1. Name: Kaoru SAWAZAKI

2. Research fields: Seismology

3. List of publications and presentations

(1) Reviewed Papers

• P.C.Shakti, Sawazaki K. (2021), River discharge prediction for ungauged mountainous river basins during heavy rain events based on seismic noise data, Progress in Earth and Planetary Science, in press, doi:10.1186/s40645-021-00448-1.

• Sawazaki K. (2021), Early Forecast of Maximum Amplitude due to Aftershocks by Applying Extreme Value Statistics to a Single Continuous Seismogram, Bull. Seismol. Soc. Am., 111(5), pp2825-2845, doi:10.1785/0120200365.

• Marc O., C. Sens-Schonfelder, L. Illien, P. Meunier, M. Hobiger, K. Sawazaki, C. Rault, and N. Hovius (2021), Toward Using Seismic Interferometry to Quantify Landscape Mechanical Variations after Earthquakes, Bull. Seismol. Soc. Am., 111(3), pp1631-1649, doi:10.1785/0120200264.

• 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. (2021)， Extreme value statistics of interval maximum amplitudes due to aftershocks and its application for early forecast， EGU General Assembly 2021

• Sawazaki K., T. Nakamura (2020), “N”-shaped Y/X coda amplitude spectral ratio observed for in-line type OBS networks: interpretation based on the natural vibration of the pressure vessel, AGU 2020 Fall Meeting

• 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)
• Japan Society of Hydrology and Water Resources(JSHWR)
• American Geophysical Union (AGU)

5. Research Grants

• 2021/7-, Seismology TowArd Research innovation with data of Earthquake (STAR-E) Project，Co-I, Grant-No. JPJ010217
• 2021/4-, JSPS Grant-in-Aid for Scientific Research (C)，PI, Grant-No. JP21K03686
• 2020/4-，The Taisei Foundation 2020 Research Grant, PI
• 2019/4-，JSPS Grant-in-Aid for Scientific Research (B), Co-I, Grant-No. JP19H01982
• 2017/4-2021/3，JSPS Grant-in-Aid for Young Scientists (C)，PI, Grant-No. JP17K14385
• 2013/10-2015/3，JSPS Grant-in-Aid for Research Activity Start-up，PI, Grant-No. JP30707170 　
• 2010/4-2013/3，JSPS Research Fellowship for Young Scientists（PD），PI, Grant No. JP10J01224
• 2007/4-2010/3，JSPS Research Fellowship for Young Scientists（DC1），PI, Grant No. JP07J02043

6. Other activitiies

• 2021-, JpGU Fall Meeting，"Seismic wave propagation: Theory and Application" session main convenor
• 2019-2020，"Zisin" Editorial board

6. Recent research topic

• Monitoring and modeling of subsurface structural changes
• Quasi-realtime forecasting of aftershock activity
• Quasi-realtime forecasting of river discharge using seismograms
• 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

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2021/10/19 updated