A5077445953- Seismic Waves and Analysis
- Seismic Imaging and Inversion Techniques
- Astrophysics and Cosmic Phenomena
- Geophysics and Sensor Technology
- Solar and Space Plasma Dynamics
- Underwater Acoustics Research
- Methane Hydrates and Related Phenomena
- Particle Dynamics in Fluid Flows
- Shape Memory Alloy Transformations
- Ocean Waves and Remote Sensing
- Scientific Research and Discoveries
- Atmospheric Ozone and Climate
- Geophysics and Gravity Measurements
- Geophysical Methods and Applications
- Seismology and Earthquake Studies
- Spacecraft and Cryogenic Technologies
- Nuclear Physics and Applications
- Aeolian processes and effects
Tohoku University
2024-2025
The University of Tokyo
2022-2024
Association for the Development of Earthquake Prediction
2024
Hokkaido University
2016-2019
Abstract The 2024 Noto-Hanto earthquake with a magnitude of 7.6 occurred in the Noto Peninsula on January 1, 2024. mainshock had reverse fault focal solution and direction compression axis was northwest–southeast. In Peninsula, swarms have been observed since December 2020. contrast to this swarm activity, extending marine area. Therefore, we performed rapid response seafloor seismic observation source region its vicinity. We deployed 34 free-fall pop-up type ocean bottom seismometers (OBSs)...
Abstract The S-wave velocity ( V s) structure of sediments and the uppermost crust in landward slope a subduction zone are important for determining dynamics overriding plate. Although distributed acoustic sensing (DAS) measurements have improved horizontal resolution s marine areas, estimations been limited to sedimentary layers. In present study, we applied seismic interferometry DAS data 13 h duration image crustal offshore Sanriku, Japan with spatial 2.5 km > 3.0 depth. We grouped...
SUMMARY In distributed acoustic sensing (DAS), optical fibre is used as sensors, which enables us to observe strain over tens of kilometres at intervals several metres. S-wave velocity (Vs) structures shallow sediments high resolution have been obtained from surface wave dispersion curves by applying seismic interferometry DAS data both onshore and offshore. However, it known that there a disadvantage interferometry. addition Rayleigh waves, Love waves are also included. Consequently, the...
<title>Abstract</title> P-wave velocity (Vp) structures in marine areas have been estimated using controlled-source seismic surveys and refraction methods. The spatial resolution of Vp depends on the number receivers shots. In environments, is often limited due to sparse distribution ocean bottom seismometers (OBSs). Recently, use distributed acoustic sensing (DAS) has enabled high-resolution strain measurements over long distances, with station density along DAS cables being much higher...
NiTi shape memory alloys exhibit both effect and superelasticity. In general, the capacity of commercial products supplied as drawing wires is known to be limited below 7% strain. order get a larger strain than that, additional cold working through with dices medium temperature annealing were applied. It might cause work hardening re-orientation grains into favorable <111> direction along tensile axis. As result, we obtained superelastic strains about 9%.
Abstract S-wave velocity ( V s) structures of sediments and the uppermost crust in landward slope a subduction zone are essential for elucidating dynamics overriding plate. Although distributed acoustic sensing (DAS) measurements have improved horizontal resolution s structure marine areas, estimation has been limited upper sedimental layer. This study imaged from shallow to deep at depth up 7 km off Sanriku, Japan, with high lateral 2.5km, by applying seismic interferometry DAS data 13...