1．Name: Tatsuhiko SAITO
2．Research fields: Seismology
Tatsuhiko Saito received Ph. D. at the Tohoku University, Japan in 2003, where he studied scattering theories for applications to and interpretations of high-frequency seismograms. After the graduation, as postdoc researcher, he continued to work on the investigation of seismic-wave propagation through heterogeneous earth at AIST, and extended his research interests to seismic and tsunami generation using high-performance computing techniques on supercomputers at the University of Tokyo. He then moved to the National Research Institute for Earth Science and Disaster Prevention (NIED) in 2010 and has been working there as senior researcher. After the 2011 Tohoku-Oki great earthquake, the NIED has started a new observational project, which plans to deploy more than 150 online seismic/tsunami sensors off the Pacific coast of eastern Japan to detect the tsunami generation inside the focal area in real time. He is currently engaged in a basic research for earthquake and tsunami.
3．List of publications and presentations
- Saito T. and H. Tsushima, (2016), Synthesizing ocean bottom pressure records including seismic wave and tsunami contributions: Toward realistic tests of monitoring systems, J. Geophys. Res. Solid Earth, 121, 8175–8195, doi:10.1002/2016JB013195.
- Saito T., (2016), A tsunami generation theory: surface height, velocity, and pressure, Zisin2, 68, 135-145,doi:10.4294/zisin.68.135.
- Saito T., D. Inazu, T. Miyoshi, R. Hino (2014), Dispersion and nonlinear effects in the 2011 Tohoku-Oki earthquake tsunami, J. Geophys. Res. Ocean, doi:10.1002/2014JC009971 .
- Saito T. (2013), Dynamic tsunami generation due to sea-bottom deformation: Analytical representation based on the linear potential theory, Earth, Planets and Space, 65, 1411-1423, doi:10.5047/eps.2013.07.004. (2014 Research Paper Award of the Seismological Society of Japan)
- Saito T., D. Inazu, S. Tanaka, and T. Miyoshi (2013), Tsunami coda across the Pacific Ocean following the 2011 Tohoku-Oki earthquake, Bull. Seismol. Soc. Am., 103, 1429-1443, doi:10.1785/0120120183.
- Saito T., and J. Kawahara (2012), Retrieval of long-wave tsunami Green's function from the cross-correlation of continuous ocean waves excited by far-field random noise sources on the basis of a first-order Born approximation, Earth, Planets and Space,64, 43-48, doi:10.5047/eps.2011.08.020 (free access, highlight papers).
- Saito T., Y. Ito, D. Inazu, and R. Hino (2011), Tsunami source of the 2011 Tohoku-Oki earthquake, Japan: Inversion analysis based on dispersive tsunami simulations, Geophys. Res. Lett., doi:10.1029/2011GL049089.
- Saito T., T. Matsuzawa, K. Obara and T. Baba (2010), Dispersive tsunami of the 2010 Chile earthquake recorded by the high-sampling-rate ocean-bottom pressure gauges, Geophys. Res. Lett., doi:10.1029/2010GL045290.
- Saito T. (2010), Love wave excitation due to the interaction between a propagating ocean wave and the sea-bottom topography, Geophys. J. Int., 182, doi:10.1111/j.1365-246X.2010.04695.
- Saito T., K. Satake and T. Furumura (2010), Tsunami waveform inversion including dispersive waves: the 2004 off Kii Peninsula earthquake, Japan , J. Geophys. Res., 115, B06303, doi:10.1029/2009JB006884.
- Saito T. and T. Furumura (2009), Three-dimensional tsunami generation simulation due to sea-bottom deformation and its interpretation based on the linear theory, Geophys. J. Int., 178, doi:10.1111/j.1365-246X.2009.04206
- Saito T. and T. Furumura (2009), Three-dimensional simulation of tsunami generation and propagation: Application to intraplate events, J. Geophys. Res., 114, B02307, doi:10.1029/2007JB005523.
- Saito T. and T. Furumura (2009), Scattering of linear long-wave tsunamis due to randomly fluctuating sea-bottom topography: coda excitation and scattering attenuation, Geophys. J. Int., 177, doi: 10.1111/j.1365-246X.2009.03988.x.
- Saito, T. (2009), Scattering theory for short-period seismic waves: Velocity shift and envelopes in random media ,
Zisin2, in press, (in Japanese with English abstract)
- Saito T., H. Sato, and T. Takahashi (2008), Direct simulation methods for scalar-wave envelopes in two-dimensional layered random media based on the small-angle scattering approximation, Commun. Comput. Phys., 3, 63-84.
