Imaging laterally varying regional heterogeneities from seismic coda using a source-array analysis

Tae Kyung Hong, William Menke

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Seismic coda is composed of scattered waves originated from various kinds of heterogeneities, whose locations are not confined in the great-circle ray-path direction between the source and receiver. We devise a technique to image laterally varying regional heterogeneities using single-station seismograms for clustered events. We analyze regional seismic records of the Borovoye seismic station for the Balapan nuclear explosions in Kazakhstan. Scattered waves that arrive coherently over the source arrays, are extracted by directional beamformings. The locations of scatterers responsible for the scattered waves are mapped from the beamforming direction, travel time and slowness (equivalently, phase velocity). The illuminated locations of heterogeneities are highly correlated with the structural variations in surface topography, crustal thickness and sedimentary thickness. The influence of the structural variations on seismic waves is quantified in terms of scattering intensity and quality factor. The scattering properties are observed to vary with phase due to the difference in frequency content and phase velocity. The proposed technique appears to be useful for a study of active tectonic regions with limited monitoring stations.

Original languageEnglish
Pages (from-to)188-202
Number of pages15
JournalPhysics of the Earth and Planetary Interiors
Volume166
Issue number3-4
DOIs
Publication statusPublished - 2008 Feb 1

Fingerprint

coda
stations
beamforming
phase velocity
scattering
great circles
Kazakhstan
nuclear explosions
nuclear explosion
seismograms
seismic waves
crustal thickness
seismogram
seismic wave
travel time
travel
Q factors
tectonics
rays
topography

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Geophysics
  • Physics and Astronomy (miscellaneous)
  • Space and Planetary Science

Cite this

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abstract = "Seismic coda is composed of scattered waves originated from various kinds of heterogeneities, whose locations are not confined in the great-circle ray-path direction between the source and receiver. We devise a technique to image laterally varying regional heterogeneities using single-station seismograms for clustered events. We analyze regional seismic records of the Borovoye seismic station for the Balapan nuclear explosions in Kazakhstan. Scattered waves that arrive coherently over the source arrays, are extracted by directional beamformings. The locations of scatterers responsible for the scattered waves are mapped from the beamforming direction, travel time and slowness (equivalently, phase velocity). The illuminated locations of heterogeneities are highly correlated with the structural variations in surface topography, crustal thickness and sedimentary thickness. The influence of the structural variations on seismic waves is quantified in terms of scattering intensity and quality factor. The scattering properties are observed to vary with phase due to the difference in frequency content and phase velocity. The proposed technique appears to be useful for a study of active tectonic regions with limited monitoring stations.",
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Imaging laterally varying regional heterogeneities from seismic coda using a source-array analysis. / Hong, Tae Kyung; Menke, William.

In: Physics of the Earth and Planetary Interiors, Vol. 166, No. 3-4, 01.02.2008, p. 188-202.

Research output: Contribution to journalArticle

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AB - Seismic coda is composed of scattered waves originated from various kinds of heterogeneities, whose locations are not confined in the great-circle ray-path direction between the source and receiver. We devise a technique to image laterally varying regional heterogeneities using single-station seismograms for clustered events. We analyze regional seismic records of the Borovoye seismic station for the Balapan nuclear explosions in Kazakhstan. Scattered waves that arrive coherently over the source arrays, are extracted by directional beamformings. The locations of scatterers responsible for the scattered waves are mapped from the beamforming direction, travel time and slowness (equivalently, phase velocity). The illuminated locations of heterogeneities are highly correlated with the structural variations in surface topography, crustal thickness and sedimentary thickness. The influence of the structural variations on seismic waves is quantified in terms of scattering intensity and quality factor. The scattering properties are observed to vary with phase due to the difference in frequency content and phase velocity. The proposed technique appears to be useful for a study of active tectonic regions with limited monitoring stations.

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