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Geophysics (Sato) Lab
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A lab that investigates why earthquakes occur through observations on the seafloor.
AboutAbout the lab
From the ocean floor, closer to how earthquakes work.
Prof. Sato's lab conducts research to understand why earthquakes occur.
Around Japan, large earthquakes often occur at boundaries where plates subduct beneath the sea.
Using artificial seismic sources and ocean bottom seismometers, the lab investigates the shape in which plates subduct and which locations are most prone to earthquakes.
To understand the process by which earthquakes occur repeatedly, the lab is also developing methods for estimating fault slip and simulation models.
Key terms
- Plate boundary
- A place where the rigid plates covering Earth's surface meet. Large earthquakes tend to occur there
- Ocean bottom seismometer
- An instrument placed on the seafloor to record earthquake shaking. It is lowered into the sea from a ship and recovered later
- Afterslip
- The phenomenon in which a fault continues to slip slowly after a large earthquake
ResearchResearch themes
The lab aims to clarify why earthquakes occur using geophysical methods. Centered on offshore observations, it combines surveys of crustal structure, observation of seismic activity, and simulation.
*Illustrative imageSlip After Great Earthquakes
The lab developed a method to determine when, where, and how much a fault slipped during afterslip, the slow slip that follows a great earthquake, while taking into account the properties of the rocks underground.
*Illustrative imageKanto Asperity Project
To understand the earthquakes that recur in southern Kanto, the lab takes part in promoting the Kanto Asperity Project, which proposes drilling by a deep-sea drilling vessel. Ahead of the drilling, observations using ocean bottom pressure gauges have begun.
*Illustrative imageHydrothermal Activity and Subsurface Structure at Mid-Ocean Ridges
At mid-ocean ridges, where plates are born, the lab investigated how hydrothermal activity relates to subsurface structure, and showed that the way hydrothermal systems form differs from place to place.
*Illustrative imageInvestigating Subducting Plate Boundaries
Using artificial seismic sources and ocean bottom seismometers, the lab investigates the structure of the crust and upper mantle at subducting plate boundaries, as well as the seismic activity occurring there.
MembersFaculty
- ProfessorToshinori Sato
VoicesStudent voices
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Report an errorAbout the images
The top and research theme images are illustrative and were not taken at the lab. They are cropped from Wikimedia Commons images. Cropped CC BY-SA images are provided under the same CC BY-SA license as the original (version shown on each line).
- Top image: “Plongée en bassin d'essais pour le test des sismomètres OBS (Ocean Bottom Seismometer) (Ifremer )” Olivier Dugornay (Ifremer) / CC BY 4.0 (cropped)
- Slip After Great Earthquakes: “July 5, 2019, Ridgecrest earthquake road offset” Ken Hudnut / Public domain (cropped)
- Kanto Asperity Project: “Chikyu 1” Gleam / CC BY-SA 3.0 (cropped)
- Hydrothermal Activity and Subsurface Structure at Mid-Ocean Ridges: “Fumeur actif du site hydrothermal Lucky Strike (Ifremer )” null / CC BY 4.0 (cropped)
- Investigating Subducting Plate Boundaries: “Subduction zone - 2ategories” As6022014 / CC BY 3.0 (cropped)
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