STRANGE SOUNDS ARCHIVE · 2018
From a meteor airburst over Michigan that produced a seismic signature to a massive bolide off Washington State, unexplained house-rattling booms in Colorado and San Diego, earthquake sounds in New York and a spectacular meteor shockwave over Minnesota, 2018 produced an unusually diverse collection of loud-boom events.
This reconstructed archive documents the most significant mystery booms, meteor shockwaves, earthquake sounds, sonic booms, phantom tremors and unexplained rumblings reported in 2018. Routine military advisories, ordinary industrial accidents, transformer explosions, gas-line failures, aircraft crashes and weaker repetitive reports have been removed.
Key facts — Mystery Booms 2018
- The January 16 Michigan bolide was one of the year’s clearest meteor-boom events. NASA estimated that a roughly six-foot-wide space rock exploded with energy equivalent to about 10 tons of TNT.
- The March 7 Washington State bolide was exceptionally energetic. NASA later described the Pacific Coast event as the most massive fireball then detected by weather radar.
- Meteor shockwaves could mimic earthquakes. Several 2018 fireballs produced rattling windows, shaking homes or seismic signals despite originating in the atmosphere.
- Not every mystery boom remained mysterious. A months-long series of explosions in Pennsylvania was eventually traced to deliberately detonated explosive devices.
- Several strong regional events remained unresolved, including recurring booms in Wheat Ridge, Colorado, a countywide disturbance in San Diego and a powerful explosion-like sound over Scotland’s Firth of Forth.
What Were the Mystery Booms of 2018?
A mystery boom is a sudden explosion-like sound, pressure wave or rumbling disturbance whose source is not immediately apparent.
The phrase describes an observation rather than a single physical phenomenon.
A meteoroid traveling through the atmosphere at hypersonic velocity can generate a powerful shockwave. A shallow earthquake can create an audible crack or rumble. Supersonic aircraft and spacecraft can produce sonic booms, while explosions, cryoseisms and unusual atmospheric sound propagation can produce similar experiences at ground level.
The important question is therefore not simply “Was there a boom?” but what physical process produced it?
For the broader science, possible causes and historical cases, visit the Mystery Booms & Rumblings Explained
hub.
How the 2018 Mystery Booms Are Classified
Strong instrumental, official or documentary evidence identifies the source.
One explanation is strongly supported, although some uncertainty remains.
The event is credibly documented, but available evidence does not establish its source.
The surviving evidence is too incomplete or contradictory for a reliable interpretation.
Unresolved does not mean paranormal. It means that the surviving evidence is insufficient to identify the physical source confidently.
January 2018 Mystery Booms
JANUARY 7 · RUSSIA
Brilliant Russian Bolide Turns Night Into Day
A powerful atmospheric flash illuminated the night sky across parts of Russia, including areas around Tatarstan, Bashkortostan and Udmurtia.
Witnesses reported an intense blue-white flash followed by an explosion-like sound and vibration.
The event was widely interpreted as a small meteoroid exploding in the atmosphere rather than a ground explosion.
Status: LIKELY
JANUARY 16 · MICHIGAN, USA
Michigan Bolide Explodes With a Shockwave Detected by Seismic Instruments
One of the strongest documented mystery-boom events of 2018 occurred over southeastern Michigan shortly after 8 p.m.
A brilliant fireball illuminated the sky and was observed by hundreds of people across Michigan and neighboring regions.
NASA estimated that the object was roughly six feet wide, entered Earth’s atmosphere at approximately 36,000 mph and exploded with energy equivalent to about 10 tons of TNT.
The resulting blast wave was strong enough to be recorded by seismic instruments and was described as equivalent to approximately a magnitude-2.0 seismic disturbance.
This did not mean the meteor caused a tectonic earthquake. The atmospheric pressure wave itself coupled into the ground and was detected seismically.
Meteorites from the fall were subsequently recovered in Michigan.
Status: CONFIRMED
Reference:
NASA — Bright Fireball Spotted Over Michigan
JANUARY 10 · TEXAS, USA
Flash and Powerful Boom Rattle North Oak Cliff
Residents in the Dallas area reported a bright flash followed by an unusually powerful boom that could be felt as a pressure wave.
Security-camera footage captured the event, and a University of North Texas astronomer interpreted the disturbance as a probable atmospheric object producing a sonic boom.
