PSI - Issue 54

Koji Uenishi et al. / Procedia Structural Integrity 54 (2024) 67–74 Uenishi / Structural Integrity Procedia 00 (2023) 000–000

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in 1995 do suggest the possible effect of the vertical shock in generating surprising structural failures near epicenters,

and it seems very difficult to explain the causes of the failures systematically using the traditional method

considering low-frequency horizontal shaking only. As well known, thanks to Aki and Richards (1980) who

informatively summarized the low-pass filtered, lower-frequency or long-period seismology, this traditional seismic

method is now intensively used. But Aki (2005) has mentioned more recently that, even when the quality, quantity

and computational processing capabilities related to seismological data have been improved, it is difficult to apply

the traditional low-frequency seismology to the study of higher frequencies over 1 Hz. Now is the time that the

crucial roles played by higher-frequency seismic waves and vertical shocks should be accepted (Uenishi, 2021), and

in order to more correctly comprehend the dynamics of earthquakes and their effect in the near field near epicenters,

the valuable datasets obtained through near-field monitoring of blast-induced vibrations and earthquakes in mines

should be also utilized. Or vice versa, the knowledge gained through the study of the vertical shock of natural

earthquakes will assist in comprehending mining-induced earthquakes more deeply and improving the dynamic

stability of underground mines and structures in the vicinity.

Acknowledgements

The strong motion data have been provided by the K-NET and KiK-net of the National Research Institute for

Earth Science and Disaster Resilience (NIED), Japan (doi:10.17598/NIED.0004). The research has been financially

supported by the Japan Society for the Promotion of Science (JSPS) through the “KAKENHI: Grant-in-Aid for

Scientific Research (C)” Program under grant number 23K04021.

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