- 1. Name: Kaoru SAWAZAKI

- 2. Research fields: Seismology

- 3. List of publications and presentations

- (1) Reviewed Papers
__Sawazaki K.__, T. Nakamura (2020), “N”-shaped Y/X coda spectral ratio observed for in-line-type OBS networks; S-net and ETMC: interpretation based on natural vibration of pressure vessel,*Earth, Planets, and Space*, 72,130, doi:10.1186/s40623-020-01255-6.- Omi T., Y. Ogata, K. Shiomi, B. Enescu,
__K. Sawazaki__, and K. Aihara (2019), Implementation of a real-time system for automatic aftershock forecasting in Japan,*Seismol. Res. Lett.*, 90(1), 242-250, doi:10.1785/0220180213. __Sawazaki K.__, T. Saito, and K. Shiomi (2018), Shallow temporal changes in S-wave velocity and polarization anisotropy associated with the 2016 Kumamoto earthquake sequence, Japan,*J. Geophys. Res. Solid Earth*, 123(11), 9899-9913, doi:10.1029/2018JB016261.__Sawazaki K.__(2017), A review of subsurface structure changes associated with large earthquakes and its recovery process,*Zisin*, 2(70), 57-79. (in Japanese)__Sawazaki K.__, H. Nakahara, and K. Shiomi (2016), Preliminary estimation of high-frequency (4-20 Hz) energy released from the 2016 Kumamoto, Japan, earthquake sequence,*Earth, Planets, and Space*, 68(1),183, doi:10.1186/s40623-016-0557-3.__Sawazaki K.__, T. Saito, T. Ueno, and K. Shiomi (2016), Estimation of seismic velocity change at different depths associated with the 2014 Northern Nagano Prefecture Earthquake, Japan (MW6.2), by joint interferometric analysis of NIED Hi-net and KiK-net records,*Progress in Earth and Planetary Science*, 3(1),36, 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 field before and after the 1 2016 Kumamoto, SW Japan, earthquake sequence,*Geophys. Res. Lett.*, doi:10.1002/2016GL070581. - Omi T., Y. Ogata, K. Shiomi, B. Enescu,
__K. Sawazaki__, and K. Aihara (2016), Automatic aftershock forecasting: A test using real-time seismicity data in Japan,*Bull. Seismol. Soc. Am.*, 106(6), doi:10.1785/0120160100. __Sawazaki K.__, H. Kimura, K. Shiomi, N. Uchida, R. Takagi, and R. K. Snieder (2015), Depth-dependence of seismic velocity change associated with the 2011 Tohoku earthquake, Japan, revealed from repeating earthquake analysis and finite-difference wave propagation simulation,*Geophys. J. Int.*, 201, 741-763, doi:10.1093/gji/ggv014.__Sawazaki K.__, and B. Enescu (2014), Imaging the high-frequency energy radiation process of a main shock and its early aftershock sequence: The case of the 2008 Iwate-Miyagi Nairiku earthquake, Japan,*J. Geophys. Res. Solid Earth*, 119(6), 4729-4746, doi:10.1002/2013JB010539.__Sawazaki K.__, and R. K. Snieder (2013), Time-lapse changes of P- and S-wave velocities and shear-wave splitting in the first year after the 2011 Tohoku earthquake, Japan: shallow subsurface,*Geophys. J. Int.*, 193(1), 238-251, doi:10.1093/gji/ggs080.__Sawazaki K.__, H. Sato, and T. Nishimura (2011), Envelope synthesis of short-period seismograms in 3-D random media for a point shear dislocation source based on the forward scattering approximation: Application to small strike-slip earthquakes in southwest Japan,*J. Geophys. Res. Solid Earth*, 116, B08305, doi:10.1029/2010JB008182.__Sawazaki K.__, H. Sato, H. Nakahara, and T. Nishimura (2009), Time-lapse changes of seismic velocity in the shallow ground caused by strong ground motion shock of the 2000 Western-Tottori Earthquake, Japan, as revealed from coda deconvolution analysis,*Bull. Seismol. Soc. Am.*, 99(1), pp352-366, doi:10.1785/0120080058.__Sawazaki K.__, H. Sato, H. Nakahara, and T. Nishimura (2006), Temporal change in site response caused by earthquake strong motion as revealed from coda spectral ratio measurement,*Geophys. Res. Lett.*, 33, L21303, doi:10.1029/2006GL027938.- Nakahara, H.,
__K. Sawazaki__, N. Takagi, T. Nishimura, H. Sato, and H. Fujiwara (2006), Strong ground motions recorded by a near-source seismographic array during the 16 August 2005 Miyagi-Ken-Oki, JAPAN, earthquake (Mw 7.2),*Earth Planets Space*, 58, pp1555-1559.