Status: LIKELY
February 2018 Mystery Booms
FEBRUARY 7 · NEW YORK, USA
Small Hudson Valley Earthquake Produces Loud Boom and Shaking
Residents across parts of Westchester and Putnam counties reported an explosion-like sound and shaking.
The disturbance was traced to a magnitude-2.2 earthquake near Lake Mohegan.
Because small shallow earthquakes may generate strong high-frequency motion close to their source, they can sound surprisingly similar to nearby explosions.
Status: CONFIRMED
JANUARY–FEBRUARY · COLORADO, USA
Recurring Nighttime Booms Shake Wheat Ridge
Police in Wheat Ridge investigated repeated reports of powerful overnight booms occurring across a broad section of the city.
Residents described single explosive sounds capable of shaking houses and buildings and, in some cases, setting off car alarms. Some witnesses also reported flashes of light.
Police officers themselves reportedly heard some of the disturbances but were unable to identify a consistent source.
Status: UNRESOLVED
Reference:
Denver7 — Wheat Ridge mystery booms
March 2018 Mystery Booms
MARCH 7 · WASHINGTON, USA
Massive Grays Harbor Bolide Produces Flash, Boom and Ground Shaking
A brilliant orange-white flash suddenly illuminated the western Washington horizon, followed by a loud boom and reports of ground shaking across Grays Harbor County.
Emergency officials received hundreds of calls.
Initial checks found no earthquake, severe weather event, aircraft emergency, ground explosion or reported crash.
The source was subsequently identified as an exceptionally energetic atmospheric fireball off the Washington coast.
NASA’s meteorite-fall database describes the March 7 event as the most massive fireball detected by weather radar at that time.
Status: CONFIRMED
MARCH · CALIFORNIA, USA
Countywide Mystery Boom Rattles San Diego
Residents across a large part of San Diego County reported a powerful boom and sudden shaking resembling a sonic boom or small earthquake.
Reports came from communities spanning East County, Vista, Coronado and other areas.
MCAS Miramar investigated whether military aircraft were responsible but did not initially identify an aircraft capable of explaining the disturbance.
Status: UNRESOLVED
Reference:
10News San Diego
MARCH 26 · SCOTLAND, UK
Mystery Explosion Shakes the Shore of the Firth of Forth
Residents and workers around Dalmeny and Cramond reported an enormous explosion-like sound from the direction of the Firth of Forth.
Workers at Barnbougle Castle described a roar lasting several seconds and a blast powerful enough to shake the foundations and send seabirds into the air.
Nearby Hound Point terminal operators reported normal operations, while emergency services had no incident capable of explaining the disturbance.
Status: UNRESOLVED
Reference:
The Scotsman
April–June 2018 Mystery Booms
APRIL–JUNE · PENNSYLVANIA, USA
Months of Mystery Explosions Terrorize Upper Bucks County — Until Investigators Find the Source
Beginning in early April, residents across rural Upper Bucks County and neighboring areas reported repeated nighttime explosions powerful enough to shake homes.
The mystery became significant enough to involve Pennsylvania State Police, the FBI, the ATF and local investigators.
Authorities investigated roughly 30 explosions, some of which left physical blast sites or craters.
The case was finally broken in late June when investigators linked explosive devices and bomb-making materials to a local suspect.
Unlike most known explosions, this case belongs in the historical mystery-boom archive because it developed for months as a genuine unexplained regional phenomenon before investigators identified a human source.
Status: CONFIRMED / RESOLVED
References:
ABC News
·
CBS Philadelphia
July 2018 Mystery Booms
JULY 27 · ARIZONA, USA
Arizona Fireball Produces Sonic Boom — Meteorite Later Found in Glendale
A bright meteor crossed Arizona during stormy weather on July 27.
Because clouds covered much of the state, relatively few people saw the fireball, but the American Meteor Society received reports from Phoenix, Chandler, Queen Creek, Paulden, Tucson and Peoria.
One observer specifically reported a sonic boom associated with the meteor.
Days later, a dark fusion-crusted meteorite was discovered in Glendale, providing physical evidence that material from the event survived atmospheric entry.
Status: CONFIRMED
Reference:
American Meteor Society
September 2018 Mystery Booms
SEPTEMBER · IOWA, USA
Loud Boom and Jolt Shake Homes Around Fairfield
Residents around Fairfield reported an abrupt explosion-like boom accompanied by a physical jolt strong enough to shake homes.
