The Seismology Laboratory in the Department of Natural History Sciences at Hokkaido University is engaged in a variety of seismological researches. Research topics include theoretical studies on seismic wave propagation, global and regional earth structures, the development of techniques for waveform analysis and geophysical inversion, studies on seismic sources and fault dynamics, and broadband seismology in active volcanic areas. Further details of the group's current research activities can be found on the Research Projects page.

Mar, 2019

[New paper] Matsuzawa, H., and K. Yoshizawa (2019), Array-based analysis of multi-mode surface waves: Application to phase speed measurements and modal waveform decomposition, Geophys. J. Int., ggz153, https://doi.org/10.1093/gji/ggz153

Jan, 2019

[New paper] Isse, T., H. Kawakatsu, K. Yoshizawa, A. Takeo, H. Shiobara, H. Sugioka, A. Ito, D. Suetsugu, and D. Reymond (2019), Surface wave tomography for the Pacific Ocean incorporating seafloor seismic observations and plate thermal evolution, Earth Planet. Sci. Lett., 510, 116–130, doi:10.1016/j.epsl.2018.12.033.

July, 2018

[Award] Hitoshi Matsuzawa (PhD student) won an Outstanding Student Presentation Award for his poster presentation in the Solid Earth Sciences Section at JpGU Meeting 2018.

May, 2018

[Award] Motohiro Tsuzuki (PhD student) won a 2017 Best Paper Award for his paper published in Zisin (Journal of Seismological Society of Japan).

Nov, 2017

[Award] Shuya Okuyama (MSc student) won an Outstanding Student Presentation Award for his oral presentation at SSJ (Seismological Soceity of Japan) Fall Meeting 2017.

Jul, 2017

[New paper] Kennett, B. L. N., Yoshizawa, K. and Furumura T. (2017) Interactions of multi-scale heterogeneity in the lithosphere: Australia, Tectonophysics, 717, 193-213, doi:10.1016/j.tecto.2017.07.009.

Nov, 2016

[Award] Hitoshi Matsuzawa (MSc student) won an Outstanding Student Presentation Award for his oral presentation at SSJ (Seismological Soceity of Japan) Fall Meeting 2016.

July, 2016

[Award] Kouta Hamada (PhD student) won an Outstanding Student Presentation Award for his poster presentation in the Solid Earth Sciences Section at JpGU Meeting 2016.

Jan, 2016

[New paper] Nakashima, Y., Heki, K., Takeo, A., Cahyadi, M.N., Aditiya A. and Yoshizawa, K. (2016) Atmospheric resonance oscillations by the 2014 eruption of the Kelud volcano, Indonesia, observed with the ionospheric total electron contents and seismic signals, Earth Planet. Sci. Lett., 434, 112-116, doi:10.1016/j.epsl.2015.11.029.

Nov, 2015

[Award] Kouta Hamada (PhD student) won a Student Author Award for the best papers from Geophysical Journal International.
(Announcement by GJI)

July, 2015

[New paper] Hamada, K. and Yoshizawa, K. (2015) Interstation phase speed and amplitude measurements of surface waves with non-linear waveform fitting: Application to USArray, Geophys. J. Int., 202, 35-54, doi:10.1093/gji/ggv213.

May, 2015

[New paper] Yoshizawa, K. and Kennett, B.L.N. (2015) The lithosphere-asthenosphere transition and radial anisotropy beneath the Australian continent, Geophys. Res. Lett., 42, 3839-3846, doi:10.1002/2015GL063845.

Apr, 2015

[New paper] Ogiso, M., and Yomogida, K. (2015) Estimation of locations and migration of debris flows on Izu-Oshima Island, Japan, on 16 October 2013 by the distribution of high frequency seismic amplitudes, J. Volcanol. Geoth. Res., 298, 15–26.

Apr, 2015

We welcome new student members.
(3 undergrads, 1 postgraduate and 1 international stduent.)

Aug, 2014

[New paper] Yoshizawa, K. (2014) Radially anisotropic 3-D shear wave structure of the Australian lithosphere and asthenosphere from multi-mode surface waves, Phys. Earth Planet. Inter., 235, 33-48.

July 2014

[New paper] Takeo, A., Forsyth, D.W., Weeraratne, D.S. and Nishida, K. (2014), Estimation of azimuthal anisotropy in the NW Pacific from seismic ambient noise in seafloor records, Geophys. J. Int., 199 (1): 11-22. doi: 10.1093/gji/ggu240

Apr, 2014

New web site is opened.