News

I visited Noto Peninsula in central Japan, where M7.6 earthquake occurred on 1 Jan 2024. I saw the great uplift on the western coast and surface rupture in the eastern area.

I participated in the 2024 Seismological Society of Japan (SSJ) Fall Meeting , held at the Toki Messe in Niigata City, JP, from Oct. 21 to 23. I made a following oral presentation.

• S22-03 “Fault Geometries of the 2024 Mw 7.5 Noto Peninsula Earthquake from Hypocenter-Based Hierarchical Clustering” Sawaki et al.

We imaged the slab and crustal structure of the Kii Peninsula in the Nankai subduction zone in SW Japan using a receiver-function-like analysis. Positive impedance contrasts in the forearc crust correspond to the top surface or inside Kumano pluton, which may control fluid conditions around slow-earthquake sources.

Check it out below!

• Sawaki, Y., Y. Ito, E. S. M. Garcia, A. Miyakawa, and T. Shibutani (2024). Deep plutonic bodies over low-frequency earthquakes revealed from receiver-side Green’s functions. Tectonophysics, 892, 230536. doi: 10.1016/j.tecto.2024.230536 (Open Access)

I participated in the Japan Geoscience Union (JpGU) Meeting 2024 , held at the Makuhari Messe in Chiba, JP, from May 26 to 31. I made two presentations: one for oral and the other for poster.

• [SCG50-02] Multiscale Fault Estimation in California and Oklahoma. Sawaki, Y., D. Shelly, T. Uchide, K. Sagae, T. Shiina, Y. Sato, and H. Horikawa
• [U15-P09] Fault geometries of the 2024 Noto Peninsula earthquake estimated by hypocenter clustering. Sawaki, Y., T. Uchide, T. Shiina, K. Sagae, H. Horikawa, and K. Imanishi

We have a new preprint on the seismic structure beneath the Kii Peninsula, southwestern Japan, available on SSRN. While it’s not yet peer-reviewed, feel free to check it out if you’re interested!

Sawaki, Y., Y. Ito, E. S. M. Garcia, A. Miyakawa, and T. Shibutani. Deep Plutonic Bodies Over Low-Frequency Earthquakes Revealed from Receiver-Side Green’s Functions. Available at SSRN: http://dx.doi.org/10.2139/ssrn.4793654

SF-A03 Group Workshop at Toyama was held from Feb. 08–10, 2024. I gave a talk about “Hypocenter-based Visualization of Multiscale Earthquake Faults”.

The presentations on geology related to the mechanism of tectonic tremors were interesting to me. As a research collaborator of group A03, I would like to contribute to the comparative subduction zone studies of Slow-to-Fast earthquakes!

Happy New Year! I hope you all have a great year!

I participated in the AGU Fall Meeting 2023 held at San Francisco during December 11–15. We had a good poster presentation with lively discussions with worldwide researchers. I can’t wait the next opportunity to interact with you all!

I visited the United States Geological Survey in Golden, CO for a month and conducted collaborative studies with Dr. David Shelly. It was a fantastic stay and a good opportunity to proceed my research.

I’m going to San Francisco for the upcoming meeting of American Geophysical Union. I have a poster presentation related to my current study .

Our new paper is publishded! We analyzed shear wave splitting from receiver functions in Shikoku Island, SW Japan, and along-dip variation of fast axes is clarified. Check it out!

Ruan, Yihuan, Yoshihiro Ito, and Yasunori Sawaki, (2023). Anisotropic Velocity Structure Beneath Shikoku, Japan: Insights From Receiver Function and Shear Wave Splitting Analyses Journal of Geophysical Research: Solid Earth, 128, e2023JB027178. doi: 10.1029/2023JB027178