Geoscience Reference
In-Depth Information
TEC disturbance, %
60
0
−
25
−
25
15
−
15
0
15
25
15
30
0
−
25
−
15
−
35
0
−
15
0
15
25
15
−
30
0
15
−
15
−
−
60
60
90
120
150
180
210
240
Magnetic longtitude (deg . )
23.06.1986
11:00 UT
H=175 km
Fig. 4.14
Model-calculated relative total electron content (TEC) disturbances (%) induced by the
additional (seismogenic) sources for two earthquake epicenters indicated by the markers
f
0
F2, MHz
Quiet
16
Disturbed
(5 kv)
Disturbed
(2 kv)
Earthquake
epicentre
14
12
10
8
6
4
2
−
60
−
30
0
30
60
Magnetic latitude, deg
Fig. 4.15
Model calculated latitudinal variations of the F2 layer critical frequencies along the
magnetic meridian of the equatorial earthquake epicenter located at 15
ı
magnetic latitude for quiet
and disturbed conditions
origin electric field potential has been proposed. For the existence of an eastward
electric field in the near-epicentral area, it is necessary to dispose positive electric
charges on the western boundary and negative charges on the eastern boundary
of this area. However, we did not discuss the mechanism of the generation of a
seismogenic electric field, and we did not explain why the positive charges should
