PSI - Issue 54

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Available online at www.sciencedirect.com

ScienceDirect

Available online at www.sciencedirect.com ScienceDirect

Structural Integrity Procedia 00 (2023) 000–000

ScienceDirect

www.elsevier.com/locate/procedia

Structural Integrity Procedia 00 (2023) 000–000

www.elsevier.com/locate/procedia

Procedia Structural Integrity 54 (2024) 67–74

International Conference on Structural Integrity 2023 (ICSI 2023)

Towards detecting the strong vertical shock

induced by a shallow earthquake

Koji Uenishi a, * Koji Uenishi a, *

a Department of Advanced Energy, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, 277-8561 Chiba, Japan

Abstract

This contribution treats a long standing enigma of the strong vertical shock, often felt near an epicenter on the onset of seismic

This contribution treats a long standing enigma of the strong vertical shock, often felt near an epicenter on the onset of seismic shaking but not recorded by seismographs. Beginning with the 1995 Hyogo-ken Nanbu (Kobe), Japan, earthquake, not only the

shaking but not recorded by seismographs. Beginning with the 1995 Hyogo-ken Nanbu (Kobe), Japan, earthquake, not only the verbal evidences by a number of people for various earthquakes at different places but also the unique dynamic failures induced

verbal evidences by a number of people for various earthquakes at different places but also the unique dynamic failures induced in underground and surface structures do support the idea of the existence of such strong vertical shock generated by relatively

in underground and surface structures do support the idea of the existence of such strong vertical shock generated by relatively shallow earthquakes. However, due to the lack of capability of appropriately detecting higher frequencies at an audible level over

shallow earthquakes. However, due to the lack of capability of appropriately detecting higher frequencies at an audible level over 16 Hz, historically it has been difficult for a seismograph to “correctly” record the shock involving vibrations of very high

16 Hz, historically it has been difficult for a seismograph to “correctly” record the shock involving vibrations of very high frequencies. The discussion is mainly for natural earthquakes and earthquake swarms currently being monitored near epicenters

frequencies. The discussion is mainly for natural earthquakes and earthquake swarms currently being monitored near epicenters in Japan, but it is of importance also in interpreting mining-induced earthquakes and enhancing the dynamic safety of nearby

in Japan, but it is of importance also in interpreting mining-induced earthquakes and enhancing the dynamic safety of nearby mines and structures in the underground and on the surface.

© 2023 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0 ) Peer-review under responsibility of the scientific committee of the ICSI 2023 organizers mines and structures in the underground and on the surface. © 2023 The Authors, Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) © 2023 The Authors, Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0)

Peer-review under responsibility of the scientific committee of the ICSI 2023 organizers Keywords: Dynamic structural failure; Audible earthquake; Higher frequency

Keywords: Dynamic structural failure; Audible earthquake; Higher frequency

1. Introduction

In the Tokyo area, we experience seismic shaking of different kinds that is caused by various types of shallow /

In the Tokyo area, we experience seismic shaking of different kinds that is caused by various types of shallow / deep earthquakes occurring just underneath or in the far field. Indeed, even staying in the same room of the identical

deep earthquakes occurring just underneath or in the far field. Indeed, even staying in the same room of the identical building, we “feel” different shaking for each individual earthquake. Normally, the experienced shaking lasts a few

building, we “feel” different shaking for each individual earthquake. Normally, the experienced shaking lasts a few

* Corresponding author. Tel.: +81-4-7136-3824; fax: +81-4-7136-3824.

* Corresponding author. Tel.: +81-4-7136-3824; fax: +81-4-7136-3824. E-mail address: uenishi@k.u-tokyo.ac.jp

E-mail address: uenishi@k.u-tokyo.ac.jp

This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the scientific committee of the ICSI 2023 organizers

Peer-review under responsibility of the scientific committee of the ICSI 2023 organizers

2452-3216 © 2023 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the scientific committee of the ICSI 2023 organizers 10.1016/j.prostr.2024.01.057

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