Mystery Booms, Part 3
<p>A common geological source of mystery booms is shallow earthquakes. These are more common than people think, even more than many geologists recognize. Multiple booms over several days, weeks, or years that can’t be pinpointed to any known source may be indicative of shallow earthquakes. I’ll expand on earthquake noise below.</p>
<p>Subsidence of abandoned underground mine voids can also create booming noises and possibly register as small earthquakes. In specific areas, booms can come from volcanic activity, landslides, or methane eruptions (underwater “mud volcanoes”, permafrost collapse, seafloor bubbles). Recently, <a href="https://spookygeology.com/wiki/booming-sounds-attributed-to-karst/" rel="noopener ugc nofollow" target="_blank">karst activity underground has been implicated in mystery booming sounds</a>, especially after a very large storm event that causes huge volumes of water at high velocity to travel through underground void space, possibly moving debris with it.</p>
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