Shadow zone

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Notion

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Science and technology

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What Wikipedia says

A seismic shadow zone is an area of the Earth's surface where seismographs cannot detect direct P waves and/or S waves from an earthquake. This is due to liquid layers or structures within the Earth's surface.

Excerpt from the Wikipedia article “Shadow zone”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: United States Geological Survey, SVG by Vanessa Ezekowitz, CC BY-SA 3.0, via Wikimedia Commons.