- Theme of my research

- Short-period seismology (Generation and propagation of short-period seismic waves)

- Recent research subjects

- Estimating the spatial distribution of short-period seismic energy radiation on earthquake faults

- Strong-motion array observation at Oshika, Miyagi Prefecture, Japan (Direct observation of earthquake ruptures)

- Seismic interferometry (Green's function retrieval from cross-correlations of wavefields)

- Energy partitioning in diffuse waves (Application to shallow subsurface surveys)

- Constraining fault areas of historical earthquakes with seismic intensity distributions

(Learning lessons from the Tohoku-Oki earthquake)

- Spatial correlation of elastic-wave
fields in random heterogeneous media based
on numerical simulations

(Implications for structural heterogeneities around earthquake sources)

- Previous studies

- Estimation of the spatial distribution of
short-period seismic energy on earthquake
faults:
- 11. The 2011 Tohoku-Chiho-Taiheiyo-Oki (Tohoku-Oki), Japan, earthquake (Mw 9.0)
- 10. The 2008 Iwate-Miyagi Nairiku, Japan, earthquake (Mw 6.9)
- 9. The 2005 Miyagi-Ken-Oki, Japan, earthquake (Mw 7.2)
- 8. The 2004 Niigata-Ken Chuetsu, Japan, earthquake (Mw 6.6)
- 7. The 2003 Tokachi-Oki, Japan, earthquake (Mw 8.0)
- 6. The 2003 Miyagi-Ken-Oki, Japan, earthquake (Mw 7.0)
- 5. The 2000 Tottori-Ken-Seibu, Japan, earthquake (Mw 6.6)
- 4. The 1999 Chi-Chi, Taiwan, earthquake (Mw 7.6)
- 3. The 1998 Iwate-Ken-Hokubu, Japan, earthquake (Mw 5.8)
- 2. The 1995 Hyogo-Ken-Nanbu (Kobe) , Japan, earthquake (Mw 6.8)
- 1. The 1994 off Sanriku, Japan, earthquake (Mw 7.7)

- Broad-band source analysis by inversion analyses
of long-period seismograms and short-period
seismogram envelopes:
- 1. The 1998 Iwate-Ken-Hokubu, Japan, earthquake (Mw 5.8)

- Estimation of scattering and intrinsic parameters
in the upper crust by the multiple lapse
time window analysis (MLTWA)
- 1. Central Taiwan
- 2. Around the Iwate volcano, Japan
- 3. Around the source region of the 1995 Kobe earthquake, Japan

- Calculation of seismogram envelopes in heterogeneous
media
- Numerical calculation for a non-spherically radiating source in a medium with depth-dependent background velocity structure based on Yoshimoto's Monte Carlo method
- Analytical calculation for a non-spherically radiating source in a medium with homogeneous background velocity structure

- Detection of short-wavelength heterogeneities
around earthquake source regions
- Cross-correlation characteristics of seismograms for neighbouring events -Implications for the heterogeneous structure around the source region of the 1995 Kobe event

- Seismic observation
- Strong-motion observation around the Iwate volcano, Japan