Attenuation study in the Straits of Messina area (southern Italy)

Tuvè, Tiziana; Bianco, Francesca; Ibáñez, Jesús M.; Patané, Domenico; Pezzo, E. Del; Bottari, Antonio

doi:10.1016/j.tecto.2006.04.005

Cited by 48 publications

(23 citation statements)

References 34 publications

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“…Eastern Indian Shield 313.2f 0.73 Present study Adirondack Mountains (Shi et al 1996), and New England (Pulli 1984) is noted at lower frequencies and increases further gradually. The attenuation values though are found to be higher than Southern Italy (Tuve et al 2006), Central Iran (Ma'hood et al 2009), Guerrero, Mexico (Rodriguez et al 1983), Dead Sea (Van Eck 1988, Parkfield (Hellweg et al 1995), Friuly, Italy (Rovelli 1982), and South Spain (Ibáñez et al 1990) for all the frequencies, becomes lesser than Baltic Shield (Kvamme and Havskov 1989), Norway (Kvamme and Havskov 1989) at higher frequency. This worldwide comparison also advocates similar view of moderate to higher attenuation of seismic shear wave for the Eastern Indian Shield region.…”

Section: Resultsmentioning

confidence: 69%

Coda Q in Eastern Indian shield

2015

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. Thus, the attenuation follows the power law relationships (e.g., Q c = Q 0 f n ), and the moderate to higher values of frequency parameters (n) obviously show that the Q c value is a strong function of frequency. The increasing values of Q 0 with increasing lapse time indicating the depth dependency of attenuation, and accounts for decreasing heterogeneity towards deeper level beneath the study area.

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Section: Resultsmentioning

confidence: 69%

Coda Q in Eastern Indian shield

2015

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“…This method explains the coda-wave envelope in the time domain, which exhibits an exponential decay when especially band pass-filtered at a given center frequency. Since numerous other studies (e.g., see UGALDE et al, 1998;TUVE et al, 2006) described how the coda-Q method works, herein we neglect the algebraic details and continue with the application. The observed envelopes of the filtered traces are fitted to those obtained from the theoretical expression, which yields the desired value for the coda-wave attenuation (Q c -1 ).…”

Section: Methods and Data Analysismentioning

confidence: 99%

Intrinsic and Scattering Seismic Attenuation in Southwestern Anatolia

Şahin

Erduran

Alptekin

et al. 2007

Pure appl. geophys.

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The intrinsic dissipation and scattering attenuation in southwestern (SW) Anatolia, which is a tectonically active region, is studied using the coda waves. First the coda quality factor (Q c ) assuming single scattering is estimated from the slope of the coda-wave amplitude decay. Then the Multiple Lapse Time Window (MLTW) analysis is performed with a uniform earth model. Three non-overlapping temporal data windows are used to calculate the scattered seismic energy densities against the source-receiver distances, which, in turn, are used to calculate separate estimates of the intrinsic and scattering factors. In order to explore the frequency dependency, the observed seismograms are band pass-filtered at the center frequencies of 0.75, 1.5, 3.0, 6.0 and 12.0. The scattering attenuation (Q s -1 ) is found lower than the intrinsic attenuation (Q i -1 ) at all frequencies except at 0.75 Hz where the opposite is observed. Overall the intrinsic attenuation dominates over the scattering attenuation in the SW Anatolia region. The integrated energy curves obtained for the first energy window (i.e., 0-15 s) are somewhat irregular with distance while the second (i.e., 15-30 s) and third (i.e., 30-45 s) data windows exhibit more regular change with distance at most frequencies. The seismic albedo B 0 is determined as 0.61 at 0.75 Hz and 0.34 at 12.0 Hz while the total attenuation factor denoted by L e -1 changes in the range 0.034-0.017. For the source-station range 20-180 km considered the scattering attenuation is found strongly frequency dependent given by the power law Q s -1 = 0.010*f -1.508 . The same relations for Q i -1 , Q t -1(total), Q c -1 andQ À1 c (expected) hold as Q i -1 = 0.0090*f -1.17 , Q t -1 = 0.019*f -1.31 , Q c -1 = 0.008*f -0.84 and Q À1 c ¼ 0:014 Ã f À0:87 ; respectively. Compared to the other attenuation factors Q c -1 andQ À1 c are less dependent on the frequency.

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“…In general, Q c values in the range 50-100 at 1.5 Hz, and 150-200 at 3 Hz have been reported (e.g. Mayeda et al 1992;Akinci & Eyidogan 2000;Tuvé et al 2006, among the others). The origin of this discrepancy is threefold: coda attenuation is known to present a time-lapse dependency, probably related to inhomogeneous distribution of scatterers and depth-dependent intrinsic attenuation in the crust (e.g.…”

Section: Coda Analysismentioning

confidence: 97%

“…Mayeda et al 1992;Tuvé et al 2006). Moreover, the vertical component is not affected by the large amplitude SH wave dominating the transversal component as a consequence of the chosen strike-slip mechanism.…”

Section: Coda Analysismentioning

confidence: 98%

“…Hoshiba 1994). In this study, we are obliged to evaluate Q c at a time lapse smaller than in many attenuation studies and, as shown in Tuvé et al (2006), this could lead to lower values. On the other hand, the shallow depth at which we deployed the point-source forces the seismic waves to propagate prevalently in the shallow low-velocity layer characterized by very high attenuation values, while databases used in attenuation studies usually comprise deeper events able to sample regions of the crust where attenuation is weaker (Bethmann et al 2012).…”

Section: Coda Analysismentioning

confidence: 99%

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