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Upsweep Sound
Since 1991, a mysterious sound has pulsed from the Pacific. It rises in frequency, peaks in spring and fall, and comes from a volcanic region. It might be underwater volcanism. But it's remarkably rhythmic. Something pulses in the deep.
1991 - Present
Pacific Ocean
10+ witnesses
Upsweep has been heard continuously since 1991.
The Discovery
1991:
- NOAA detection
- Pacific Ocean
- Ongoing sound
- Still heard today
- Decades of mystery
The Sound
What it’s like:
- Rising frequency
- Narrowband
- Seasonal variation
- Peaks in spring/fall
- Rhythmic pattern
The Source
Possible origin:
- Volcanic area
- Near Pacific-Antarctic Ridge
- Underwater geothermal
- Gas venting
- Consistent location
The Mystery
What’s strange:
- Very regular
- Seasonal pattern
- Decades long
- No confirmed source
- Continues today
Scientific Interest
Research:
- Monitored continuously
- Pattern analyzed
- Source sought
- Volcano theory
- Not confirmed
The Implications
What it means:
- Ocean is alive
- Unknown processes
- Long-term phenomena
- Much to discover
- Deep earth speaks