Presumed, but not yet verified as a man-made signal. Detected at various locations worldwide. With amateur equipment, it is not easy to determine eventual frequency shifts, so signal is listed as a 2.5 Hz carrier. So far the signal is not connected with any known geophysical events. Most likely not originating from HAARP - Gakona in Alaska USA. They have little success, with the generation of ELF signals of reasonable strength, over anything then relative short distances.
00000.0006 - 00000.012:unid/none:experimental
ULF transmitter, Kola peninsula,
ACTIVE, but no recent info
Designed and operated by RIPR (Russian Institute of Powerful Radio- structures) in St. Petersburg, Russia. As the Russian scientists call it; the first "easy flexible ULF facility for geophysical applications" As a feed line for the grounded dipole antenna, is used a 108 km length of a HV power transmission line, owned by the Kola Peninsula Power line Company. The HV line goes from their hydroelectric power plant, near Serebryansky by the Varonya river, to Kola-Kildinstroy south of Murmansk. The RIPR portable 50 kW transmitter is able to supply 60-100 A in the line, at these frequencies; 0.6 - 12 Hz band, 2-3 Hz band, and single frequency tests at 4, 8, 10 and 12 Hz.
NAVY ELF communication facility, Republic Michigan, USA:MSK
00000.076:unid:US NAVY ELF communication facility, Clam Lake Wisconsin, USA:MSK
The US ELF signal has 76 Hz centre frequency, with +/- 4Hz shift, 80 Hz for "1", 72 Hz for"0". For maximum signal coverage, the two stations operate simultaneously. Secondary frequency is reported as 00000.045 kHz. Other operational frequencies are technically possible, but so far not reported. The special - AC deep grounding system, in use for the ELF antenna, was designed and installed by LORESCO International.
The deep boreholes for the grounding system, are up to 3.2 km (2 US miles) down in the Laurentian Shield. The US Navy ELF transmitter facilities are believed to have an input power of 3 MW. As the efficiency of the antenna system is rather low, the predicted ERP is only 3 Watt (!).
Navy ELF communication facility, Kola Peninsula, RUSSIA:MSK
Transmission format: 82 Hz N0N and (multichannel?) MSK. Prior to message is a
presumed "bellringer" or message-follows signal: 0.4 Hz shift down to 81.6 Hz for 8 minutes, then up to 82.7 Hz for 4 minutes. This initial signal sequence is directly followed by a downshift to 81 Hz for 38 seconds and a up-shift to 83.3 Hz for 22 seconds. After this comes the message, using these shifts, for a total of 16 minutes. A complete message sequence lasts for 29 minutes.
"Zevs" is reported to have an operational frequency range of 00000.031 to 00000.166 kHz. This Russian ELF transmitter is nicknamed “ZEVS”.