This sound was repeatedly recorded during summer, 1997 on the Equatorial Pacific Ocean autonomous hydrophone array. The sound rises rapidly in frequency over about one minute and was of sufficient amplitude to be heard on multiple sensors, at a range of over 5,000 km. It yields a general location near 50oS; 100oW. The origin of the sound is unknown.
This sound was recorded on March 1, 1999 on the Equatorial Pacific Ocean autonomous hydrophone array. The source of the sound is unknown, but is sufficiently loud to be heard over the entire array. The duration is approximately 15 seconds and is severely band limited. The approximate origin is 1999JD60 2218Z near 15S, 98W.
This sound was recorded on March 5, 1997 on the Equatorial Pacific Ocean autonomous hydrophone array. The sound rises to a quasi-steady frequency. The origin of the sound is unknown.
This sound was recorded May 19, 1997 on the Equatorial Pacific Ocean autonomous hydrophone array. The sound slowly descends in frequency over about 7 minutes and was of sufficient amplitude to be heard on three sensors at 95W, and 8S, 0, and 8N, at a range of nearly 2,000 km. This type of signal has not been heard before or since. It yields a general location near 15oS; 115oW. The origin of the sound is unknown.
This sound was recorded by the autonomous hydrophone deployed at 8oN, 110oW on July 7, 1997 at 0730Z. Origin of the signal is unknown, and it was not detected on any other hydrophone. The band of energy between 1 and 6 Hz represents "strumming" of the mooring in mid-water currents.
This sound was present when PMEL began recording SOSUS in August, 1991. It consists of a long train of narrow-band upsweeping sounds of several seconds duration each. The source level is high enough to be recorded throughout the Pacific. It appears to be seasonal, generally reaching peaks in spring and fall, but it is unclear whether this is due to changes in the source or seasonal changes in the propagation environment. The source can be roughly located at 54o S, 140oW, near the location of inferred volcanic seismicity, but the origin of the sound is unresolved. The overall source level has been declining since 1991 but the sounds can still be detected on NOAA's equatorial autonomous hydrophone arrays.
I find these sounds really scary, or at least the Bloop ... Why?
Cause scientists say the source of the sound must be at least half the size BIGGER than a blue whale to make that sound.
Ever heard of them? The most recent one is the "Bloop"
They are sounds that scientists have recorded from oceans and can't identify.
Here they are, it's kinda scary .. But if you dare, you can listen to them ^^
The Bloop:
http://www.pmel.noaa.gov/vents/acoustics/sounds/bloop.wav
This sound was repeatedly recorded during summer, 1997 on the Equatorial Pacific Ocean autonomous hydrophone array. The sound rises rapidly in frequency over about one minute and was of sufficient amplitude to be heard on multiple sensors, at a range of over 5,000 km. It yields a general location near 50oS; 100oW. The origin of the sound is unknown.
Julia:
http://www.pmel.noaa.gov/vents/acoustics/sounds/julia_sound.wav
This sound was recorded on March 1, 1999 on the Equatorial Pacific Ocean autonomous hydrophone array. The source of the sound is unknown, but is sufficiently loud to be heard over the entire array. The duration is approximately 15 seconds and is severely band limited. The approximate origin is 1999JD60 2218Z near 15S, 98W.
Train:
http://www.pmel.noaa.gov/vents/acoustics/sounds/train.wav
This sound was recorded on March 5, 1997 on the Equatorial Pacific Ocean autonomous hydrophone array. The sound rises to a quasi-steady frequency. The origin of the sound is unknown.
Slow Down:
http://www.pmel.noaa.gov/vents/acoustics/sounds/noise97139.wav
This sound was recorded May 19, 1997 on the Equatorial Pacific Ocean autonomous hydrophone array. The sound slowly descends in frequency over about 7 minutes and was of sufficient amplitude to be heard on three sensors at 95W, and 8S, 0, and 8N, at a range of nearly 2,000 km. This type of signal has not been heard before or since. It yields a general location near 15oS; 115oW. The origin of the sound is unknown.
Whistle:
http://www.pmel.noaa.gov/vents/acoustics/sounds/whistle16x.wav
This sound was recorded by the autonomous hydrophone deployed at 8oN, 110oW on July 7, 1997 at 0730Z. Origin of the signal is unknown, and it was not detected on any other hydrophone. The band of energy between 1 and 6 Hz represents "strumming" of the mooring in mid-water currents.
Upsweep:
http://www.pmel.noaa.gov/vents/acoustics/sounds/upsweep20x.wav
This sound was present when PMEL began recording SOSUS in August, 1991. It consists of a long train of narrow-band upsweeping sounds of several seconds duration each. The source level is high enough to be recorded throughout the Pacific. It appears to be seasonal, generally reaching peaks in spring and fall, but it is unclear whether this is due to changes in the source or seasonal changes in the propagation environment. The source can be roughly located at 54o S, 140oW, near the location of inferred volcanic seismicity, but the origin of the sound is unresolved. The overall source level has been declining since 1991 but the sounds can still be detected on NOAA's equatorial autonomous hydrophone arrays.
I find these sounds really scary, or at least the Bloop ... Why?
Cause scientists say the source of the sound must be at least half the size BIGGER than a blue whale to make that sound.
Discuss!