Geodetic estimations of the modern motions on Tien Shan
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Інститут геофізики ім. С.I. Субботіна НАН України
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| Zitieren: | Geodetic estimations of the modern motions on Tien Shan / S. Kuzikov // Геофизический журнал. — 2010. — Т. 32, № 4. — С. 80-81. — Бібліогр.: 4 назв. — англ. |
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irk-123456789-1017562016-06-07T03:02:38Z Geodetic estimations of the modern motions on Tien Shan Kuzikov, S. 2010 Article Geodetic estimations of the modern motions on Tien Shan / S. Kuzikov // Геофизический журнал. — 2010. — Т. 32, № 4. — С. 80-81. — Бібліогр.: 4 назв. — англ. 0203-3100 http://dspace.nbuv.gov.ua/handle/123456789/101756 en Геофизический журнал Інститут геофізики ім. С.I. Субботіна НАН України |
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Digital Library of Periodicals of National Academy of Sciences of Ukraine |
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English |
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Article |
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Kuzikov, S. |
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Kuzikov, S. Geodetic estimations of the modern motions on Tien Shan Геофизический журнал |
| author_facet |
Kuzikov, S. |
| author_sort |
Kuzikov, S. |
| title |
Geodetic estimations of the modern motions on Tien Shan |
| title_short |
Geodetic estimations of the modern motions on Tien Shan |
| title_full |
Geodetic estimations of the modern motions on Tien Shan |
| title_fullStr |
Geodetic estimations of the modern motions on Tien Shan |
| title_full_unstemmed |
Geodetic estimations of the modern motions on Tien Shan |
| title_sort |
geodetic estimations of the modern motions on tien shan |
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Інститут геофізики ім. С.I. Субботіна НАН України |
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2010 |
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http://dspace.nbuv.gov.ua/handle/123456789/101756 |
| citation_txt |
Geodetic estimations of the modern motions on Tien Shan / S. Kuzikov // Геофизический журнал. — 2010. — Т. 32, № 4. — С. 80-81. — Бібліогр.: 4 назв. — англ. |
| series |
Геофизический журнал |
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AT kuzikovs geodeticestimationsofthemodernmotionsontienshan |
| first_indexed |
2025-07-07T11:21:38Z |
| last_indexed |
2025-07-07T11:21:38Z |
| _version_ |
1836986976327172096 |
| fulltext |
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Geodetic estimations of the modern motions
on Tien Shan
S. Kuzikov, 2010
Scientific Station, RAS, Bishkek, Kyrgyzstan
ksi@gdirc.ru
We can obtain information about formation and
a posterior transformation of crust, in particular, from
geological and structurally-tectonic researches or
maps. More often we have only final result of change
of geological objects and we do not know how this
result has been reached in the course of time. Ab-
sence of such data has led to occurrence of ex-
treme opinions about mode of intra-continental de-
formation of lithosphere. According to one of them,
the prevailing part of movements realize through sli-
ding of blocks on faults [e. g., Peltzer, Saucier,
1996; Replumaz, Tapponnier, 2003]. The alternative
notion is based on the prevalence of plastic defor-
mations and properties of a nonlinear-viscous liquid
in crust [e. g., Flesch et al., 2001]. Long time the
Research station of RAS (RS RAS) realizes geo-
detic researches of different scale, which allow to
estimate quantitatively modern near-surface move-
ments of Tien Shan crust and partially to under-
stand the geodynamic problem designated above.
In Central Asia the regional GPS researches are
in progress from 1992, by present time ~550 sites
of periodic measurement are dispersed on ~1.7 mil-
lion km2 in territory of Kyrgyzstan, Kazakhstan,
Uzbekistan, Tajikistan and China. The kinematic-
statistical analysis of horizontal velocities measured
for last 10—15 years, testifies about presence here
quasi-rigid areas of crust (domains) in the size from
~30 50 to ~600 800 km2 in which modern velocity
of deformation is negligibly small [Kuzikov, Mu-
khamediev, 2010]. The inter-domain space (IDS)
separate the quasi-rigid domains (QRD). IDS has
width from first km to several hundreds km, in which
velocity of displacement (to ~10 mm/year) can con-
siderably exceed deviations from rigid whole in QRD
(on the average — 0.35 mm/year). Total area of QRD
concedes a little of IDS territory as ~46 and ~54 %
accordingly. In structure of IDS the spatially-kine-
matical regularity in 4 steady directions is alloca-
ted: NE (on the average ~54 ) has left-hand compo-
nent of shift; Latitudinal (~88 ) has mainly cross-
section shortening; SE (~116 ) has elements of the
right-hand shift; Meridional (~165 ) has cross-sec-
tion extension. The spatial analysis has shown ab-
sence of correlation between modern IDS and the
active faults of Tien Shan, though on separate seg-
ments spatial and kinematic coincidence can be
found. Thus, within IDS there can be both displace-
ment on planes of faults, and elastic and-or plastic
deformations.
