, approximately. Under these approximations, the wave-packet theory can be applied (for details of the application of this theory in QG dynamics, one can refer to the work of Zeng (1983) and Tung (1983)). According to this theory, the dispersion relation of a wave packet with wave number peaking around k and n in the linearized SWSG model is are group velocities in the x and y directions respectively.…”

Section: Evolution Of Disturbancesmentioning

confidence: 99%

“…In this section, we first study the slowly (spatial) varying constant-shear basic-flow case by using the wave-packet method (e.g. Zeng 1983) and then the general case by the numerical method. The relative importance of regular normal-mode and continuous-spectrum disturbances in a (unstable) cosine-type basic flow are compared under some special initial conditions.…”

Section: Introductionmentioning

confidence: 99%

Evolution of disturbances and singular vectors in the shallow‐water semi‐geostrophic model

Ren¹

2000

Quart J Royal Meteoro Soc

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The first part of this work is devoted to exploring the instability mechanism of the shallow-water semigeostrophic model by investigating the evolution of disturbances under constant-shear and cosine-type basic flows. For the constant-shear basic-flow case, the wave-packet analysis method is applied to study the evolution of potential and total energy and the meridional structure of disturbances under the assumption of a spatially slowly varying basic state. The results are found to be in good agreement with numerical calculations even when the assumption is slightly relaxed. For the cosine-type basic-flow case, both unstable normal modes and continuous spectra exist if the stability criterion is violated. Numerical results show that the relative importance of regular normal-mode and continuous-spectrum disturbances in the evolution process depends on the configuration of initial disturbances and their projections onto the normal modes and continuous spectra.In the second part of this work, in order to search for initial disturbances based on which the growth of certain norms of disturbances can be optimized, singular vectors of different norms (metrics) are computed. It is found that of all the norms, the structures of singular vectors are mainly determined by the configuration of the zonal basic flow and less affected by model parameters such as the Rossby number, rotating Froude number, and amplitude of topography. However, when the shear of the basic flow is strong, the optimal singular value can be sensitive to the model parameters. When the stability criterion is violated, the optimal singular values of all the norms have clear wave-number preferences. The peaks of spectra of singular values of the energy-type norms, including potential, kinetic and total-energy norms, correspond to very weak normal-mode instability. However, the optimal singular value of the enstrophy norm has almost the same wave-number preference as unstable normal modes.

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Attenuation of coda waves and Q c value beneath the Chengdu telemetered seismic network

Cited by 5 publications

References 10 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

Stochastic Simulation of Ground Motions of the Wenchuan Earthquake Using Slip-Based Corner Frequency and Scaling Factor

Evolution of disturbances and singular vectors in the shallow‐water semi‐geostrophic model

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