Body-wave Attenuation in the Region of Garda, Italy

Castro, Raúl R.; Massa, Marco; Augliera, P.; Pacor, Francesca

doi:10.1007/s00024-008-0365-1

Cited by 24 publications

(18 citation statements)

References 20 publications

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“…There are several studies for various regions of the world that have considered Q S /Q P , and most of them report the ratio Q S /Q P >1 for all frequencies. Castro et al (2008) found Q S /Q P to be between 0.7 and 2.8 for the region of Garda, the Central Alps, which is in an excellent agreement with results presented here. Yoshimoto et al (1993) estimated Q S /Q P >1 for Kanto region, Japan, whereas Mahood et al (2009) obtained ratios between 1.3 and 2.0 in East Central Iran.…”

Section: Resultssupporting

confidence: 93%

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Attenuation of high-frequency body waves in the crust of the Central External Dinarides

Dasović

Herak

2015

J Seismol

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The Central External Dinarides are known as a tectonically complex region of moderate seismicity where several strong earthquakes occurred in the last century. In order to gain insight into the attenuation of seismic waves in the area, the extended coda normalization method was applied to band-pass-filtered seismograms of local earthquakes recorded at seven seismological broadband stations. Obtained results indicate strong attenuation of direct body waves: Q 0,P =Q P (1 Hz) is found between 21 and 120 and Q 0,S =Q S (1 Hz) is between 46 and 113, whereas the exponent n in the power law of frequency dependence of the quality factor is found in the range of 0.63-1.52 and 0.65-0.97 for n P and n S , respectively. P-waves are, on the average, attenuated more than S-waves. The three island stations (Dugi Otok (DUGI), Žirje (ZIRJ), Hvar (HVAR)) are distinguished by the strong low-frequency P-wave attenuation and more pronounced frequency dependence of the Q P factor (Q 0,S /Q 0,P >1.7, Q 0,P <60, n P >n S ). The remaining four inland stations (Udbina (UDBI), Morići (MORI), Kijevo (KIJV), Čačvina (CACV)) all exhibit similar qualitative attenuation properties for P-and S-waves (n P ≈n S ≈1 and Q 0,S ≈Q 0,P ), although individual values of the Q-factors vary notably within this group. Low-frequency attenuation of direct S-waves in the crust is stronger than mean attenuation of scattered coda waves in the lithosphere, especially for long coda lapse times. The results are also qualitatively in agreement with the thermal regime in the area.

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Section: Resultssupporting

confidence: 93%

“…1)et al (1996) estimated Q S =16f 0.92 from accelerograms for the Friuli region in NE Italy. For the region of Garda,Castro et al (2008) reported Q P =65f 0.9 and Q S =160f 0.6…”

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confidence: 96%

Attenuation of high-frequency body waves in the crust of the Central External Dinarides

Dasović

Herak

2015

J Seismol

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“…The considered source-to-station distances (mostly within 35 km) are on average shorter than the usual range of GIT applications (e.g., Castro et al, 2008;Bindi et al, 2009), and the inter-station distance is, in some cases, smaller than 1 km. Under such condition of short and similar ray paths, the method could fail in separating simultaneously the effect of site, source, and attenuation.…”

Section: Introductionmentioning

confidence: 99%

Separation of source and site effects by generalized inversion technique using the aftershock recordings of the 2009 L’Aquila earthquake

Ameri

Oth

Pilz

et al. 2011

Bull Earthquake Eng

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“…We work on almost 16000 waveforms from 770 earthquakes recorded by 54 stations. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 23 Figure 5 -Comparison of our <Q> for coda and direct waves obtained for the whole Northern Italy with some regional relationships for the Western Alps (Morasca et al 2006, Walter et al 2007 for station BNI), Eastern Alps (Castro et al 1996;Console and Rovelli, 1981;Malagnini et al 2002;Walter et al 2007 for station TRI) Central Alps , Castro et al 2008) and Apennines (Malagnini et al 2000).…”

Section: Discussionmentioning

confidence: 91%

“…Within Northern Italy, the Q parameter has been defined using one-dimensional models for different sub-regions (e.g., Morasca et al 2006 and, for the Western Alps; Thouvenot, 1983, Castro et al 2008 for the Central Alps; Malagnini et al 2002, Castro et al 1996and Console and Rovelli, 1981 for the Eastern Alps). The motivation for improving upon the 2-D attenuation model for Northern Italy is several fold.…”

Section: Introductionmentioning

confidence: 99%

Improved 2-D attenuation analysis for Northern Italy using a merged dataset from selected regional seismic networks

Morasca

Massa²,

Laprocina³

et al. 2010

J Seismol

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A merged, high-quality waveform data set from different seismic networks has been used to improve our understanding of lateral seismic attenuation for Northern Italy. In a previous study on the same region, Morasca et al. (2008) were able to resolve only a small area due to limited data coverage. For this reason the interpretation of the attenuation anomalies was difficult given the complexity of the region and the poor resolution of the available data. In order to better understand the lateral changes in the crustal structure and thickness of this region, we selected 770 earthquakes recorded by 54 stations for a total of almost 16000 waveforms derived from seismic networks operating totally or partially in Northern Italy. Direct S-wave and coda attenuation images were obtained using an amplitude ratio technique that eliminates source terms from the formulation. Both direct and early-coda amplitudes are used as input for the inversions and the results are compared.Results were obtained for various frequency bands ranging between 0.3-25.0 Hz, and in all cases show significant improvement with respect to the previous study since the resolved area has been extended and more crossing paths have been used to image smaller scale anomalies. Quality-factor estimates are consistent with the regional tectonic structure exhibiting a general trend of low attenuation under the Po Plain basin and higher values for the western Alps and northern Apennines. The interpretation of the results for the Eastern Alps is not simple, possibly because our resolution for this area is still not adequate to resolve small scale structures.Response to Reviewers: Dear Dr. ZahradnikBelow is our response to the two reviewers' comments and we have uploaded both the revision and another copy with highlighted changes. Both reviewers had very good suggestions and we tried to address each item. We feel fortunate to have received such thorough reviews, particularly reviewer #2 who had numerous comments that ultimately made the paper more clear. We emphasize that this current study is an extension of the 2008 Western Alps study by Morasca et al. (BSSA) but incorporating a much larger data set. The inversion methodology and assumptions on using the early coda is described in detail in the previous work. In addition, we cite in the current study other supporting papers that describe in great detail more of the method. Including this once again in this paper would seem redundant. In addition, we have highlighted changes in the revision as well. COMMENTS FOR THE AUTHOR:Reviewer #1: This paper presents a 2-D Attenuation study for Northern Italy. The authors use earthquakes recorded by several stations deployed in the region. This study extends geographically the knowledge of Q distribution especially north eastern of the studied zone. The presented results agree with previously reported. I found this manuscript to be well written and presenting a very complete study. I support its publication in JOSE. I have some minor comments:1.-Abstract shows ...

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Body-wave Attenuation in the Region of Garda, Italy

Cited by 24 publications

References 20 publications

Attenuation of high-frequency body waves in the crust of the Central External Dinarides

Attenuation of high-frequency body waves in the crust of the Central External Dinarides

Separation of source and site effects by generalized inversion technique using the aftershock recordings of the 2009 L’Aquila earthquake

Improved 2-D attenuation analysis for Northern Italy using a merged dataset from selected regional seismic networks

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