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Iidaka Lab (Structural Seismology)
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The lab works to map out the full picture of earthquakes, from their occurrence to the disasters they cause.
AboutAbout the lab
Understanding earthquakes and the disasters that follow as one continuous chain.
The Iidaka Lab studies earthquakes as physical phenomena and works to describe the full picture, from the occurrence of an earthquake to the resulting disaster.
Beneath the Japanese archipelago, the Pacific Plate and the Philippine Sea Plate are subducting, and earthquakes large and small occur almost every day.
The lab investigates where earthquakes occur, the subsurface structure through which seismic waves travel, how the waves propagate, the structure of the ground, and how it shakes. It works with related labs to capture the full picture of earthquake disasters.
The lab also conducts surveys of crustal structure on land and temporary seismic observations.
Key terms
- Plate-boundary earthquake
- An earthquake that occurs at the boundary between a subducting oceanic plate and a continental plate. It can cause huge earthquakes and tsunamis.
- Active fault
- A fault that has moved repeatedly in the recent geological period and may move again in the future.
- Crustal fluid
- Fluid, such as water, in the gaps between rocks in the crust. It is thought to affect how likely earthquakes are to occur.
ResearchResearch themes
The lab studies earthquakes as physical phenomena and conducts research to reduce earthquake disasters. It comprehensively investigates the whole chain, from the occurrence of an earthquake, through the propagation of seismic waves and the shaking of the ground, to the resulting disaster. It also investigates the structure of the crust and mantle, aiming to understand how earthquakes occur and how subduction zones behave.
*Illustrative imageUnderstanding Earthquakes Directly Beneath the Tokyo Metropolitan Area
To grasp the full picture of an earthquake directly beneath the Tokyo metropolitan area, it is necessary to understand many factors: the source, how seismic waves travel through the mantle and crust, the response of the ground, and the shaking and damage of buildings. The lab studies the settings where earthquakes occur, the subsurface structure, and the shaking, and works with related labs to capture the full picture.
*Illustrative imagePlate-Boundary Earthquakes and Their Disasters
The lab investigates the mechanism of plate-boundary earthquakes, which occur when a subducting oceanic plate rubs against the overriding plate. It aims to clarify where the plate boundary lies and what structure and physical properties it has, and to understand what kinds of disasters an earthquake can lead to.
*Illustrative imageInland Earthquakes and Their Disasters
The lab studies inland earthquakes caused by the countless active faults in the Japanese archipelago. It has shown that phenomena such as the increase in seismic activity in the Iwaki region of Fukushima Prefecture may be related to the presence of fluids in the crust, and that the source of those fluids may be the subducting plate.
MembersFaculty
- ProfessorTakashi Iidaka
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: “US Navy 110315-N-5503T-307 An aerial view of damage to Otsuchi, Japan, after a 9.0 magnitude earthquake and subsequent tsunami devastated the area in northern Japan” U.S. Navy photo by Mass Communication Specialist 3rd Class Alexander Tidd / Public domain (cropped)
- Understanding Earthquakes Directly Beneath the Tokyo Metropolitan Area: “Skyscrapers of Shinjuku 2009 January (revised)” Morio / CC BY-SA 3.0 (cropped)
- Plate-Boundary Earthquakes and Their Disasters: “Nankai Trough Fault line” The NanTroSEIZE Scientific Team / CC BY-SA 3.0 (cropped)
- Inland Earthquakes and Their Disasters: “Futagawa Fault Zone Dozono 2020 01” ja:User:Sanjo / CC BY-SA 4.0 (cropped)
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