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Hattori Lab
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A lab that detects electromagnetic changes preceding earthquakes, with the aim of monitoring crustal activity.
AboutAbout the lab
Watching for earthquakes through electromagnetic changes.
The Hattori Lab studies electromagnetic phenomena that appear before crustal activity such as earthquakes and volcanic activity.
Anomalies in geoelectric potential difference, the geomagnetic field, and the propagation of VLF-band radio waves have been reported to be observed in many parts of the world.
The lab aims to clarify the mechanisms behind these phenomena and to realize a system for monitoring crustal activity, a kind of "crustal weather forecast."
To that end, the lab also measures the electromagnetic structure of the subsurface and researches how to remove electromagnetic noise from trains and factories.
Key terms
- Geoelectric potential difference
- The voltage difference that arises between two electrodes placed in the ground. It changes depending on subsurface conditions.
- Magnetotelluric (MT) method
- A survey method that uses naturally occurring electromagnetic fields to investigate how easily electricity flows through different parts of the subsurface.
- Crustal weather forecast
- The idea of monitoring the state of crustal activity day by day and reporting on it, much like a weather forecast.
ResearchResearch themes
The lab observes electromagnetic phenomena that appear before crustal activity such as earthquakes and volcanic activity, and works to clarify the mechanisms by which they occur. Its goal is to monitor crustal activity through electromagnetic approaches and use the results for disaster mitigation.
*Illustrative imageMonitoring crustal activity with electromagnetics
The lab views an earthquake as a fracture phenomenon caused by stress concentrating within the crust. It aims to accurately capture the electromagnetic phenomena that appear during the preparation process and to clarify the physical mechanisms behind them.
*Illustrative imageEstimating the electrical structure of the subsurface
The lab conducts electromagnetic surveys such as the MT method to estimate the electrical structure of the subsurface. It compares this distribution with crustal activity to examine how it relates to the locations where activity occurs.
*Illustrative imageDetecting anomalous signals and removing noise
The lab develops methods to separate observed time-series signals and effectively extract information about the signal of interest, as well as methods to identify the source of a signal.
MembersFaculty
- ProfessorKatsumi Hattori
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: “Floating core fluxgate inclinometer compass autonnic” User Mike1024 / Public domain (cropped)
- Monitoring crustal activity with electromagnetics: “Kamishiro fault earthquake 7” Apple2000 / CC BY-SA 4.0 (cropped)
- Estimating the electrical structure of the subsurface: “Geophysical survey, Long Meg ^ Her Daughters - geograph.org.uk - 3379792” Andrew Curtis / CC BY-SA 2.0 (cropped)
- Detecting anomalous signals and removing noise: “Digital Oscilloscope” Mikasa2025 / CC BY 4.0 (cropped)
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（佐藤 利典） ): “Plongée en bassin d'essais pour le test des sismomètres OBS (Ocean Bottom Seismometer) (Ifremer )” Olivier Dugornay (Ifremer) / CC BY 4.0 (cropped) - Related lab (岩石・鉱物学教育研究分野): “Thin section scan crossed polarizers Siilinjärvi H10” kallerna / CC BY-SA 4.0 (cropped)
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（竹内 望） ): “Watermelon Snow - King George Island” Tsy1980 / CC BY-SA 4.0 (cropped)
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