Subterranean rumbling

Short description: Sound generated by earthquakes

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Earthquakes

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Causes

* Fault movement
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Characteristics

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Subterranean rumbling is a phenomenon in which the ground vibrates and makes sounds due to an earthquake.

During earthquakes or volcanic eruptions, the ground vibrates, sometimes creating short-period seismic wave motion (ground motion) that reaches the air and becomes sounds (sound waves), and low sounds can be heard.[1]

This often occurs during shallow-focus earthquakes and earthquake swarms. Even microearthquakes that produce noticeable tremors can sometimes produce rumbling.

Hard ground tends to amplify rumbling.

In earthquake-prone Japan rumbling is frequently observed near Mt. Tsukuba in Ibaraki Prefecture. This is believed to be due to local exposure of basement rocks.[2] During the 1965 Matsushiro earthquake swarm, a remarkable subterranean rumbling was observed.[3][4]

## References

1. ↑ Tokuji Utsu『地震学 第3版』P.308 ISBN 9784320046375
2. ↑ "地鳴り" (in ja). kotobank. https://kotobank.jp/word/地鳴り.
3. ↑ "松代群発地震50年特設サイト". https://www.data.jma.go.jp/eqev/data/matsushiro/mat50/disaster/higai.html.
4. ↑ "鳴動" (in ja). kotobank. https://kotobank.jp/word/鳴動.

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