- (2) Presentations (First author and international meeting only)
__Sawazaki K.__, T. Nakamura (2020), “N”-shaped Y/X coda spectral ratio observed for in-line type OBS of S-net and ETMC, JpGU-AGU Joint Meeting 2020__Sawazaki, K.__(2019), A forecast of peak ground motion due to aftershocks based on the extreme-value analysis of seismograms, SSA Annual Meeting, 2019__Sawazaki, K.__, T. Saito, T. Ueno, and K. Shiomi (2018), Time-lapse change of S-wave velocity and polarization anisotropy associated with the 2016 Kumamoto earthquake, Japan, 2018 JpGU-AGU joint meeting__Sawazaki, K.__, T. Saito, T. Ueno, and K. Shiomi (2018), Isotropic and anisotropic changes in S-wave velocity in shallow subsurface associated with the 2016 Kumamoto earthquake sequence, Japan, EGU General Assembly 2018__Sawazaki, K.__, T. Saito, T. Ueno, and K. Shiomi (2017), Anisotropic S-wave velocity change in the shallow subsurface associated with the 2016 Kumamoto earthquakes, IAG-IASPEI2017_IASPEI Symposia__Sawazaki K.__，(2017), A new method for early aftershock forecasting and its application to the 2016 Kumamoto earthquakes, Japan， The 8th International Workshop on Natural Disaster Reduction and Management among Japan-Taiwan-Korea__Sawazaki, K.__, K. Shiomi (2017), On high-frequency energy release by aftershocks of several inland large earthquakes in Japan， 2017 JpGU-AGU joint meeting（invited）__Sawazaki, K.__(2016), Spatiotemporal seismic velocity change in the Earth's subsurface associated with large earthquake: contribution of strong ground motion and crustal deformation, AGU 2016 Fall Meeting (invited)__Sawazaki, K.__, T. Saito, T. Ueno, and K. Shiomi (2015), Depth-dependence of time-lapse seismic velocity change detected by a joint interferometric analysis of vertical array data, AGU 2015 Fall Meeting__Sawazaki, K.__, H. Kimura, K. Shiomi, N. Uchida, R. Takagi, and R. K. Snieder (2014), Seismic velocity change associated with the 2011 Tohoku Earthquake, Japan; combination of the phase delay analysis of repeating earthquakes and finite-difference simulation, AOGS 11th Annual Meeting__Sawazaki, K.__, B. Enescu (2013), Imaging the high-frequency energy radiation process of a mainshock and its early aftershock sequence for a crustal earthquake in Japan, AGU 2013 Fall Meeting__Sawazaki, K.__, H. Kimura, N. Uchida, R. Takagi, and R. K. Snieder (2012), Constraining the depth of the time-lapse changes of P- and S-wave velocities in the first year after the 2011 Tohoku earthquake, Japan, AGU 2012 Fall Meeting__Sawazaki, K.__, H. Fujiwara (2010), Retrieval of the cross correlation function in a random inhomogeneous medium for uncorrelated sources using the mean wavefield, AGU 2010 Fall Meeting__Sawazaki, K.__, H. Sato, and T. Nishimura (2008), Simulation of vector-wave envelopes in 3-D random elastic media for non-spherical radiation source based on the stochastic ray path method, AGU 2008 Fall Meeting__Sawazaki, K.__, H. Sato, H. Nakahara, and T. Nishimura (2007), Temporal changes in S-wave velocity structure at a borehole site after strong ground motion , AGU 2007 Fall Meeting.__Sawazaki, K.__, H. Sato, H. Nakahara, and T. Nishimura (2007), Temporal changes in site responses at borehole sites before and after strong motions as revealed from coda wave analyses, IUGG 2007__Sawazaki, K.__, H. Sato, H. Nakahara, and T. Nishimura (2006), Temporal change in site response caused by earthquake strong motion as revealed from coda spectral ratio measurement, AGU 2006 Fall Meeting

- 4. Affiliated societies

- Seismological Society of Japan (SSJ)
- Japan Association for Earthquake Engineering (JAEE)
- Japan Geoscience Union (JpGU)
- American Geophysical Union (AGU)

- 5. Research Grants

- 2017/4-2021/3，"Measurement of streamflow using seismograms"，The Taisei Foundation 2020 Research Grant
- 2017/4-2021/3，"Development of quasi-realtime forecasting of aftershock activity from continuous seismograms"，JSPS Grant-in-Aid for Young Scientists (B)，Grant-No. 17K14385
- 2013/10-2015/3，"Monitoring of foreshock activities from analysis of continuous ground vibration records"，JSPS Grant-in-Aid for Research Activity Start-up，Grant-No. 30707170
- 2010/4-2013/3，"Research of seismic energy release process on the basis of the high-frequency source inversion"，JSPS Research Fellowship for Young Scientists（PD），Grant No. 10J01224
- 2007/4-2010/3，"Development and application of high-frequency strong-motion synthesis method on the basis of a scattering theory in random inhomogeneous media"，JSPS Research Fellowship for Young Scientists（DC1），Grant No. 07J02043

- 6. Other activitiies

- 2019/4-，"Zisin" Editorial board

- 6. Recent research topic

- Monitoring and modeling of subsurface structural changes
- Quasi-realtime forecasting of aftershock activity
- Other topics using seismograms

- 7. Curriculum Vitae

- B.S., Geophysics, Tohoku University, 2005
- M.A., Geophysics, Tohoku University, 2007
- Ph.D., Geophysics, Tohoku University, 2010
- JSPS Research Fellow (DC1), 2007-2010
- JSPS Research Fellow (PD), 2010-2013
- Visiting Researcher, Colorado School of Mines, 2011-2012
- Research Fellow, NIED, 2013-

- 8. Awards

- SSJ (Seismological Society of Japan) Young Scientist Award, 2015

- back to member list

2020/9/16 updated