Top 10 Unexplained Sounds

Earth has a plethora of unexplained phenomena, which spawned many interesting theories among researchers. As we are naturally good at recognizing sound patterns, some sounds remain strange or unknown. From hums to skyquakes, here are ten unknown sounds that confused scientists. This also includes sounds that were once considered unexplained until their discovery.
The Top Ten
1 52-hertz Whale

Unlike blue whales which usually emit sounds ranging from 10 Hz to 39 Hz, there is an unknown species of whales that emits a higher frequency noise up to 52 Hz instead. In fact, the sound has been detected since the 1980s in various locations, but never seen except its noise being detected by hydrophones. It's believed that it's the only whale that emits this particular noise, hence it's dubbed the "loneliest whale". It's been speculated by scientists that the whale may either be deaf, or it may have been born with birth defects. Many pieces of media have also been made based on the 52-hertz whale.

2 Bloop

It's no doubt that strange underwater noises intrigue people since the majority of oceans remain unexplored. The Bloop is a name for a mysterious yet extremely powerful underwater noise detected in the ocean in 1997. The sound starts with a rising frequency starting from a rumble, which lasted over one minute and was powerful enough to be heard in multiple sensors. Later on it has been widely speculated that the noise may have come from an icequake, as ice masses splitting or calving from each other are associated with the bloop noise.

3 Bio-Duck

First recorded in 1960 in the Southern Ocean, known by its low yet repetitive frequency noises, it has been dubbed as the "Bio-Duck". The frequency ranges from 60 Hz to 100 Hz, and lasts around one to three seconds for each gap. It was also noted that the sound was most frequent in winters. The origin of the sound remained unidentified for decades until it was discovered that the noise was coming from antarctic minke whales. Although the purpose of the sound remains a mystery, it's been theorized that mating or feeding play a role in it.

4 The Forest Grove Sound

Occurring around February 2016 in Oregon. A mysterious scream shocked neighbors around night out of nowhere in Forest Grove which lasted from a few seconds to minutes. The noise was comparable to that of a broken train noise or car brakes, but it was commonly referred as a "mechanical scream". The noise isn't as mysterious as it may sound, but it was described as very annoying to the neighbors. It has been speculated that it may be caused by a gas leak, or a faulty water valve, while some suggested even more paranormal activity such as UFOs or something more ominous. However not even the fire department could pinpoint the origin of the sound. To this day the noise still remains to be solved

5 Singing of Colossi of Memnon

The Colossi of Memnon consists of two massive statues situated in the Motuary Temple of Amenhotep III, and still remains for thousands of years. The colossi were believed to ward off evil from the temple of Pharaoh. Until in 27 BC an earthquake destroyed a part of the northern colossus. After the event, the lower part of the statue was widely believed to sing every dawn, which often occurred within February and March. Although the statues unfortunately didn't sing themselves, the noises were largely connected to heat and humidity of the dew inside the stones. Sometime around the year of 199, Septimius Severus repaired the statue, and the phenomenon disappeared.

6 Skyquake

Skyquakes may not refer to the sky shaking, as if it was similar to an earthquake. Instead, it's a phenomenon associated with loud booming noises in the sky. One notable event connected to this phenomenon lies in the city of Barishal in Bangladesh that would shock thousands of residents due to its loud booming noises in the 19th century, but no one was able to pinpoint the origin of the sound, as the sound wasn't connected to any earthquakes or nearby explosions. Later it has been speculated that it may have come from a cannon, but there was no conflict nearby that would cause such a noise. Another common speculation is that it could be connected to skyquakes.

7 Upsweep

This is another unexplained underwater noise that's been detected in the Pacific in August 1991. It consists of a long series of upsweeping sounds which lasted around a few seconds for each interval. The sound is believed to be connected with the seasons, with sounds being of highest concentration between spring and autumn. Although the source is never pinpointed, it's speculated that it may have connections to volcanic activity.

8 The Hum

The Hum consists of a persistent, yet low tone noise that resembles "humming". Strangely, this phenomenon only affects a few people, yet the noise is reported worldwide. Not only the sound occurs the same to all people, but it can resemble as a buzzing or a droning sound. It has been speculated that the hum may be caused from either industrial activity, tinnitus, or other natural effects, while others have bizarre speculations such as secret government activity or extraterrestrial activity. One notable place where the hum often occurs is the Taos Hum.

9 Julia

This is another yet creepy sound coming from underwater. It was so loud, that the noise spread across the whole Pacific region, which was heard for about over 2 minutes. If you listen closely, it sounds as if there was a huge sea monster lurking in the ocean, but it's believed that a huge iceberg may have crashed into the water from Antarctica.

10 The Whistle

Along with similar underwater noises such as Julia and the Upsweep, this is another unexplained noise detected by the NOAA in July 1997. The source of the noise remains unknown, but it's believed to come from the Pacific Ocean. Similarly, the noise is attributed to volcanic activities. However due to the location not being triangulated, it still remains unknown.

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