Analysis of S-wave seismogram envelope of deep earthquakes and estimation of random inhomogeneities in the Kanto-Tokai area

Details Analysis of S-wave seismogram envelope of deep earthquakes and estimation of random inhomogeneities in the Kanto-Tokai area Analysis of S-wave seismogram envelope of deep earthquakes and estimation of random inhomogeneities in the Kanto-Tokai area

Mar 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993esdp.rept...41o&link_type=abstract

In its Report of the National Research Institute for Earth Science and Disaster Prevention, No. 51 p 41-202 (SEE N94-27985 07-46

Mathematics

Logic

Earth Crust, Earth Planetary Structure, Earthquakes, Inhomogeneity, S Waves, Seismic Waves, Statistical Analysis, Structural Properties (Geology), Wave Propagation, Amplitudes, Crustal Fractures, Earth (Planet), Geological Faults, Japan, P Waves, Planetary Structure, Root-Mean-Square Errors, Seismographs

Scientific paper

Seismogram envelopes around direct S waves of deep earthquakes which occurred in the subducting Pacific plate were analyzed based on the parabolic approximation and random inhomogeneity of the upper mantle and the crust. The upper mantle and the crust were investigated in the Kanto-Tokai area, Japan. The time lags of the maximum peak arrival and the half-maximum arrival were measured from the S wave onset of Band Path Filter (BPF)-Root Mean Square (RMS) traces of a horizontal seismogram at some frequency bands. The dependence of shape of the envelopes on frequency and travel distance was examined. The random inhomogeneity beneath the east edge of the seismic network was estimated to be represented by the Gaussian Autocorrelation Function (ACF). The function type is a little bit close to the exponential type in the west part of the volcanic front. The difference in the ACF type might be attributed to the difference in the short wavelength component's inhomogeneity.

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