 |
| Titel |
The Model of Own Seismoelectromagnetic Oscillations of LAI System |
| VerfasserIn |
Manana Kachakhidze, Zurab Kereselidze, Nino Kachakhidze |
| Konferenz |
EGU General Assembly 2010
|
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 12 (2010) |
| Datensatznummer |
250035405
|
|
|
|
|
|
| Zusammenfassung |
| Very low frequency (VLF) electromagnetic radiation (in diapason 1 kHz – 1MHz) in
atmosphere, generated during earthquake preparation period, may be connected
with linear size, characterizing incoming earthquake source. In order to argue this
hypothesis very simple quasi-electrostatic model is used: local VLF radiation may be the
manifestation of own electromagnetic oscillations of concrete seismoactive segments of
lithosphere-atmosphere system. This model explains qualitatively well-known precursor
effects of earthquakes. At the same time, it will be principally possible to forecast expected
earthquake with certain precision if we use this model after diagnosing existed
data.
As physical basis of working hypothesis is atmospheric effect of polarization charges
occurred in surface layer of the Earth, it is possible to test the below constructed model in
medium, where reasons of polarization charge generation may be different from piezoelectric
mechanism, for example, due to electrolytic hydration.
It is known that in the period of earthquake preparation piezo-electric effect, caused by
mechanical stresses, is observed in rocks. Generally, polarization charge should be
distributed on a surface, which should be either limited by fault or formed along
faults.
According to the model, in source area of incoming earthquake, at the final stage of its
preparation, against a background of numerous fractures, definite, linear size main fault is
being formed. So it can be represented as linear wire, the length of which considerably
exceeds characteristic size of its section. Conductor of the same size but with opposite
polarity should occur in the atmosphere by induction. It is obvious that such model is inverse
or it can be assumed that initial conductor is in the atmosphere and secondary or induced one
is in the lithosphere.
When electromagnetic dissipation is disregarded, circuit’s (contour’s) own oscillation
frequency is defined by well-known Tompson’s formula:
Ï2 = -1---
L -
C
(1)
Let’s say that the length of horizontal, opposite polarity conductors is l, characteristic
quantity conductor’s section is a, distance between conductors is h. It is known that inter
capacity of conductors, when h >> a,is:
C - -ÏÉ(0)l
ln ha
and mutual induction of conductors L -μ0
-Ï ln(h)
al (it is assumed that relative electric and
magnetic constants É = μ = 1 ).
Thus, from (1) formula of circuit’s own electromagnetic oscillations we’ll have
( )- 1 c
Ï = É0μ0l2 2 = l
(2)
where c is velocity of light. Let’s assume that l changes in (1-100) km interval, which
corresponds to change diapason of characteristic scale of earthquake source. From (1) we’ll
receive that change diapason of analogous circuit’s own electromagnetic oscillation
frequency is Ï=3 (103 - 105) Hz. So it is obvious quantitative agreement with often recorded
very low frequency atmospheric electromagnetic radiation spectrum in earthquake
preparation period.
Quasi-electrostatic model presented by us, may become as physical basis of
electromagnetic coupling into LAI system. It vary simply explains qualitatively possible
results of induction effects in the lithosphere, as well as in the atmosphere and the ionosphere
during earthquake preparation process. |
|
|
|
|
|
|