Local authorities were unable to immediately establish a source for the disturbance.
Status: UNRESOLVED
December 2018 Mystery Booms
DECEMBER 20 · MINNESOTA, USA
Brilliant Minnesota Fireball Produces Sonic Boom and Rattles Homes
A brilliant meteor illuminated the skies over Minnesota shortly after 2 a.m., triggering widespread reports of a flash followed by a powerful boom.
The event was visible across the Twin Cities region and southern Minnesota.
Subsequent reporting identified the object as a substantial atmospheric fireball, with witnesses describing a sonic boom strong enough to rattle homes.
The event demonstrates a recurring feature of mystery-boom reports: a meteor may initially be experienced only as a mysterious flash, explosion and shaking before astronomical observations reveal its atmospheric origin.
Status: CONFIRMED
Reference:
MPR News
What Caused the Mystery Booms of 2018?
| Cause | Major 2018 examples | Evidence |
|---|---|---|
| Meteors & atmospheric airbursts | Russia, Michigan, North Texas, Grays Harbor, Arizona, Minnesota | Fireball observations, videos, radar, meteorite recovery, sonic-boom reports and seismic detection |
| Earthquakes | Hudson Valley, New York | Instrumentally detected seismic event corresponding with audible and felt reports |
| Human explosions | Upper Bucks County, Pennsylvania | Physical blast sites, explosive devices and law-enforcement investigation |
| Unresolved regional disturbances | Wheat Ridge, San Diego, Firth of Forth, Fairfield | Multiple credible reports without enough evidence to identify a source confidently |
The 2018 record makes one point especially clear: “mystery boom” is not a scientific cause.
It is a description applied before the cause is known. In 2018, superficially similar house-rattling booms originated from objects exploding in the atmosphere, shallow earthquakes, deliberately detonated explosives and disturbances whose sources were never established.
The Science Behind the Mystery Booms of 2018
How Can a Meteor Create a Sonic Boom?
Meteoroids enter Earth’s atmosphere at hypersonic velocities — many times faster than the speed of sound.
Air cannot move smoothly out of the object’s path. Instead it becomes strongly compressed, creating shockwaves that propagate away from the trajectory.
When those pressure waves reach the ground, observers may hear a sharp explosion, a double boom or a longer rolling rumble.
Why Can a Meteor Boom Shake a House?
A sufficiently strong atmospheric pressure wave can vibrate windows, walls, doors and roofs.
That means an atmospheric event may feel surprisingly similar to a small earthquake even though the disturbance originates kilometers above the ground.
Can a Meteor Register on an Earthquake Seismometer?
Yes.
The Michigan bolide provides a particularly clear example.
When an atmospheric shockwave reaches Earth’s surface, part of its energy can couple into the ground. Sensitive seismometers may then detect the resulting vibrations.
This does not mean the meteor produced a tectonic earthquake. It means atmospheric energy was converted into measurable ground motion.
Why Is There Often a Delay Between a Fireball and Its Boom?
Light reaches an observer essentially instantaneously on human timescales, while sound travels through air at only a few hundred meters per second.
A meteor tens of kilometers above Earth can therefore disappear before its shockwave reaches the observer.
A delay of tens of seconds or even several minutes can be completely consistent with a meteor-generated sonic boom.
Why Can Small Earthquakes Sound Like Explosions?
Small shallow earthquakes can generate high-frequency seismic energy very close to populated areas.
That energy may be perceived as a sudden crack, bang or subterranean rumble rather than the longer rolling motion people normally associate with larger earthquakes.
What Is a Phantom Earthquake?
People sometimes report shaking across a broad region even though seismic networks record no earthquake.
Atmospheric pressure waves from meteors, supersonic aircraft, explosions and other sources can vibrate buildings strongly enough to mimic seismic shaking.
The absence of an earthquake therefore does not mean the witnesses imagined the disturbance. It means another mechanism must be investigated.
Why Are Some Mystery Booms Never Solved?
A boom may last only a fraction of a second and leave no visible trace.
Investigators may have no microphone array, infrasound sensor, radar observation, seismometer or reliable eyewitness geometry close enough to reconstruct the source.
Sound can also travel unexpectedly far through atmospheric temperature and wind layers, meaning the real source may be much farther away than witnesses assume.
The Most Important Mystery Boom Events of 2018
Not every case in an annual archive carries the same scientific or historical value. Four events stand out particularly strongly in 2018.
