Spatial distribution of lateral heterogeneity in the upper mantle around the western Pacific region as inferred from analysis of transverse components of teleseismic P‐coda

Nishimura, Takeshi; Yoshimoto, Keitaro; Ohtaki, Toshiki; Kanjo, Kenji; Purwana, Ibnu

doi:10.1029/2002gl015606

Cited by 21 publications

(14 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Nishimura et al (2002) analyzed the energy partition of teleseismic P-wave and P-coda into the transverse-component to evaluate the lithospheric heterogeneity in the western Pacific region. Nishimura et al (2002) analyzed the energy partition of teleseismic P-wave and P-coda into the transverse-component to evaluate the lithospheric heterogeneity in the western Pacific region.…”

Section: Fig 233mentioning

confidence: 99%

“…Applying the moving window cross-correlation analysis to seismic records from the artificial explosions recorded at eight stations around the focal area, Nishimura et al (2002; found that the average seismic velocity of the crust surrounding the focal region decreased about 1% in the frequency range 3 6 Hz during the three months including the earthquake occurrence. An M 6:1 earthquake took place on the southwestern flank of this volcano on September 3, 1998.…”

Section: Temporal Change In Velocitymentioning

confidence: 99%

“…Nishimura et al (2002) analyzed the transverse amplitude of teleseismic P-wave to evaluate the heterogeneity in the lithosphere in the western Pacific region and showed the presence of strong inhomogeneity in and around the tectonically active regions. Nishimura et al (2002) analyzed the transverse amplitude of teleseismic P-wave to evaluate the heterogeneity in the lithosphere in the western Pacific region and showed the presence of strong inhomogeneity in and around the tectonically active regions.…”

Section: Observation Of Vector-wave Envelopesmentioning

confidence: 99%

See 2 more Smart Citations

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

Sato¹,

Fehler²,

Maeda³

2012

450

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

Section: Fig 233mentioning

confidence: 99%

Section: Temporal Change In Velocitymentioning

confidence: 99%

Section: Observation Of Vector-wave Envelopesmentioning

confidence: 99%

See 1 more Smart Citation

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

Sato¹,

Fehler²,

Maeda³

2012

450

385

View full text Add to dashboard Cite

show abstract

“…Korn (1993) further applied this approach to teleseismic P coda observations from nine stations around the Pacific. Nishimura et al (2002) analyzed transverse components in teleseismic P coda for stations in the western Pacific and noted stronger scattering for stations close to plate boundaries compared to those on stable continents. The observed frequency dependence of Q Sc is in approximate agreement with single-scattering theory for random heterogeneities and favors von Karman type ACFs over Gaussian or self-similar models.…”

Section: P Codamentioning

confidence: 99%

Deep Earth Structure: Seismic Scattering in the Deep Earth

Shearer

2015

Treatise on Geophysics

View full text Add to dashboard Cite

“…This method has the merit in that we can evaluate the heterogeneity even at regions where local earthquakes are not observed. Large amplitudes are observed in the transverse component at stations located on active tectonic regions, while small amplitudes are observed on stable continents (Nishimura, 1996;Nishimura et al, 2002;Kubanza et al, 2006Kubanza et al, , 2007. Sato (2006) has formulated the vector waves of P-waves incident to the heteroCopy right c The Society of Geomagnetism and Earth, Planetary and Space Sciences (SGEPSS); The Seismological Society of Japan; The Volcanological Society of Japan; The Geodetic Society of Japan; The Japanese Society for Planetary Sciences; TERRAPUB.…”

Section: Introductionmentioning

confidence: 99%

Heterogeneity of the Japanese islands as inferred from transverse component analyses of teleseismic P-waves observed at a seismic station network, Hi-net

Nishimura

2012

Earth Planet Sp

Self Cite

View full text Add to dashboard Cite

Teleseismic P-waves are observed even in a transverse component, and the ratio of the peak energy of the transverse component to that of the sum of the three components (peak energy ratio) is a good indicator to represent the strength of the heterogeneity in the structure. We analyze the short-period teleseismic P-waves recorded at a dense seismic network in Japan (Hi-Net) and determine the spatial changes of the heterogeneity in the Japanese islands. The results show that east Japan is characterized mainly by large peak energy ratios that represent strong heterogeneity. On the other hand, west Japan shows small peak energy ratios. Comparison of the results with detailed geological maps further shows that large peak energy ratios are observed at regions located close to both quaternary volcanoes and active faults, and the active fault region is characterized by slightly smaller peak energy ratios. Non-active regions, located far from volcanoes or faults, indicate the smallest ratios, although the ratios are larger than those estimated on stable continents. Plains that consist mainly of sediments show the largest peak energy ratios. However, peak delay times observed at the plains are much longer than the others, which suggests a different mechanism for generating the amplitudes in the transverse component.

show abstract

Spatial distribution of lateral heterogeneity in the upper mantle around the western Pacific region as inferred from analysis of transverse components of teleseismic P‐coda

Cited by 21 publications

References 7 publications

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

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

Deep Earth Structure: Seismic Scattering in the Deep Earth

Heterogeneity of the Japanese islands as inferred from transverse component analyses of teleseismic P-waves observed at a seismic station network, Hi-net

Contact Info

Product

Resources

About