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  6. What are swarm earthquakes? An explanation of their causes, characteristics, past examples, and disaster prevention measures.

What are swarm earthquakes? An explanation of their causes, characteristics, past examples, and disaster prevention measures.

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last updated:Jan 15, 2026

トキワシステム
トキワシステム
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A clear explanation of the differences between swarm earthquakes and other earthquakes, and ways to alleviate anxiety!

Recently, there have been more opportunities to hear the term "swarm earthquake" in the news and other media. A swarm earthquake is a phenomenon where earthquakes occur repeatedly in a certain area over a short period of time, and it has characteristics that differ from typical isolated earthquakes. Many people may be worried, thinking, "Could this be a precursor to a major earthquake?" In this article, we will clearly explain the definition and causes of swarm earthquakes, past occurrences, their relationship with major earthquakes, and the disaster prevention measures we can take. *For detailed content of the column, you can view it through the related links. For more information, please feel free to download the PDF or contact us.

    Earthquake-proof and vibration-damping equipment
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What are swarm earthquakes? An explanation of their causes, characteristics, past examples, and disaster prevention measures.

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  • What is a seismic damping device called "seismic damper"?
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Proposal for Application-Specific Plans for the Vibration Control Device "α Damper Ex II"

Proposal for Application-Specific Plans for the Vibration Control Device "α Damper Ex II"

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Seismic control device for wooden houses αDamperExII (αDamperExII)

Seismic control device for wooden houses αDamperExII (αDamperExII)

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Hydraulic Vibration Control Device for Wooden Houses 'α Damper ExII' *Pamphlet included

Hydraulic Vibration Control Device for Wooden Houses 'α Damper ExII' *Pamphlet included

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Seismic control device for wooden houses αDamperExII

Seismic control device for wooden houses αDamperExII

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[Construction Example] α Damper EXII New Construction Project

[Construction Example] α Damper EXII New Construction Project

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[Construction Case] α Damper EXII Renovation Work

[Construction Case] α Damper EXII Renovation Work

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Earthquake safety measures for peace of mind

Earthquake safety measures for peace of mind

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Seismic resistance level maintained by seismic dampers - Building homes that can be lived in even after a major earthquake.

Seismic resistance level maintained by seismic dampers - Building homes that can be lived in even after a major earthquake.

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Started providing evaluation reports that clearly show the effects of the α Damper Ex II installation at a glance.

Started providing evaluation reports that clearly show the effects of the α Damper Ex II installation at a glance.

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The superiority of the α Damper ExII in suppressing the reduction of building strength due to major earthquakes.

The superiority of the α Damper ExII in suppressing the reduction of building strength due to major earthquakes.

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National Seismic Hazard Map 2018 Edition

National Seismic Hazard Map 2018 Edition

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トキワシステム

トキワシステム

Building materials, supplies and fixtures manufacturers

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Tokiwa System Co., Ltd. is a company that develops, manufactures, and sells the seismic control device αDamperExII. It is a pioneer in seismic control devices using hydraulic dampers. The αDamperExII has received the number one track record and trust in the Tokai and Tonankai earthquake warning areas, and it will soon be adopted in 10,000 buildings. The αDamperExII is a hydraulic seismic control device that reduces building deformation caused by earthquake shaking by approximately half.

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