Depth dependent seismic scattering attenuation in the Nuevo Cuyo region (southern central Andes)

Badi, Gabriela; Pezzo, Edoardo Del; Ibáñez, Jesús M.; Bianco, Francesca; Sabbione, Nora Cristina; Araújo, Maria Rizoneide Negreiros de

doi:10.1029/2009gl041081

Cited by 34 publications

(13 citation statements)

References 10 publications

(16 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Son focal depth, around 10 km, than those of the other studies. The same explanation is applicable to the observations at southern-central Andes (Badi et al, 2009), which showed higher Q −1 values at 3-6 Hz for shallow crustal events than those of deep upper-mantle events. This difference was more significant for Q −1 S values.…”

Section: Resultssupporting

confidence: 55%

“…In addition, different focal depth of each earthquake may cause significant scatter because large variations of Q −1 values of S waves are well known in the crust and upper mantle (Mitchell and Xie, 1994;Mitchell, 1995). In spite of the large difference in the Q values according to the depth, only a few of the previously reported MLTWA studies have considered between the shallow crust and the upper-mantle source (Badi et al, 2009). Recently, our review on MLTWA, where the focal depth range was narrowed around 10 km in South Korea (hereafter S. Korea), showed remarkably different attenuation values (Chung and Asep, 2013) compared to those of the other studies Chung, 2014) that used various focal depths.…”

Section: Introductionmentioning

confidence: 97%

See 1 more Smart Citation

Separation of Intrinsic and Scattering Attenuation Using Single Event Source in South Korea

Rachman¹,

Chung²,

Yoshimoto³

et al. 2015

Bulletin of the Seismological Society of America

View full text Add to dashboard Cite

Simultaneous use of numerous events in the multiple lapse time window analysis (MLTWA) method is the most effective way to obtain Q −1 i and Q −1 S values. Such simultaneous use of numerous events normally shows a large observational scatter, which may be caused by different radiation pattern and focal depth of each earthquake, and regional alteration of the local structure. To avoid these scattering factors, the current study attempted to use single event source as the input data in MLTWA for South Korea. The direct simulation Monte Carlo (DSMC) method was used to simulate the observations, which showed realistic results when the number of recorded stations was eight or more. The obtained values of seismic albedo (B 0 ) were less than 0.5, which were in accordance with the same in the previous results. Three envelopes constructed by combination of three regional values of Q −1 Lg at 1 Hz produced regional variations, of which the ones at high frequencies of Q −1 i and at low frequencies of Q −1 S were remarkable. This result, showing the local variation indicated an advantage of the study using single source event over the previous studies in South Korea that involved extensively distributed data. Because DSMC was known to be applicable to 3D structure due to its simple algorithm, the current study also tried to correct radiation pattern of the observations by inserting focal mechanism algorithm to the code of the DSMC method. Such insertion, however, generated extremely low values of Q −1 S because the geometrically shrunk receiver could not capture most of the scattered particles. This receiver problem is most likely to be a major obstacle of the 3D study of DSMC. In addition, the significant depth effect of Q −1 was identified for the prior MLTWA studies resulting from different measurement range and focal depth.

show abstract

Section: Resultssupporting

confidence: 55%

Section: Introductionmentioning

confidence: 97%

Separation of Intrinsic and Scattering Attenuation Using Single Event Source in South Korea

Rachman¹,

Chung²,

Yoshimoto³

et al. 2015

Bulletin of the Seismological Society of America

View full text Add to dashboard Cite

show abstract

“…For shallow events, they found approximately Q 0 100 and Q 10 1300 while we found values of 149 and 772, respectively. Few parameters were given by Badi et al (2009); however, the lapse time was 90 s, substantially longer than the 30 s we use, and one could therefore expect a higher Q as also observed for Q 10 . There was no obvious division to make in the Shanxi rift system and due to the relatively large distance between stations in the network, only a few results were obtained when using a lapse time of 30 s and all data were grouped together.…”

Section: Northwestern and Central Argentinamentioning

confidence: 85%

“…Because the difference was small, the two groups were merged. Badi et al (2009) studied Q from both shallow and deep events in the southern part of our study area using different methods, among these CWD. For shallow events, they found approximately Q 0 100 and Q 10 1300 while we found values of 149 and 772, respectively.…”

Section: Northwestern and Central Argentinamentioning

confidence: 99%

CodaQin Different Tectonic Areas, Influence of Processing Parameters

Havskov¹,

Sørensen²,

Vales³

et al. 2016

Bulletin of the Seismological Society of America

View full text Add to dashboard Cite

Published results of coda Q show a large variation in values. These variations are often claimed to be related to different tectonics, whereas they might just be related to using different assumptions in the processing, leading to different input parameters for the analysis. In this study, the effect of using different processing parameters is investigated and significant differences, particularly at low frequencies, are observed. We find a new set of optimal parameters, which we recommend using in future studies. Using a short lapse time of 30 s and optimal parameters, data from both similar and very different tectonic regions are used to calculate coda Q using the same program and the same parameters.

