Tatsuhiko Saito

© 2016, The Author(s). To estimate the seismic velocity changes at different depths associated with a large earthquake, we apply passive image interferometry to two types of seismograms: KiK-net vertical pairs of earthquake records and Hi-net cont...

A tsunami coda lasting more than 5 days was clearly recorded across the Pacific Ocean following the 2011 Tohoku-Oki earthquake. We found that the coda energy per unit area (elapsed time of 60-96 hr from the earthquake origin time) does not show a ...

We have estimated broadband (f=0:5-8 Hz) site amplification factors at 1800 sites in Japan based on the coda normalization method using 4001 seismograms obtained from 48 events. The results show that, in the low-frequency band (f=0:5-1 Hz), the si...

The distortion properties of the apparent S-wave radiation pattern in the high-frequency seismic wavefield of over f > 2 Hz is investigated using a large number of waveform records of the main shock and 29 aftershocks of the Tottori-Ken Seibu, Jap...

Due to the Earth's inhomogeneity, seismogram envelopes increase in duration and decrease in amplitude with increasing travel distance. Those features have been explained on the basis of the forward scattering in random media using the Markov appro...

Wave trains in high-frequency seismograms of local earthquakes are mostly composed of incoherent waves that are scattered by distributed heterogeneities within the lithosphere. Their phase variations are very complex; however, their wave envelopes...