High resolution study of temporal variations of induction vectors
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| Published in: | Геофизический журнал |
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| Date: | 2010 |
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Інститут геофізики ім. С.I. Субботіна НАН України
2010
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| Cite this: | High resolution study of temporal variations of induction vectors / T. Klymkovych, I. Rokityansky, Yu. Horodysky, A. Isac // Геофизический журнал. — 2010. — Т. 32, № 4. — С. 66-67. — Бібліогр.: 7 назв. — англ. |
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Klymkovych, T. Rokityansky, I. Horodysky, Yu. Isac, A. 2016-06-03T09:05:07Z 2016-06-03T09:05:07Z 2010 High resolution study of temporal variations of induction vectors / T. Klymkovych, I. Rokityansky, Yu. Horodysky, A. Isac // Геофизический журнал. — 2010. — Т. 32, № 4. — С. 66-67. — Бібліогр.: 7 назв. — англ. 0203-3100 https://nasplib.isofts.kiev.ua/handle/123456789/101387 en Інститут геофізики ім. С.I. Субботіна НАН України Геофизический журнал High resolution study of temporal variations of induction vectors Article published earlier |
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High resolution study of temporal variations of induction vectors |
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High resolution study of temporal variations of induction vectors Klymkovych, T. Rokityansky, I. Horodysky, Yu. Isac, A. |
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High resolution study of temporal variations of induction vectors |
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High resolution study of temporal variations of induction vectors |
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High resolution study of temporal variations of induction vectors |
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High resolution study of temporal variations of induction vectors |
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high resolution study of temporal variations of induction vectors |
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Klymkovych, T. Rokityansky, I. Horodysky, Yu. Isac, A. |
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Klymkovych, T. Rokityansky, I. Horodysky, Yu. Isac, A. |
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2010 |
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English |
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Геофизический журнал |
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Інститут геофізики ім. С.I. Субботіна НАН України |
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Article |
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0203-3100 |
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https://nasplib.isofts.kiev.ua/handle/123456789/101387 |
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High resolution study of temporal variations of induction vectors / T. Klymkovych, I. Rokityansky, Yu. Horodysky, A. Isac // Геофизический журнал. — 2010. — Т. 32, № 4. — С. 66-67. — Бібліогр.: 7 назв. — англ. |
| work_keys_str_mv |
AT klymkovycht highresolutionstudyoftemporalvariationsofinductionvectors AT rokityanskyi highresolutionstudyoftemporalvariationsofinductionvectors AT horodyskyyu highresolutionstudyoftemporalvariationsofinductionvectors AT isaca highresolutionstudyoftemporalvariationsofinductionvectors |
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2025-11-25T22:33:14Z |
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2025-11-25T22:33:14Z |
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High resolution study of temporal variations
of induction vectors
T. Klymkovych1, I. Rokityansky2, Yu. Horodysky1, A. Isac3, 2010
1Carpathian Branch of Institute of Geophysics, National Academy of Sciences of Ukraine, Lvov, Ukraine
tamara@cb-igph.lviv.ua
2Institute of Geophysics, National Academy of Sciences of Ukraine, Kiev, Ukraine
e-mail: rokityansky@gmail.com
3Institute of Geophysics of Romanian AS, Bucharest, Romania
margoisac@yahoo.com
The study of temporal variations of induction vec-
tors (C) has a long story [Chen, Fung, 1993; Kharin,
1982 and many others]. The companion paper [Ro-
kityansky et al., 2010] (see it for a notations and
introductory material) emphasizes on the impor-
tance of periodic variations study and presents cases
of annual variations. In [Klymkovych et al., 2007;
2009], new high resolution processing program has
been developed and applied to magnetic observato-
ry (MO) N. Selyshce data and periodic variations of
induction vector parameters have been obtained
both for annual and diurnal periods. In this work,
high resolution program is applied to the data of
MOs Surlari (some 30 km to SE from Vrancha zone
and Carpathian electrical conductivity anomaly,
Romania) and Dymer (40 km to North from Kiev,
NE slope of Ukrainian shield to Dnieper-Donetsk
Depression filled by sediments). We used 1 s digi-
tal data of three geomagnetic field components and
make their averaging over 10, 20, 30, 40 or 60 s to
receive input data for consequent processing.