- Saito T. (2006), Velocity shift in two-dimensional anisotropic random media using the Rytov method, Geophys. J. Int., 166, 293-308, doi: 10.1111/j.1365-246X.2006.02976.x.
- Saito T. (2006), Synthesis of scalar-wave envelopes in two-dimensional weakly anisotropic random media using the Markov approximation, Geophys. J. Int., 165, 501-515, doi: 10.1111/j.1365-246X.2006.02896.x.
- Saito T., H. Sato, M. Ohtake and K. Obara (2005), Unified explanation of envelope broadening and maximum-amplitude decay of high-frequency seismograms based on the envelope simulation using the Markov approximation: forearc side of the volcanic front in northeastern Honshu, Japan, J. Geophys. Res., 110, B01304,doi:10.1029/2004JB003225
- Saito T., H. Sato, M. Fehler and M. Ohtake (2003), Simulating the envelope of scalar-waves in 2-D random media having power-law spectra of velocity fluctuation, Bull. Seismol. Soc. Am., 2003, 93, 240-252
- Saito T., H. Sato, and M. Ohtake (2002), Envelope broadening of spherically outgoing waves in three-dimensional random media having power-law spectra, J. Geophys. Res., 107(B5), 2089, doi:10.1029/2001JB000264
- Heidarzadeh, M., S. Murotani, K. Satake, T. Takagawa, and T. Saito (2017), Fault size and depth extent of the Ecuador earthquake (Mw 7.8) of 16 April 2016 from teleseismic and tsunami data, Geophysical Research Letters, doi:10.1002/2017GL072545
- Takemura, S., K. Shiomi, and T. Saito (2017), Sequence of deep-focus earthquakes beneath the Bonin Islands identified by the NIED nationwide dense seismic networks Hi-net and F-net, Earth Planet Space 69: 38. doi:10.1186/s40623-017-0625-3
- Takemura, S., K. Shiomi, T. Kimura, and T. Saito (2016), Systematic difference between first-motion and waveform-inversion solutions for shallow offshore earthquakes due to a low-angle dipping slab, Earth Planet Space 68: 149. doi:10.1186/s40623-016-0527-9
- Sawazaki, K., T. Saito, T. Ueno, and K. Shiomi (2016), Estimation of seismic velocity changes at different depths associated with the 2014 Northern Nagano Prefecture earthquake, Japan (M W 6.2) by joint interferometric analysis of NIED Hi-net and KiK-net records, Progress in Earth and Planetary Science, DOI: 10.1186/s40645-016-0112-7
- Yoshida, K., A. Hasegawa, T. Saito, Y. Asano, S. Tanaka, K. Sawazaki, Y. Urata, and E. Fukuyama (2016), Stress rotations due to the M6.5 foreshock and M7.3 main shock in the 2016 Kumamoto, SW Japan, earthquake sequence, Geophys. Res. Lett., 43, 10,097–10,104, doi:10.1002/2016GL070581
- Inazu, D., N. Pulido, E. Fukuyama,T. Saito, J. Senda, and H. Kumagai (2016),Near‑field tsunami forecast system based on near real‑time seismic moment tensor estimation in the regions of Indonesia, the Philippines, and Chile, Earth, Planets and Space, 68:73, DOI 10.1186/s40623-016-0445-x
- Kim, S.,T. Saito, E. Fukuyama, T.-S. Kang (2016),The Nankai Trough earthquake tsunamis in Korea: numerical studies of the 1707 Hoei earthquake and physics‑based scenarios, Earth, Planets and Space, 68:64, DOI 10.1186/s40623-016-0438-9
- Inazu, D. and T. Saito (2015), Global tsunami simulation using a grid rotation transformation in a latitude-longitude coordinate system, Natural Hazards, 10.1007/s11069-015-1995-0
- Ueno, T., T. Saito, K. Shiomi, and Y. Haryu (2015), Monitoring the instrument response of the high-sensitivity seismograph network in Japan (Hi-net): effects of response changes on seismic interferometry analysis, Earth, Planets and Space, 67, 1-10, doi:10.1186/s40623-015-0305-0
- Miyoshi, T., T. Saito, D. Inazu, and S. Tanaka (2015), Tsunami modeling from the seismic CMT solution considering the dispersive effect: a case of the 2013 Santa Cruz Islands tsunami, Earth, Planets and Space, 67,1-7,DOI: 10.1186/s40623-014-0179-6
