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Nishida Lab
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A lab that explores the Earth's interior through the planet's vibrations that are not caused by earthquakes.
AboutAbout the lab
Noise to others, a treasure trove to me.
The Nishida Lab studies the vibrations of the Earth that continue even when no earthquakes are occurring.
By carefully analyzing records from many seismometers, barometers, and water pressure gauges, the lab searches for new vibration phenomena hidden in records that were previously dismissed as noise.
The lab investigates how ocean waves and the atmosphere shake the Earth, treating the atmosphere, oceans, and solid Earth as one large integrated system.
The lab also uses these vibrations to study the structure of the Earth's interior and how it changes over time.
Key terms
- Microseism
- Small ground vibrations caused by ocean waves pounding the seafloor. They are a major source of noise in earthquake observation.
- Earth's background free oscillations
- A phenomenon in which the entire Earth keeps vibrating slowly at long periods even when no earthquakes are occurring.
- Seismic interferometry
- A method of investigating the structure of the Earth's interior by using how vibrations that constantly arrive from various directions propagate.
NewsLab news
View More ↗ResearchResearch themes
The lab analyzes large volumes of data from seismometers, barometers, water pressure gauges, and other instruments to discover new vibration phenomena in records that were thought to be noise, and aims to uncover the mysteries behind them. The lab has two themes: the mechanisms of Earth's vibrations caused by sources other than earthquakes, and the use of those vibrations to estimate the structure of the Earth's interior and its changes over time.
*Illustrative imageMicroseisms Generated by Ocean Waves
The lab studies seismic waves called microseisms, which are produced as ocean waves continuously shake the solid Earth. They are clearly observed when a typhoon passes, and can also be detected in the middle of continents far from the sea.
*Illustrative imageThe Earth's Continuous Vibration as a Whole
Even during quiet periods without earthquakes, the entire Earth keeps vibrating at long periods of several hundred seconds (known as Earth's background free oscillations). It has become clear that ocean waves are involved in addition to atmospheric disturbances, but there is still much about the mechanism that is not understood.
*Illustrative imageProbing the Earth with Seismic Waves Generated by Storms
The lab detected P waves and S waves generated by ocean waves from an explosive cyclone (bomb cyclone) in the Atlantic Ocean, using records from seismometers in Japan. Seismic waves from storms may make it possible to investigate the Earth's interior beneath the ocean, where there are neither earthquakes nor observation stations.
*Illustrative imageCapturing Time Changes in the Earth's Interior
Seismic interferometry makes it possible to investigate the Earth's interior without waiting for earthquakes, so continuously observing vibrations allows changes in internal structure over time to be tracked. The lab aims to detect changes in seismic wave velocity associated with volcanic eruptions and earthquakes, and to clarify the mechanisms behind them.
MembersFaculty
- ProfessorKiwamu NishidaPublications ↗
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Write a lab reviewAnonymous · Your draft is saved if you stopRelatedLabs similar to Nishida Lab
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Takeuchi LabFaculty of Science, Department of Earth and Planetary PhysicsSeismology (seismic tomography, deep Earth structure)The information on this page is compiled by the LabLog team from the lab's public information and interviews. For corrections or removal requests, please contact LabLog, not the lab.
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: “Spring storm on the West Wales coast” Matt Herod / Martin Wolstencroft / CC BY-SA 4.0 (cropped)
- Microseisms Generated by Ocean Waves: “Super Typhoon Songda 2004” Jacques Descloitres, MODIS Rapid Response Team, NASA/GSFC / Public domain (cropped)
- The Earth's Continuous Vibration as a Whole: “The Earth seen from Apollo 17” NASA / Apollo 17 crew / Public domain (cropped)
- Probing the Earth with Seismic Waves Generated by Storms: “October 2021 Northeast Pacific bomb cyclone 3 on” NASA / Public domain (cropped)
- Capturing Time Changes in the Earth's Interior: “Mt.Asama (From saku city)” Yu.nakai / CC BY-SA 3.0 (cropped)
- Related lab (Kawai Lab): “Seismogram at Weston Observatory” Z22 / CC BY-SA 3.0 (cropped)
- Related lab (Isse Lab): “Pacific Ocean laea relief location map” Uwe Dedering / 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 (Takeuchi Lab): “Terrestrial Planet Interiors (Earth, Mars and Moon) - Artist's Concept” NASA/JPL-Caltech / Public domain (cropped)
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