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Isse Lab
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A lab that uses seafloor seismometers to study oceanic plates and the Earth's interior.
AboutAbout the lab
Seeing the Earth's interior from the seafloor.
The Isse Lab studies the structure of the Earth's interior through seismic observations on the seafloor.
Oceanic plates are born at mid-ocean ridges and subduct at trenches, but reconciling theory with the actual Earth is still a work in progress.
Using broadband ocean-bottom seismometers developed at the Earthquake Research Institute, the lab conducts observations in collaboration with researchers in Japan and abroad.
From the records obtained, the lab aims to reveal the structure of oceanic plates and the deep Earth.
Key terms
- broadband ocean-bottom seismometer
- A seismometer placed on the seafloor that can record a wide range of motion, from slow to fast shaking
- oceanic plate
- A plate of rock that forms the seafloor. It is born at a mid-ocean ridge, thickens as it cools, and subducts at a trench
- surface wave
- A seismic wave that travels near the Earth's surface. The structure underground can be determined from how its speed differs by period
NewsLab news
View More ↗ResearchResearch themes
Through seafloor observations with broadband ocean-bottom seismometers, the lab aims to clarify how seismic waves propagate (that is, the structure) through oceanic plates and the Earth's interior. By analyzing the observational records with surface-wave methods, the lab is uncovering the structure of oceanic plates.
*Illustrative imagePacific Array Project
An international effort to deploy seismometers at various locations on the Pacific seafloor and build a large observation network covering the entire Pacific. The lab conducts observations jointly with partners in South Korea, Taiwan, and Germany.
*Illustrative imageStructure beneath the Ontong Java Plateau
The lab has shown that beneath the Ontong Java Plateau, a huge oceanic plateau in the southwest Pacific, the base of the plate is deeper than in the surrounding area.
*Illustrative imageStructure of the Pacific Upper Mantle
The lab analyzed the structure of the Pacific upper mantle while taking into account a growth model in which plates cool and thicken, and identified anomalous regions that deviate from that model.
*Illustrative imageStructure of the Deep Earth
Seafloor observation records also include seismic waves that traveled through the deep Earth. The lab also aims to use them to reveal the structure of the deep Earth.
MembersFaculty
- Associate ProfessorTakehi IssePublications ↗
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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: “Pacific Ocean laea relief location map” Uwe Dedering / CC BY-SA 3.0 (cropped)
- Pacific Array Project: “Campagne MAYOBS15 - Mise à l'eau d'un sismomètre OBS (Ifremer )” Ifremer / CC BY 4.0 (cropped)
- Structure beneath the Ontong Java Plateau: “Coral Sea Topography” ChaseKiwi / CC0 (cropped)
- Structure of the Pacific Upper Mantle: “Earth's seafloor age” Fabio Crameri / CC BY-SA 4.0 (cropped)
- Structure of the Deep Earth: “Earth Interior Structure Blank” Volcan26 / CC BY-SA 4.0 (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 (Nishida Lab): “Spring storm on the West Wales coast” Matt Herod / Martin Wolstencroft / CC BY-SA 4.0 (cropped)
- Related lab (Baba Lab (Ocean Hemisphere Research Center)): “Ocean Bathymetry (NESDIS Bathymetry)” NOAA / Public domain (cropped)
- Related lab (Kawai Lab): “Seismogram at Weston Observatory” Z22 / CC BY-SA 3.0 (cropped)
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