- Inazu, D., and T. Saito (2014), Two subevents across the Japan Trench during the 7 December 2012 off Tohoku earthquake (Mw 7.3) inferred from offshore tsunami records, J. Geophys. Res, DOI: 10.1002/2013JB010892
- Inazu, D., and T. Saito (2013), Simulation of distant tsunami propagation with a radial loading deformation effect, Earth, Planets and Space, 65, 835-842
- Kimura, T., S. Tanaka, and T. Saito (2013), Ground tilt changes in Japan caused by the 2010 Maule, Chile, earthquake tsunami, J. Geophsy. Res., doi: 10.1029/2012JB009657
- Ueno,T, T. Saito, K. Shiomi, B. Enescu, H. Hirose, and K. Obara (2012), Fractional seismic velocity change related to magma intrusions during earthquake swarms in the eastern Izu Peninsula, central Japan, J. Geophsy. Res., doi: 10.1029/2012JB009580
- Matsuzawa, T., K. Obara, T. Maeda, Y. Asano and T. Saito (2012), Love- and Rayleigh-Wave Microseisms Excited by Migrating Ocean Swells in the North Atlantic Detected in Japan and Germany, Bull. Seismol. Soc. Am., doi: 10.1785/0120110269
- Takemoto,T, T. Furumura, T. Saito, T. Maeda, and S. Noguchi(2012), Spatial‐ and Frequency‐dependent properties of site amplification factors in Japan derived by the coda normalization method, Bull. Seismol. Soc. Am., 102, 1462-1476, doi: 10.1785/0120110188.
- Miyoshi, T., T. Saito, and K. Shiomi (2012), Waveguide effects within the Philippine Sea slab beneath southwest Japan inferred from guided SP converted waves, Geophys. J. Int., 189, 1075-1084
- Asano, Y., T. Saito, Y. Ito, K. Shiomi, H. Hirose, T. Matsumoto, S. Aoi, S. Hori, and S. Sekiguchi (2011), Spatial distribution and focal mecanisms of aftershocks of the 2011 off the Pacific Coast of Tohoku Earthquake, Earth, Planets and Space, 63, 669-673
- Maeda, T., K. Obara, T. Furumura, and T. Saito (2011), Interference of long-period seismic wavefield observed by dense Hi-net array in Japan, J. Geophsy. Res., doi: 10.1029/2011JB008464
- Kumagai, H., T. Saito, G. O'Brien, and T. Yamashina (2011), Characterization of scattered seismic wavefields simulated in heterogeneous media with topography, J. Geophsy. Res., doi: 10.1029/2010JB007718
- Takemura, S., T. Furumura, and T. Saito (2009), Distortion of the apparent S-wave radiation pattern in the high-frequency wavefield: Tottori-Ken Seibu, Japan, earthquake of 2000, Geophys. J. Int., doi: 10.1111/j.1365-246X.2009.04210.x
- Furumura, T. and T. Saito (2009), Integrated ground motion and tsunami simulation for the 1944 Tonankai earthquake using high-performance supercomputers, Journal of Disaster Research, 4, 118-126.
- Sato, H., M. Fehler, and T. Saito (2004), Hybrid synthesis of scalar wave envelopes in two-dimensional random media having rich short-wavelength spectra, J. Geophys. Res, 109, B06303, doi:10.1029/2003JB002673
- Matsumoto, S., K. Obara, K. Yoshimoto, T. Saito, A. Ito, and A. Hasegawa (2001), Temporal change in P-wave scatterer distribution associated with the M6.1 earthquake near Iwate volcano, northeastern Japan, Geophys. J. Int., 145, 48 - 58.
- Matsumoto, S., K. Obara, K. Yoshimoto, T. Saito, A. Hasegawa, and A. Ito (1999)，Imaging of Inhomogeneous Structure of the Crust beneath Ou Backbone Range, Northeastern Japan, Based on Small Aperture Seismic Array Observations，
Zisin2, 52, 283 - 297 (In Japanese with English abstract).
- Saito T. (2012), Linear potential theory for tsunami generation and propagation note
- 2015, Research Paper Award of the Seismological Society of Japan (Saito 2013EPS)
- 2013, Award of NIED.
- 2010, Young Scientist Award, Seismological Society of Japan.
- 2007, Next-Generation Super Computing Symposium 2007, Poster Session, Grand Prix, RIKEN.
- 2004, Aoba Society for the Promotion of Science Prize
- Seismological Society of Japan
- Society of Exploration Geophysicists of Japan
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