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Applied Geophysics Lab
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The lab looks into the subsurface and measures what cannot be seen.
AboutAbout the lab
Peer underground; measure what cannot be seen.
The Applied Geophysics Lab studies techniques for investigating the subsurface, as well as the properties of faults and rocks.
Techniques for imaging the subsurface are essential for resource development, the use of underground space, and the conservation of the global environment.
The lab develops geophysical exploration techniques that use elastic waves and electromagnetic waves to investigate the subsurface remotely without damaging it.
It also studies fault friction, which is important for understanding the subsurface, through experiments and numerical computation.
Key terms
- Geophysical exploration
- Methods for investigating the subsurface without digging, using seismic waves, electromagnetic waves, and the like
- Full-waveform inversion
- A method that uses the entire shape of observed seismic waves to computationally trace back to the subsurface structure that produced them
- Rate- and state-dependent friction law
- An equation describing how frictional strength changes with sliding speed and the state of the sliding surface
ResearchResearch themes
The lab develops geophysical exploration techniques that use elastic waves and electromagnetic waves to investigate the subsurface remotely without damaging it, and conducts experimental and numerical studies of fault friction, which is important for understanding subsurface conditions. It collaborates with many fields, including geology and seismology.
*Illustrative imageCan Underground Excavation Move Faults?
Faults are sometimes located near tunnels excavated to extract resources. From the stress state of the ground before excavation and how excavation disturbs it, the lab calculates the forces acting on the fault plane and examines whether the fault could slip again.
*Illustrative imageMeasuring the Friction of Rock
Whether a fracture in a rock mass slips slowly and stably or suddenly depends on the frictional properties of the fracture. The lab measures the parameters of the rate- and state-dependent friction law in actual rock masses and evaluates their stability against slip.
*Illustrative imageHow Slip Propagates
How fault slip propagates is governed by the properties of the rupture tip. Using strain data obtained from large-scale rock friction experiments, the lab investigates the properties of the rupture tip and explores the possibility of determining friction values that are difficult to measure.
*Illustrative imageImaging the Subsurface More Accurately
Accurate visualization of the subsurface is essential for monitoring carbon dioxide injected underground and for exploring oil, natural gas, and geothermal resources. The lab develops noise-robust full-waveform inversion methods that incorporate new data processing.
MembersFaculty
The members of the Applied Geophysics Lab consist of faculty members, secretaries, researchers, and doctoral, master's, and undergraduate students.As of 2026
- ProfessorEiichi Fukuyama
- Associate ProfessorJunichi Takekawa
- Assistant ProfessorNana Yoshimitsu
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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: “Seismic Survey Party” Wsx2 / CC BY-SA 3.0 (cropped)
- Can Underground Excavation Move Faults?: “Drilling rig and a digger at a construction site in Tuntorp” W.carter / CC BY 4.0 (cropped)
- Measuring the Friction of Rock: “Rock sample Adigrat sst Kalazban” Jan Nyssen / CC BY-SA 4.0 (cropped)
- How Slip Propagates: “Strike-Slip Fault” Hiral jain 1 / CC BY 4.0 (cropped)
- Imaging the Subsurface More Accurately: “Seismic from an unconformity” Geophysicus / CC BY-SA 4.0 (cropped)
- Related lab (Crustal Development Engineering Lab): “Hohlbohrkern” --Nightflyer 23:51, 27. Jun 2006 (CEST) / CC BY-SA 3.0 (cropped)
- Related lab (Crustal Environment Engineering Lab): “Satellite Image, Pearl River Bridge 19660823” CIA/NRO/USGS / Public domain (cropped)
- Related lab (Geofront Systems Engineering Lab): “Blue Spring Cavern Underground River Tour” Jim Vajda / CC BY 2.0 (cropped)
- Related lab (Environmental Design Engineering Lab): “Deer Island Waste Water Treatment Plant from lookout” 4300streetcar / CC BY 4.0 (cropped)
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