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Earth's Interior Electromagnetism Lab (Toh, World Data Center for Geomagnetism)
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The lab approaches the mechanisms of earthquakes and volcanoes through geomagnetism and electricity underground.
AboutAbout the lab
Looking inside the Earth through how easily electricity flows underground.
The lab centers on research that investigates the electrical conductivity of Earth's interior from the electromagnetic induction that changes in the magnetic field cause inside the Earth, and it also studies regional electrical conductivity anomalies, aiming for applications to resource development and to the prediction and forecasting of earthquakes and volcanic eruptions.
The research is carried out at the Disaster Prevention Research Institute, the Institute for Geothermal Sciences (Aso) attached to the Graduate School of Science, and the World Data Center for Geomagnetism.
The Crustal Fluids Research Division of the Volcano Disaster Research Center at the Disaster Prevention Research Institute is involved as a unit of this lab, and the master's program admits students through the "Space and Earth Electromagnetism Group" of divisions.
Key terms
- electrical conductivity
- How easily a material conducts electricity. It changes when there is water or magma underground
- self-potential
- Natural differences in electric potential that arise in the ground, for example from the flow of groundwater
- magnetotellurics
- A method for investigating underground electrical conductivity by simultaneously measuring Earth's magnetic field and telluric currents
ResearchResearch themes
The lab mainly conducts observational research in three areas: temporal changes in Earth's magnetic field, self-potential, and electrical conductivity anomalies.
*Illustrative imageCrustal activity and changes in the magnetic field
The lab conducts observational studies of stress-induced magnetic fields and thermomagnetic effects related to crustal activity such as earthquakes and volcanic eruptions, and investigates the mechanisms by which strain and heat build up and decline.
*Illustrative imageSelf-potential, groundwater, and hydrothermal fluids
In addition to observing self-potential at active volcanoes and active fault zones, the lab applies the electrical structure and hydraulic conductivity of the ground, obtained by electrical and electromagnetic surveys, to streaming potential theory, and examines the flow of groundwater and hydrothermal fluids.
*Illustrative imageElectrical conductivity anomalies and crustal structure
Mainly using the magnetotelluric method, the lab observes structures related to tectonics from the upper mantle to the crust, and investigates the relationship between the deep structure of active faults and inland earthquakes, and between the deep structure of the mantle and volcanic activity.
MembersFaculty
- ProfessorRyokei Yoshimura
- Associate ProfessorHiroaki Toh
- Associate ProfessorKenichi Yamazaki
- Associate ProfessorMitsuru Utsugi
- Assistant ProfessorMaki Hata
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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: “"The Natural Wonder of the South- Taal Volcano"” Robertmarrel / CC BY-SA 4.0 (cropped)
- Crustal activity and changes in the magnetic field: “Mt.Aso crater” Takasunrise0921 / CC BY 2.5 (cropped)
- Self-potential, groundwater, and hydrothermal fluids: “Bubble of mud volcano” Andrzej Solecki / CC BY 4.0 (cropped)
- Electrical conductivity anomalies and crustal structure: “Earth crust i” USGS and me / CC0 (cropped)
- Related lab (Volcano Physics Lab): “Mount Aso views ( )” Raita Futo from Tokyo, Japan / CC BY 2.0 (cropped)
- Related lab (Geothermal Sciences (Ishii) Lab): “Japan Kyushu, Beppu hot spring 05” Marie-Sophie Mejan / CC BY 4.0 (cropped)
- Related lab (Terrestrial Electromagnetism Lab): “039 Northern lights over Mývatn (Iceland) Photo by Giles Laurent” Giles Laurent / CC BY-SA 4.0 (cropped)
- Related lab (Seismology Lab): “Historischer Seismograph” Ilyacadiz / CC BY-SA 4.0 (cropped)
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