show abstract

“…In the 2 4 Hz band, scattering is strong in Hokkaido and northern Honshu, but it is weak in western Japan, and especially weak in Shikoku. 1 Kanto-Tokai, Japan (Fehler et al 1992), 2 Long Valley, California (Mayeda et al 1992), 3 Central California (Mayeda et al 1992), 4 Hawaii (Mayeda et al 1992), 5 Japan (Hoshiba 1993), 6 Southern California (Jin et al 1994), 7 Northern Greece (Hatzidimitriou 1994), 8 Southern Spain, < 170 km (Akinci et al 1995), 9 Southern California (Adams and Abercrombie 1998), 10 Northeastern Venezuela (Ugalde et al 1998), 11 Eastern Turkey (Akinci andEyidogan 2000), 12 Southern Apennines Bianco et al (2002), 13 South Central Alaska (Dutta et al 2004), 14 Southern Netherlands (Goutbeek et al 2004), 15 Northeastern Colombia (Vargas et al 2004), 16 Northeastern Italy (Bianco et al 2005), 17 Southern Sicily (Giampiccolo et al 2006), 18 Southern Anatolia (Sahin et al 2007), 19 Japan (average) (Carcolé and Sato 2010), 20 Southern central Andes (D <40 km) (Badi et al 2009), 21 Southern central Andes (40 km < D < 210 km) (Badi et al 2009), 22 Southeastern South Korea (Lee et al 2010) In the 8 16 Hz band, scattering is strong in Honshu; however, it is weak in Shikoku.…”

Section: Mltwa In Japanmentioning

confidence: 99%

Seismic Wave Propagation and Scattering in the Heterogeneous Earth : Second Edition

Sato¹,

Fehler²,

Maeda³

2012

471

385

View full text Add to dashboard Cite

Scattering due to randomly distributed small-scale heterogeneities in the earth significantly changes seismic waveforms of local earthquakes especially for short periods. Scattering excites long lasting coda waves after the direct arrival and broadens the apparent duration of oscillation with increasing travel distance much longer than the source duration time. Models of propagation through deterministic structures such as those with horizontally uniform velocity layers cannot explain those observed phenomena. Our goal in writing this book is to put a focus on the phenomena of seismic wave scattering by distributed heterogeneities in the earth, especially in the lithosphere, where stochastic treatment is essential to describe both heterogeneous media and wave propagation through them. Stochastic approaches and deterministic approaches are complementary for the construction of a unified image of the earth's structure.Keiiti Aki was a distinguished pioneer who extensively developed various stochastic methods for short-period seismology. His strong encouragement and continuous support for us were essential in motivating us to write the first edition of this book. Before Kei passed away in 2005, he kindly cited our book when he argued for the importance of the study on seismic wave scattering caused by small-scale heterogeneity in his letter to V. I. Keilis-Borok, ". . . To a geodynamicist, the earth's property is smoothly varying within bodies bounded by large-scale interfaces. Most seismologists also belong to this "smooth earth club," because once you start with an initial model of smooth earth your data usually do not require the addition of smallscale heterogeneity to your initial model. As summarized well in a recent book by Sato and Fehler (1998), the acceptance of coda waves in the data set is needed for the acceptance of small-scale seismic heterogeneity of the lithosphere. There are an increasing number of seismologists who accept it, forming the "rough earth club." I believe that you are also a member of the rough earth club, judging from the emphasis on the hierarchical heterogeneity of the lithosphere. . . . "(Aki 2009).The first edition of this book was fortunately accepted in the geophysical community as a textbook, especially for graduate students. Furthermore it has been often cited in the physics community since this book introduced various aspects of wave scattering in real heterogeneous media. During the decade following the vii viii Preface to the Second Edition publication of the first edition, there were developments in stochastic methods and analyses focusing on seismogram envelopes. Radiative transfer theory has been used not only for the study of coda envelopes but also for the analysis of whole seismogram envelopes. These studies made it possible to resolve the spatial variation of scattering strength. There have been developments in the statistical description of wave propagation in random media that reliably predict the delay of peak amplitude from the onset and the broadening of seismogr...

show abstract

Depth dependent seismic scattering attenuation in the Nuevo Cuyo region (southern central Andes)

Cited by 34 publications

References 10 publications

Separation of Intrinsic and Scattering Attenuation Using Single Event Source in South Korea

Separation of Intrinsic and Scattering Attenuation Using Single Event Source in South Korea

CodaQin Different Tectonic Areas, Influence of Processing Parameters

Seismic Wave Propagation and Scattering in the Heterogeneous Earth : Second Edition

Contact Info

Product

Resources

About