Windows shake. A dull cannon-like report rolls across a lake or coastline. No storm is visible, no explosion is reported, and earthquake monitors show little or nothing. Such events are often grouped under names like “Seneca Guns,” but the label describes an experience, not a single proven cause. [1]
The ground can sound like a cannon
The simplest explanation is often nearby human activity: construction, blasting, heavy vehicles or an aircraft crossing the sound barrier. Natural sources can be equally ordinary. A small, shallow earthquake can send high-frequency vibrations to the surface as audible sound even when shaking is weak. Deeper earthquakes lose more of those frequencies before they reach listeners. During severe cold, freezing groundwater can crack soil and rock in a frost quake, while buildings themselves expand and contract. [1]
The source may be above the clouds
The source may be above clouds. Meteors enter the atmosphere at hypersonic speed, building pressure waves; fragmentation can add explosive energy and produce a boom strong enough to shake houses. [3][4] On 1 January 2022, reports across southwestern Pennsylvania coincided with the GOES-East lightning mapper detecting a bolide above clouds. A nearby infrasound station recorded its blast wave. [3] The witnesses could not see the fireball, but sensors could.
Sensors turn sound into a location
Seismographs do not hear the world the way people do. Atmospheric events may leave no trace, or a short high-frequency pulse unlike an earthquake. If several stations record a disturbance moving at the speed of sound in air rather than seismic-wave speed in rock, that favours an atmospheric origin. A wide pattern of reports without a corresponding earthquake can point the same way. Temperature inversions and calm surface winds may bend sound and carry it farther, separating the listener from the source. [2]
A famous lake still has no verdict
Seneca Lake in New York remains interesting precisely because newer measurements did not close the case. A Cornell, SUNY and state environmental team sampled methane above lakebed pockmarks in 2025. Concentrations inside the pockmarks matched those elsewhere, arguing against continuous leakage. Researchers considered episodic gas bubbles, which would expand while rising through the water, but methane isotopes suggested mixed biological and fossil sources and did not identify the source of the booms. The next proposed step was seismic listening near the lake. [5]
Unexplained is a data condition
That is why a “mystery boom” should not be treated as evidence of one exotic worldwide phenomenon. The same sensation can be produced by ground motion, pressure waves, ice, aircraft or meteors. A case stays unexplained when timing, location, weather, recordings and sensor coverage are insufficient—not because all conventional causes have been ruled out.
What to keep in mind
These sources catalogue plausible mechanisms and several measured examples; they do not provide a universal explanation for every report. The Seneca Drums hypothesis has not been confirmed, and the absence of a seismic signal cannot by itself prove that a sound came from the atmosphere.
Sources & context
Numbered references link the explanation to its sources. Hypothetical examples and visual metaphors are labelled in the text. Checked 5 November 2026.
- U.S. Geological Survey — Earthquake Booms, Seneca Guns, and Other Sounds
- U.S. Geological Survey — Sonic Booms
- NOAA NESDIS — Earth from Orbit: Catching Bolides
- NASA — Fireball Season: Answering Your Meteor Questions
- Cornell Chronicle — The mystery of the Seneca Drums persists
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