Center for Railway Earthquake Engineering Research

Engineering, Japan

Center for Railway Earthquake Engineering Research

Engineering, Japan
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Murono Y.,Center for Railway Earthquake Engineering Research
Quarterly Report of RTRI (Railway Technical Research Institute) | Year: 2015

The Railway Technical Research Institute opened the Center for Railway Earthquake Engineering Research on April 1, 2014 amid increasing concern about the risk of seismic disasters caused in particular by massive earthquakes. Violent earthquake disasters are becoming more common and more complex. In order to achieve safer railway systems able to cope with these conditions, the center was established as a unique "base" for railway-seismic technology in Japan. The center also integrates RTRI's research resources on quake-motion, seismic design and countermeasure, and early warning. This report introduces the role of CREER and recent research into earthquake-related technology.


Miyakoshi H.,Center for Railway Earthquake Engineering Research | Tsuno S.,Center for Railway Earthquake Engineering Research
Quarterly Report of RTRI (Railway Technical Research Institute) | Year: 2014

In the case of local earthquakes, a method for predicting earthquake ground motion directly using P-waves observed in deep boreholes, makes it possible to issue earthquake early warnings more simply and reliably compared with the present system. In addition, a method for predicting earthquake ground motion using S-waves observed in deep boreholes and S-wave velocity structures, makes it possible to show the planar distribution of earthquake ground motion, which may narrow down the areas where emergency inspections should be conducted following earthquakes. To develop those two methods, investigations were conducted into the relationship between the peak amplitudes of earthquake motion on the surface and those in deep boreholes using seismic records from KiK-net.


Sakai K.,Center for Railway Earthquake Engineering Research | Murono Y.,Center for Railway Earthquake Engineering Research
Quarterly Report of RTRI (Railway Technical Research Institute) | Year: 2015

This paper proposes a simple method to evaluate ground-surface waveforms using both the natural period of the ground and waveforms in the engineering bedrock. In this research, the "Equivalent Single Degree of Freedom method" is proposed and is based on the results of static push-over analyses of many grounds with various properties. A comparison was made of waveforms of multi-layered ground, obtained from the proposed method, using dynamic analysis. It was then confirmed that these waves are almost identical, and that the proposed method is applicable to the evaluation of the surface motion. Although information is still lacking about soil properties in regions where there are existing railway lines, proposed method enables economical dense calculation of trackside surface motion. These sets of waveforms will be utilized to identify locations where devastating damage is expected in the case of a strong earthquake.

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