地盤研究財団
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Research and Activity
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Understanding Earthquakes
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TOP > Research and Activity > Understanding Earthquakes
Understanding Earthquakes
 
Investigation and Study for Strong Ground Motion Prediction and Earthquake Disaster Prevention
At this point in which earthquake predictions are not yet to be practical, in order to prepare for the inevitable major earthquakes, the most effective advanced measures that could be taken for earthquake disaster mitigation would be to consider a specific fault in a targeted area of examination, prepare a source model of that fault’s potential activity, and predict strong ground motions near the fault. For this reason, our foundation is engaged in developing methods to predict strong ground motion and in its corresponding basic research. Furthermore, the foundation designs and develops earthquake observation alert systems which automatically collects and transmits strong ground motion observation information necessary to take earthquake disaster countermeasures.
Research on Strong Ground Motion Prediction Methods
We consider a specific fault in a targeted area and prepare a source model of that fault’s potential activity to predict strong ground motions near the fault. The figure is a simulation of the seismic motion of Tonankai-Nankai earthquake that is expected to occur in the near future.
▲大阪湾岸部での予測強震動例
The Development of Earthquake Observation Alert Systems
We develop and design quasi-real-time earthquake observation alert systems which utilize information communication technology (ICT) to automatically collect and transmit strong ground motion observation data that is necessary for taking earthquake disaster countermeasures. The results of our efforts are currently in use by the Committee of Earthquake Observation and Research in the Kansai Area (CEORKA) with their earthquake observation network.
Research on Source Fault model
To be able to make highly accurate strong ground motion predictions, it is necessary to properly estimate the source fault model of the targeted study area. The figure shows the final slip distribution on the fault plane of inland crustal earthquakes that have occurred in Japan in the past.
Research on Seismic Wave Propagation
Research on seismic wave propagation from the source fault to the targeted area is also an important study for highly accurate strong ground motion predictions. The figure compares the empirical amplification characteristics of a given observation point for strong ground motion observation records to the theoretical amplification characteristics calculated by an estimated underground structure model. By analyzing the ground amplification characteristics like these, we gain a better grasp on how easily an area could shake and use it to make reliable, strong ground motion predictions.
Research on Underground Structural Models
Aiming to predict earthquake intensities more accurately, we are preparing detailed three-dimensional underground structure models based on data from various underground structure surveys.

▲大阪湾(左)・琵琶湖(右)周辺の基礎深度分布



Geo-Research Institute
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