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Takeuchi Lab
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The lab studies the Earth's interior from seismic waves using new analysis methods.
AboutAbout the lab
Creating a new window into the Earth's interior.
The Takeuchi Lab is a global seismology lab that investigates the Earth's internal structure using seismic waves that travel through the entire planet.
The lab develops new analysis methods to extract from seismic waves types of information that could not be obtained before, with the goal of broadening the framework of seismology.
While using supercomputers to secure a large volume of data, the lab places importance on analysis based on close observation of the waveform data itself.
Key terms
- Synthetic waveform
- The shaking that a seismometer should record, calculated by assuming a particular structure of the Earth
- Tomography
- A method that uses many seismic wave records to map in three dimensions where waves travel faster or slower inside the Earth
- Asthenosphere
- The soft, easily flowing layer of the mantle beneath the plates
ResearchResearch themes
The lab estimates the Earth's internal structure using how seismic waves propagate at the global scale. By developing new analysis methods, it creates new windows into the Earth and seeks clues about the materials and dynamics of its interior.
*Illustrative imageEfficient computation of synthetic waveforms
The lab efficiently computes synthetic waveforms for a three-dimensional, heterogeneous Earth, and also extracts information from later-arriving waves that have not been used before. Using tomography that compares synthetic waveforms directly with observed waveforms, it estimates the structure of the entire mantle.
*Illustrative imageAnalysis of scattered seismic waves
This research treats the effects of fine-scale heterogeneities that even tomography cannot resolve as statistical scattering, making it possible to simulate how short-period seismic waves propagate.
*Illustrative imageTravel-time and amplitude measurement and array analysis
When multiple waves arrive overlapping, it becomes difficult to measure their arrival times and amplitudes. The lab makes such measurements possible through waveform matching, and estimates fine-scale structure from array data recorded by densely deployed seismometers.
*Illustrative imageStructure of the oceanic mantle
Using records from ocean-bottom seismometers and the analysis methods it has developed, the lab studies the upper mantle (lithosphere and asthenosphere) beneath the oceans, where there are almost no observation stations, and aims to understand how the asthenosphere forms.
MembersFaculty
- ProfessorNozomu TakeuchiPublications ↗
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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: “Terrestrial Planet Interiors (Earth, Mars and Moon) - Artist's Concept” NASA/JPL-Caltech / Public domain (cropped)
- Efficient computation of synthetic waveforms: “Japan earthquake ( )” P K / CC BY 2.0 (cropped)
- Analysis of scattered seismic waves: “Iceland magnitude 5.2 earthquake (2 01 AM, 7 March )” James St. John / CC BY 2.0 (cropped)
- Travel-time and amplitude measurement and array analysis: “Cascadia Array” M. Pazos & R. Lumpkin / Public domain (cropped)
- Structure of the oceanic mantle: “Ocean bottom seismometers onboard the RV Elisabeth Mann-Borghese” Simon Stähler / 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 (Tanaka Lab): “AsamaYamaS” Beh / CC BY-SA 3.0 (cropped)
- Related lab (Shinohara Lab (Marine Seismology Group / Seafloor Seismic and Crustal Deformation Observation)): “Ocean Bottom Seismometer made by ERI, U-Tokyo” Theodore Xu / CC BY-SA 4.0 (cropped)
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