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Earthquake Environmental Engineering Lab
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A lab that approaches earthquake disaster prevention starting from the causes of shaking.
AboutAbout the lab
Approaching earthquake disaster prevention from the causes of shaking.
The Earthquake Environmental Engineering Lab studies the characteristics of the ground and earthquake sources that produce shaking, in order to ensure the seismic safety of buildings.
Shaking in an earthquake varies greatly with the source, the path along which the shaking travels, the ground near the surface, and the interaction among ground, foundation, and building.
By analyzing records of earthquakes in Japan and around the world, as well as records of slight ground tremors, the lab aims to predict the strong shaking of future large earthquakes with high accuracy.
It is a lab of the Disaster Prevention Research Institute (Uji Campus), also known as the Matsushima-Nagashima Lab.
Key terms
- Microtremor
- A phenomenon in which the ground is always slightly shaking because of human activity, waves, wind, and the like.
- Irregular ground
- Ground, such as at the edge of a basin, where the thickness and shape of the soil layers vary greatly from place to place.
- Nonlinear
- A change in properties as shaking becomes stronger, so that the applied force and the resulting deformation are no longer proportional.
ResearchResearch themes
The lab conducts research and development in earthquake environmental engineering needed to ensure the seismic safety of buildings. By understanding the characteristics and effects of the interaction among the source, the travel path, the ground, and buildings, it studies how to improve seismic performance in line with real conditions.
*Illustrative imagePredicting Where Damaging Shaking Occurs
Shaking near the source of a large earthquake that severely damages buildings is determined by the characteristics of the source and the ground. The lab accurately determines ground structure from earthquake and microtremor records, predicts where damaging shaking could occur and what it would be like, and applies the results to design.
*Illustrative imageDetermining Ground Structure at Basin Edges and Similar Sites
It has become clear that the way the horizontal-to-vertical ratio of microtremors and earthquake shaking varies with direction is related to the structure of irregular ground. Using this relationship in a theory-based method, the lab is developing a way to accurately estimate ground at basin edges and similar sites.
*Illustrative imageA Framework for Improving the Accuracy of Ground Structure Models
Data from the nationwide earthquake observation network keeps growing, but its enormous volume makes it a challenge to put to use. The lab aims to develop a methodology, and a framework, for efficiently improving the accuracy of existing ground structure models each time new data accumulates.
*Illustrative imageBehavior of Ground and Buildings in Strong Shaking
When strongly shaken in a large earthquake, ground and buildings show nonlinear behavior that differs from their behavior in small shaking. The lab estimates actual behavior from records of past large earthquakes, builds models of it, and develops methods to evaluate damage and risk accurately.
MembersFaculty
- ProfessorShinichi Matsushima
- Associate ProfessorFumiaki Nagashima
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: “Overview Seismic Waves” LukeTriton, Steven Earle, Mario Bačić, Lovorka Librić, Danijela Jurić Kaćunić, Meho Saša Kovačević / CC BY-SA 4.0 (cropped)
- Predicting Where Damaging Shaking Occurs: “Fault breccia zone (Rampart Range Fault, Garden of the Gods, Colorado Springs, Colorado, USA) 3” James St. John / CC BY 2.0 (cropped)
- Determining Ground Structure at Basin Edges and Similar Sites: “Aerial view of Upper Geyser Basin ( )” Yellowstone National Park from Yellowstone NP, USA / Public domain (cropped)
- A Framework for Improving the Accuracy of Ground Structure Models: “The USGS Seismic Monitoring Facility at Guantanamo -c” 作者不詳 / Public domain (cropped)
- Behavior of Ground and Buildings in Strong Shaking: “Soil liquefaction ( )” Martin Luff from Christchurch, New Zealand / CC BY-SA 2.0 (cropped)
- Related lab (Building Earthquake Engineering Lab): “Kinematically equivalent building models on a shake-table” Shustov / CC BY-SA 3.0 (cropped)
- Related lab (Building Vibration Lab): “Te Papa's base isolators” Museum of New Zealand Te Papa Tongarewa / CC BY-SA 4.0 (cropped)
- Related lab (Spatial Structure Development Engineering Lab): “Three dimensional truss construction Unic Rotarex®” Marius Rotar / CC BY-SA 4.0 (cropped)
- Related lab (Building Construction Lab): “Reinforced concrete rusted rebars german bunkers Pointe du Hoc” Jebulon / CC0 (cropped)
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