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Ominato Lab (Observation Development Research Center)
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The lab investigates what is happening inside volcanoes by studying the earthquakes and tremor that occur at them.
AboutAbout the lab
Decoding the motion inside volcanoes from their shaking
The Ominato Lab studies volcano physics.
At volcanoes, magma and hydrothermal activity produce volcanic earthquakes and tremor that are far more diverse than ordinary earthquakes.
This diversity is thought to reflect complex physical phenomena inside volcanoes, and the lab analyzes observed seismic waveforms to understand what is happening inside active volcanoes.
Key terms
- Volcanic earthquake
- An earthquake that occurs at or around a volcano in connection with the movement of magma or hydrothermal fluids
- Tremor
- A phenomenon in which small vibrations continue for a long time without a clear onset. At volcanoes, it is caused by the movement of magma or other fluids
- Volcanic conduit
- The pathway through which magma underground rises to the crater at the surface
ResearchResearch themes
To understand the physical phenomena occurring inside active volcanoes, the lab analyzes broadband seismic waveforms observed around volcanoes and compares them with observations such as crustal deformation, gravity, and volcanic ejecta. It also aims to establish a source model that can be applied broadly to volcanic earthquakes.
*Illustrative imageUnraveling the waveforms of volcanic earthquakes
The lab analyzes broadband seismic waveforms observed around volcanoes and compares the results with observations such as crustal deformation, gravity, and volcanic ejecta. Using analysis methods that can remove the effects of a volcano's complex topography and heterogeneous structure, the lab extracts information about the source from complex waveforms.
*Illustrative imageSource models for volcanic earthquakes
Volcanic earthquakes and tremor are thought to be caused by vibrations of the conduit extending deep underground from the crater, or of fluid-filled cracks, but no well-established source model exists yet. The lab develops analysis methods for spatially extended sources and aims to establish a source model that can be applied broadly to volcanic earthquakes.
*Illustrative imageObservations near the crater
The lab places seismometers around craters close to the source and observes the earthquakes that accompany volcanic activity. To learn about the internal structure of volcanoes, it also conducts observations and analyses using artificial seismic sources and natural earthquakes.
MembersFaculty
- ProfessorTakao Ominato
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: “150501 Shōwa Iwojima & Satsuma Iwojima” 名古屋太郎 / CC BY-SA 4.0 (cropped)
- Unraveling the waveforms of volcanic earthquakes: “Harmonic-tremor” USGS / Public domain (cropped)
- Source models for volcanic earthquakes: “Fogo-Volcano monitoring (1)” Ji-Elle / CC BY-SA 3.0 (cropped)
- Observations near the crater: “Taal Volcano Remote Monitoring Station” Ervin Malicdem / CC BY-SA 4.0 (cropped)
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