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Ide Lab
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A lab that uncovers the diverse properties of earthquakes, from large earthquakes to slow earthquakes.
AboutAbout the lab
Toward a unified understanding of diverse earthquakes
Ide Lab studies the mechanisms of earthquakes as a physical phenomenon.
The lab clarifies the diverse properties of earthquakes, from large to small and from fast to slow.
It aims to explain the complexity and diversity of earthquakes with physical laws that are as simple and realistic as possible, and to improve future predictions.
Key terms
- Fault slip inversion
- An analysis method that works backward to determine where and how much a fault slipped, so as to simultaneously explain earthquake records from many observation stations
- Hierarchy
- A nested property in which small ruptures successively trigger ruptures at larger scales, growing into a giant earthquake
- Slow earthquakes
- Phenomena in which a fault slips much more slowly than in ordinary earthquakes, including tectonic tremor and slow slip events
ResearchResearch themes
Both giant and small earthquakes are, in essence, the same phenomenon: slip accompanied by rupture on underground faults, and the propagation of seismic waves. The lab aims to explain the complexity and diversity of earthquakes with simple, realistic physical laws and to improve their predictability.
*Illustrative imageDetailed analysis of the rupture and slip of complex earthquakes
The lab develops and improves fault slip inversion, a method that estimates the distribution of slip on a fault from earthquake data recorded at many observation stations. From large earthquakes such as the Tohoku-Oki earthquake to micro-earthquakes in mines, it uses the details of rupture and slip to examine the physical conditions at the source.
*Illustrative imageModels of earthquake hierarchy
Real fault planes have irregularities of many different sizes. An earthquake starts from a small irregularity and grows into a large earthquake by breaking larger irregularities one after another. The lab develops theoretical and numerical methods to understand this hierarchical structure, and also evaluates the limits of predictability imposed by randomness.
*Illustrative imageA unified understanding of fast earthquakes and slow earthquakes
In western Japan, phenomena of different sizes, such as tectonic tremor, low-frequency earthquakes, and slow slip events, occur at almost the same time and in the same place. The lab regards these as slow earthquakes that share a common mechanism, and aims to reach a comprehensive understanding that includes ordinary earthquakes through observation, data analysis, and simulation.
MembersFaculty
The members of Ide Lab consist of faculty, visiting researchers, a secretary, and doctoral and master's students.As of 2026
- ProfessorSatoshi IdePublications ↗
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: “Fairview Fault mirror at Dixie Valley Nevada” Christierowe / CC BY-SA 4.0 (cropped)
- Detailed analysis of the rupture and slip of complex earthquakes: “Seismogram on historical seismometer at Institute of Geophysis of the Czech Academy of Science (12)” Petr Brož (Czech Academy of Science) / CC BY-SA 4.0 (cropped)
- Models of earthquake hierarchy: “Slickenside - Corona Heights, San Francisco” Dextersinister / CC BY-SA 4.0 (cropped)
- A unified understanding of fast earthquakes and slow earthquakes: “Nankai trough topographic” Peka / CC BY-SA 3.0 (cropped)
- Related lab (Mochizuki Lab (Marine Seismology)): “Test des sismomètres OBS (Ocean Bottom Seismometer) en bassin d'essais (Ifremer )” Olivier Dugornay (Ifremer) / CC BY 4.0 (cropped)
- Related lab (Araya Lab): “Interferenz-michelson” FL0 / CC BY-SA 3.0 (cropped)
- Related lab (Watada Lab (Earth and Planetary Dynamics)): “SWOT Satellite Measures Pacific Tsunami (PIA26652)” NASA/JPL-Caltech / Public domain (cropped)
- Related lab (Masumoto Lab): “Timor Sea (MODIS )” MODIS Land Rapid Response Team, NASA GSFC / Public domain (cropped)
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