Abstract
Abstract Spatial distribution of S-wave scatterers in the SE part of the focal area of the 2005 West Off Fukuoka Prefecture Earthquake (M = 7.0) has been estimated using dense seismic array data. Waveforms of 22 natural earthquakes were analyzed in a frequency range of 16–24 Hz. It is difficult to estimate the inhomogeneous structure in this wavelength range with ordinary travel time tomography despite the importance of this parameter for understanding the earthquake-generating process. After filtering and gain recovery in the coda part, observed waveforms were semblance-enhanced slant-stacked into various directions from the array. This was followed by diffraction curve summation in order to image the scatterer distribution. The spatial distribution of scatterers thus imaged revealed that higher strengths were distributed at the SE-extension of the fault plane of the event, which corresponds to a region where the rupture process of the main shock stopped
Highlights
In general, many phases appear in the seismogram of natural earthquakes and artificial explosions following the arrival of direct P- and S-waves
If we analyze seismograms recorded by a small aperture array with stations several tens of meters apart, the ray direction approaching the array could be determined in more detail
Matsumoto et al (1998) imaged the scatterer distribution around the focal area of the 1995 Kobe earthquake from the slant-stacked waveform obtained by a small aperture array
Summary
Many phases appear in the seismogram of natural earthquakes and artificial explosions following the arrival of direct P- and S-waves. Matsumoto et al (1998) imaged the scatterer distribution around the focal area of the 1995 Kobe earthquake from the slant-stacked waveform obtained by a small aperture array. An estimation of scatterer distribution around the focal area using dense seismic array data and discuss the characteristics of the earthquake from the perspective of an inhomogeneous structure.
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