2.5 years: 2008, 2009 and half of 2010 were pro-
cessed. At all three stations both diurnal and annu-
al variations are clearly seen on some of compo-
nents. In Dymer the dependence is most clear and
magnitude of annual variation attains 0.2 at the lon-
gest period 40—60 s at the northern component A,
at shorter periods annual variation presents at both
components. In Surlary annual variation is seen at
all periods except longest one. In Surlari several
monthly means behave as outliers that may be re-
lated with geodynamic processes in active Vran-
cha zone. Comparison with the earthquakes appea-
rance is in state of study.
The main body of our talk will be devoted to pre-
sentation of numerous graphs received at the tree men-
tioned observatories and their analysis and discus-
sion.
Diurnal variations are present at all three obser-
vatories and they mainly repeat the behavior of an-
nual ones. The day-time external sources differ from
night-time ones and both depend on geomagnetic
activity. Then diurnal variation of C can be (at least
partly) prescribed to change of the source parame-
ters. Controlled sources are free of that influence.
Dipole soundings in Central Asia and Baltic shield
with distance between transmitter and receiver from
10 to 1000 km measured diurnal apparent resistivi-
ty variation from 5 to 20 % closely correlated with
tides [Zhamaletdinov et al., 2004]. This controlled
source experiments prove that noticeable periodic
variations of transfer functions can have the tidal
nature Stress in the lithosphere active zones can
be several orders larger than tidal one. So geody-
namic processes shurely can give rise C variations.
We review cases of strong lithosphere emission
(ULF 0.01—10 Hz) of magnetic field before strong
earthquakes Spitak, Loma Prieta, Grevena-Kozani,
Biak, Chi-Chi with noticeable enhancement of verti-
cal component, and hence with variation of C.
In China dozens 3-component geomagnetic ob-
servatories monitor monthly mean induction vector
components |A| and |B|. Before and after strong EQs,
the components noticeable change. For example,
northern component |A| of induction vector for period
20min before M6.2EQ 10.01.1998 show half year evo-
lution with maxima 2 month before and during EQ [Zeng
et al., 2002]. And what is the most remarkable: the maxi-
mum �A| occur 400 km to ESE from epicenter, over
epicenter region no anomaly is observed (“selectivity”
effect). So, we can make the conclusion that response
function variations can be caused by lithospheric emis-
sion or by the change of conductivity or by both.
We are greatly thankful to staff and supervisors
of geomagnetic observatories Dymer N. Selishce
and Surlari for data used in this work.
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Chen P. F., Fung P. C. W. Time Changes in Geomag-
netic Transfer Functions at Lunping before and af-
ter the 1986 Hualian Earthquake [Ms=7.6] // J. Geo-
mag. Geoelectr. — 1993. — ���45. — P. 251—259.
Kharin E. P. Changes in transfer functions with time //
Geophys. Surveys. — 1982. — ���4. — P. 455—
466.
Klymkovych T� ����Horodyskyy Yu� ����Kuznetso-
va V� G���Maksymchuk V� Yu��Results�of�continu-
ous� investigations�of� induction vectors time chan-
ges in the seismoactive Transcarpathian trough //
Geodynamics. — 2007. — � 1. — P. 41—48 (in
Ukrainian).
Klymkovych T� ����Horodyskyy Yu� ����Kuznetso-
va V� G���Maksymchuk V� Yu� Studies of tempo-
ral changes of induction vectors parameters in the
References
Transcarpathian seismically active trough // Geo-
phys. J. — 2009. — 31, � 6. — P. 147—152 (in
Ukrainian).
Rokityansky I., Klymkovich T., Babak V., Savchen-
ko T. Periodic variations of induction vectors // Geo-
phys. J. — 2010. — 32,���4. — P. 139—143.
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