Scattering of teleseismic body waves along the Hayward-Calaveras fault system

C. A. Langston, Charles James Ammon

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Broadband, digital, teleseismic P-wave data from the University of California, Berkeley, stations BKS, MHC, and SAO are used to study the character of teleseismic P coda. Velocity heterogeneity in structure near these stations gives rise to a variety of scattering effects, which include azimuthly dependent receiver functions, large tangential component particle motions, and high levels of P coda. P codas for shallow and deep teleseisms are analyzed for three frequency bands centered at 1.5, 0.75 and 0.375 Hz. Observed coda decay rate and level are fit with an energy flux theory to parameterize scattering effects near the source and at the receiver. Coda decay rate and level for deep earthquakes are seen to be stable observables between stations, implying that the scattered coda field is homogeneously distributed over the receiver network validating a major assumption in the energy flux model. Scattering Q(Qs) is not particularly well constrained by the data and is inferred to be affected by focusing and defocusing effects of the direct P waves. -from Authors

Original languageEnglish (US)
Pages (from-to)576-591
Number of pages16
JournalBulletin - Seismological Society of America
Volume81
Issue number2
StatePublished - Jan 1 1991

Fingerprint

teleseismic wave
coda
body wave
receivers
stations
scattering
Scattering
P waves
decay rates
Fluxes
defocusing
particle motion
energy flux
Frequency bands
P-wave
Earthquakes
earthquakes
broadband
energy
earthquake

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Geochemistry and Petrology

Cite this

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abstract = "Broadband, digital, teleseismic P-wave data from the University of California, Berkeley, stations BKS, MHC, and SAO are used to study the character of teleseismic P coda. Velocity heterogeneity in structure near these stations gives rise to a variety of scattering effects, which include azimuthly dependent receiver functions, large tangential component particle motions, and high levels of P coda. P codas for shallow and deep teleseisms are analyzed for three frequency bands centered at 1.5, 0.75 and 0.375 Hz. Observed coda decay rate and level are fit with an energy flux theory to parameterize scattering effects near the source and at the receiver. Coda decay rate and level for deep earthquakes are seen to be stable observables between stations, implying that the scattered coda field is homogeneously distributed over the receiver network validating a major assumption in the energy flux model. Scattering Q(Qs) is not particularly well constrained by the data and is inferred to be affected by focusing and defocusing effects of the direct P waves. -from Authors",
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Scattering of teleseismic body waves along the Hayward-Calaveras fault system. / Langston, C. A.; Ammon, Charles James.

In: Bulletin - Seismological Society of America, Vol. 81, No. 2, 01.01.1991, p. 576-591.

Research output: Contribution to journalArticle

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AU - Langston, C. A.

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N2 - Broadband, digital, teleseismic P-wave data from the University of California, Berkeley, stations BKS, MHC, and SAO are used to study the character of teleseismic P coda. Velocity heterogeneity in structure near these stations gives rise to a variety of scattering effects, which include azimuthly dependent receiver functions, large tangential component particle motions, and high levels of P coda. P codas for shallow and deep teleseisms are analyzed for three frequency bands centered at 1.5, 0.75 and 0.375 Hz. Observed coda decay rate and level are fit with an energy flux theory to parameterize scattering effects near the source and at the receiver. Coda decay rate and level for deep earthquakes are seen to be stable observables between stations, implying that the scattered coda field is homogeneously distributed over the receiver network validating a major assumption in the energy flux model. Scattering Q(Qs) is not particularly well constrained by the data and is inferred to be affected by focusing and defocusing effects of the direct P waves. -from Authors

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