A documented meteor airburst, atmospheric blast wave, seismic detection and recovered meteorites make this one of the strongest scientifically documented boom cases of the decade.
A mysterious flash, boom and shaking initially baffled emergency officials before radar evidence revealed an exceptional offshore meteor event.
A months-long regional mystery ultimately became a major law-enforcement investigation and an unusual example of mystery booms with a confirmed human source.
A dramatic flash followed by a house-rattling sonic boom illustrates the classic delay between a visible meteor and the arrival of its atmospheric shockwave.
How the Mystery Booms of 2018 Archive Was Reconstructed
The original Strange Sounds posts were published while events were unfolding and often grouped several unrelated reports into monthly or worldwide compilations.
This reconstructed archive uses a stricter retrospective standard.
- Only major or unusually informative events are retained. The archive is intentionally selective.
- Routine military sonic-boom advisories are excluded. A warning that aircraft may produce noise is not itself a mystery-boom event.
- Ordinary transformer failures are excluded.
- Known gas-line and industrial explosions are excluded.
- Aircraft crashes and transportation accidents are excluded.
- Fireballs are included only when the event has a meaningful acoustic, pressure-wave or shaking component. A visually impressive meteor alone belongs in the fireball archive instead.
- Monthly compilation posts are consolidated into this page rather than treated as events.
- Later explanations replace early speculation.
- Unresolved cases are left unresolved when available evidence does not justify a specific explanation.
- Meteor and meteorite are not treated as synonyms. A meteorite is only claimed when material is known to have survived to the ground.
Some legacy Strange Sounds URLs may therefore redirect to this annual archive even when the original event no longer appears as a separate visible entry. Redirect preservation and editorial inclusion are two different decisions.
What Was Removed From the Original 2018 Archive?
Several older Strange Sounds stories previously associated with mystery booms are deliberately not included as timeline entries.
These include known transformer fires, gas-line explosions, oil-rig accidents, aircraft crashes and generic monthly boom compilations.
A bright fireball is also not automatically included. If there is no credible evidence of a boom, pressure wave or associated shaking, it belongs with fireballs, bolides and meteors rather than in the Mystery Booms archive.
This keeps the annual archive focused on events that actually help explain the mystery-boom phenomenon.
Mystery Booms 2018 — Frequently Asked Questions
What caused the mystery booms of 2018?
There was no single cause. Documented 2018 events included meteor airbursts, atmospheric shockwaves, a shallow earthquake and deliberately detonated explosives, while several regional disturbances remained unresolved.
What was the biggest meteor boom of 2018?
Several events were significant. The January Michigan bolide produced a powerful blast wave and meteorites, while the March Grays Harbor event off Washington State was an exceptionally strong radar-detected fireball.
Did the 2018 Michigan meteor cause an earthquake?
No. The atmospheric blast wave produced by the meteor was strong enough to generate ground vibrations detected by seismic instruments, but it did not trigger a tectonic earthquake.
What caused the March 2018 boom in Washington State?
The Grays Harbor flash, boom and shaking were ultimately associated with a large atmospheric bolide off the Pacific coast. The event was detected by weather radar.
What caused the mysterious Pennsylvania booms in 2018?
The repeated explosions around Upper Bucks County were eventually traced by investigators to deliberately detonated explosive devices. The case involved state police, the FBI and the ATF.
Were the 2018 San Diego booms ever explained?
The broad regional boom documented here was not conclusively explained in the contemporary reporting used for this archive. Military aircraft were considered, but no source was established confidently.
Can meteor sonic booms make the ground shake?
Yes. A strong atmospheric pressure wave can vibrate buildings and can transfer some of its energy into the ground, making an atmospheric event feel similar to a small earthquake.
Why are some 2018 fireballs not included here?
This archive focuses specifically on boom-producing phenomena. Fireballs without credible reports of sound, pressure waves or shaking belong in the broader fireball and meteor archive rather than being included simply because they were visually spectacular.
Does an unresolved mystery boom mean something unexplained by science occurred?
No. Unresolved means that the available evidence is insufficient to identify the source confidently. It does not imply paranormal activity or unknown physics.
Mystery Booms by Year
Report a Mystery Boom
Did you witness a loud unexplained boom, skyquake or unusual rumbling?
Useful reports include the exact location, local time, duration, direction of the sound, whether a flash or object was visible, whether windows or buildings shook and whether other witnesses experienced the same event.
