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Park Lab (Marine Geology and Geophysics)
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The lab looks beneath the seafloor to explore how giant earthquakes and tsunamis occur.
AboutAbout the lab
Approaching giant earthquakes and tsunamis through the structure beneath the seafloor
The Park Lab studies how giant earthquakes and tsunamis occur in ocean trenches, based on the structure and properties of the subseafloor.
Using seismic reflection data and deep-sea drilling data, the lab maps the subsurface structure in fine detail and estimates the movement of subsurface water (fluids).
The main study area is the Nankai Trough in southwestern Japan, where giant earthquakes and tsunamis have occurred repeatedly.
Students who wish to join the lab enter the Department of Earth and Planetary Science, Graduate School of Science.
Key terms
- Seismic reflection survey
- A method that captures artificially generated sound waves reflected back from subsurface layers to image the structure of the subsurface.
- Nankai Trough
- A deep trench off southwestern Japan where the oceanic plate subducts beneath the land. Giant earthquakes have occurred there repeatedly.
- Porosity
- The proportion of a stratum occupied by the spaces between grains. The spaces contain water and other fluids.
NewsLab news
View More ↗ResearchResearch themes
The lab aims to clarify the subsurface structure and properties that determine how megathrust earthquakes and tsunamis occur at ocean trenches. Using seismic reflection data and deep-sea drilling data, it images the subsurface structure with high precision and estimates the movement of water.
*Illustrative imageImaging the Subsurface with 3D Seismic Surveys
Using 3D seismic reflection data acquired in the Nankai Trough off Kumano on the Kii Peninsula, the lab imaged the 3D structure of a giant earthquake fault. Near the fault, a layer in which seismic waves travel slowly extends widely. This layer is thought to be rich in water and may promote tsunami generation.
*Illustrative imageCombined Analysis of Seismic Surveys and Drilling
By combining 3D seismic reflection data with drilling data from the International Ocean Discovery Program (IODP), the lab estimates the porosity of strata in the Nankai Trough off Kumano over a wide area.
*Illustrative imageFaults That Cause Tsunami Earthquakes
In the Nankai Trough, using 2D seismic reflection data and deep-sea drilling data, the lab showed that a water-rich layer exists along the plate boundary fault. At the drilling site, porosity and density change greatly above and below the fault.
*Illustrative imageImaging the Subsurface with 2D Seismic Surveys
In the Nankai Trough, the lab uses 2D seismic reflection data to image the shape of splay faults that branch off from the plate boundary. It also compares them with the area that slipped during the 1944 Tonankai earthquake.
MembersFaculty
- Associate ProfessorJin-Oh ParkPublications ↗
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Write a lab reviewAnonymous · Your draft is saved if you stopRelatedLabs similar to Park Lab (Marine Geology and Geophysics)
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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: “Airgun-array hg” Hannes Grobe (talk) / CC BY 3.0 (cropped)
- Imaging the Subsurface with 3D Seismic Surveys: “Nankai trough topographic” Peka / CC BY-SA 3.0 (cropped)
- Combined Analysis of Seismic Surveys and Drilling: “MARUM-IODP-04-HiRes” MARUM − Zentrum für Marine Umweltwissenschaften, Universität Bremen / CC BY 4.0 (cropped)
- Faults That Cause Tsunami Earthquakes: “JOIDES Resolution, Fremantle, 2015 (04)” Bahnfrend / CC BY-SA 4.0 (cropped)
- Imaging the Subsurface with 2D Seismic Surveys: “Damage from the Showa Tonankai Earthquake (1)” 太田金典 / CC BY 4.0 (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)
- Related lab (Watada Lab (Earth and Planetary Dynamics)): “SWOT Satellite Measures Pacific Tsunami (PIA26652)” NASA/JPL-Caltech / Public domain (cropped)
- Related lab (Furumura Lab): “Skyscrapers of Nishi Shinjuku over Kanda River from Nakano, Tokyo, Japan, 2024 May” Ximonic (Simo Räsänen) / CC BY-SA 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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