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ULTRA LOW FREQUENCY

ultra low frequency (ULF)
Cycles per second: 300 Hz to 3000 Hz

Wavelength: 1000 km to 100 km

Ultra Low Frequency (ULF) is the frequency range between 300 hertz and 3000 hertz. This band is used for communications in mines, as it can penetrate the earth. [1]

Contents

Earthquakes

Some monitoring stations have reported that earthquakes are sometimes preceded by a spike in ULF activity. A remarkable example of this occurred before the Loma Prieta Earthquake in California in 1989. Researchers are attempting to learn more about this correlation to find out whether this method can be used as part of an early warning system for earthquakes.

See also

References

  1. ^ http://www.weather.nps.navy.mil/~psguest/EMEO_online/module3/module_3_1.html

External articles

Radio spectrum
ELF SLF ULF VLF LF MF HF VHF UHF SHF EHF
3 Hz 30 Hz 300 Hz 3 kHz 30 kHz 300 kHz 3 MHz 30 MHz 300 MHz 3 GHz 30 GHz
30 Hz 300 Hz 3 kHz 30 kHz 300 kHz 3 MHz 30 MHz 300 MHz 3 GHz 30 GHz 300 GHz



The Electromagnetic Spectrum
(Sorted by wavelength, short to long)

Gamma ray | X-ray | Ultraviolet | Visible spectrum | Infrared | Terahertz radiation | Microwave | Radio waves

Visible (optical) spectrum: Violet | Blue | Green | Yellow | Orange | Red

Microwave spectrum: W band | V band | K band: Ka band, Ku band | X band | C band | S band | L band

Radio spectrum: EHF | SHF | UHF | VHF | HF | MF | LF | VLF | ULF | SLF | ELF

Wavelength designations : Microwave | Shortwave | Mediumwave | Longwave
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