10. PRESENT NETWORK
The entire methodology was developed by analyzing
data, which refer to the Earth’s electric field variations and were
acquired by the following monitoring sites and correspond on 5
different periods of time:
1. Time period: 20th June 1999 to 17th September 2000.
During this period of time, a single dipole (VOL) was installed in
the area of Volos, Greece. Its length was 120m and of almost N-S
direction. The used electrodes were the metal casings of two
boreholes. The initial recordings were made with a resolution of +/-
2. Time period: 2nd November 2000 to 27th September
2002. During this period of time, at the monitoring site a second
dipole, of similar length, was installed and of almost E-W
direction. Technical details and preseismic, electrical signals,
recorded by Volos (VOL) monitoring site, were presented by Thanassoulas and Tsatsaragos (2000).
The location of Volos (VOL) monitoring site is presented in the
following figure (10.1).
Fig. 10.1. VOL monitoring
site location (green lettering) is presented in relation
to the lithospheric, deep fracturing (gray thick lines)
and seismic, potential map of Greece (2003).
Unfortunately, my collaboration with Mr. Tsatsaragos ended on 27th
September 2002 for reasons beyond my control. Therefore, there is a
time period that follows, for which no data are available at all.
Registrations of the Earth’s electric field commenced again as
3. Time period: 15th April, 2003 till present time
(June 2007). Athens (ATH) monitoring site was installed and is in
4. Time period: 23rd May, 2003 till present time (June
2007). Pyrgos (PYR) monitoring site was installed and is in
5. Time period: 18th March, 2006 till present time
(June 2007). Hios (HIO) monitoring site was installed and is in
The locations of Athens (ATH), Pyrgos (PYR) and Hios (HIO)
monitoring sites are presented in the following figure (10.2).
PYR, ATH, HIO monitoring sites locations (blue
lettering) in relation to the lithospheric, deep,
fracturing (gray thick lines) and seismic, potential map
The limited number of the installed monitoring sites is due to the
- It is difficult and time consuming to find a private
volunteer to assist the installation and operation of each
monitoring site, at the preselected areas.
- All expenses which were required for the installation
of each monitoring site were paid by private, financial
contributions, made, by the research team (Dr. Thanassoulas and Mr. Klentos).
- Hardware implementation, software design and computer
packages construction (periods 3, 4, 5) were implemented by Dr. Thanassoulas, C. and Klentos, V.
In general, there is no financial support by any kind of source and
the appropriate, technical personnel which is needed, for the
installation and to keep, smoothly, running a decent, monitoring
network, is missing, too.
At this point, I would like to express my thanks to the operators
of the two monitoring sites, in Pyrgos (PYR, Mr. Verveniotis, G.)
and in Hios Island (HIO, Mr. Zymaris, N.) for running these sites
completely voluntarily and gratis.
Nevertheless, the current network permitted us to come into serious
conclusions about the specific, postulated methodology.