McNeill and Labson ( 1991) describe geological mapping using VLF fields. The health effect of VLF radiation on organs has also been studied (King and Sandler 1996).
Additionally, blue jets and red sprites, generating very short period (0.1–300 ms) but high amplitude VLF fields, have been inspected (Rodger et al 1998). The influence of HF signals incident on the ionosphere and generating VLF waves has been investigated by many scientists (Cho and Rycoft 2001, Vaskov et al 1995, Barr 1998, Sergeinko et al 1997). Natural VLF signals are monitored for the purpose of predicting earthquakes (Bella et al 1998, Molchanov 1998, Hayakawa and Molchanov 2000, Nagao et al 2002), predicting volcanic eruptions (Kauahikaua et al 1996) and monitoring underground nuclear explosions (Mikhailov et al 1998). An electromagnetic wave in the VLF band may be used for direction finding and submarine communication, as this band displays little scattering and low attenuation, as it propagates through the ionosphere and seawater. The very low frequency (VLF) part of the electromagnetic spectrum ranges from 3 to 30 kHz. An excavation site is recommended after achieving the location of the temple.Īrchaeology, electromagnetics, inversion, Magnesia, VLF-R Introduction In addition to the inversion of all profiles for each frequency, all lines were stacked within a precise resistivity interval to obtain a 3D view of the structure. After performing theoretical studies to test the inversion algorithm, apparent resistivity and phase data were collected with three different frequencies and a laterally constrained two-layer inversion process was applied to each station. VLF-R studies were carried out in the Agora of Magnesia archaeological site (Aydın, Turkey) in order to determine the location and depth of ruins of the temple of Zeus.
It is also a particularly rapid and cost-effective technique for collecting data on large-scale exploration. Shallow buried structures that show resistivity variation with respect to a surrounding medium could be determined with VLF-R. Very low frequency wave-resistivity (VLF-R) method has been widely used for near surface and archaeological prospection over the last two decades.