In ~20—25 km to the southeast from Bishkek,
in foothills of the Kirghiz range, RS RAS perform
regular (1 time in 2 weeks) linear-angular (tacheo-
metric) measurements from 2006 for detailed study-
ing of deformation variations on 2 local sites. Ta-
cheometric researches are combined with geodetic
levelling, GPS measurements and other geophysi-
cal works. Each of these local sites occupies less
then 0.75 km2 and between them of ~5 km in direc-
tion W-E. Measured baselines between fundamen-
tal geodetic benchmarks have length from ~150 to
~1400 m. Since December 2007 to April 2008 on
both local sites some northern benchmarks were
anomalously displaced and then have returned al-
most on former places. Maximums of change of
lengths on both local sites are fixed to the middle of
March 2008 and have on a longitude ~ 18 mm on
~403 m (~ 4.5 10 5) and on latitude ~14 mm on
~150 m (~9.3 10 5). Thus, there was synchronous
and approximately identical size of an elastic defor-
mation for northern parts of the two local sites re-
moved from each other on ~5 km. Probably, it is
result of influence of neotectonic thrust located in
~500—1000 m to the north.
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Approximately in the same area foothills of the
Kirghiz range two profiles of northern directions have
lengths ~14 and ~17 km for tacheometric observa-
tions on fundamental geodetic benchmarks are lo-
cated. Since 1992 to 2009 on some segments of
these profiles are lengthening and shortening the
baselines with linear deformations to |~6.8 10 5| on
~115 m and more. On some segments of profiles
the change of directions of linear deformation is
observed. The movements on some base lines it is
possible to explain by displacement on planes of
neotectonic faults, however on more base lines have
elastic and plastic deformations, most likely.
At building of the dam by powerful explosion (~3
thousand tone of an explosive) has been made for
the hydropower station Kambarata-2 on the river
Naryn (near of Toktogulsky water-storage basin) on
December, 22nd 2009. There was a probability of
motions on the fault located in ~ of 300—500 m
from epicenter of explosion. RS RAS exercised the
geophysical observations within 2 days before ex-
plosion, during day of explosion and 2 days after.
During this time 8 GPS stations on 4 sites exer-
cised the continuous measurements around the
explosion epicenter on distance from ~1.4 to
~5.3 km. As have shown the GPS data at daily ave-
raging, almost on all investigated base lines imme-
diately after explosion the increase in distances on
0.6—1.6 mm (on the average — 1.1 mm) was ob-
served. Next day after explosion the same base
lines have decreased on 0.2—0.9 mm (on the ave-
rage — 0.5 mm). By the end of measurements the
minimum of measured lengths of base lines for all
time of supervision has been reached. Thus, around
of epicenter there was elastic stretching immedia-
tely after explosion which after was replaced with
shortening of all base lines as a result on 0.4—
2.3 mm (on the average ~1.4 mm). Thus, the po-
werful industrial explosion has not essential influ-
ences on displacement of crust around hydropower
station Kambarata-2.
Flesch L. M., Haines A. J., Holt W. E. Dynamics of
the India-Eurasia collision zone // J. Geophys. Res.
— 2001. — 106 (B). — P. 16,435—16,460.
Kuzikov S. I., Mukhamediev Sh. A. Structure of the
Present-Day Velocity Field of the Crust in the Area
of the Central-Asian GPS Network // Izv. Physics of
the Solid Earth. — 2010. — 46, ���7. — P. 584—
601.
Peltzer G., Saucier F. Present-day kinematics of Asia
derived from geologic fault rates // J. Geophys. Res.
— 1996. — 101 (B). — P. 27,943—27,956.
Replumaz A., Tapponnier P. Reconstruction of the
deformed collision zone between India and Asia by
backward motion of lithospheric blocks // J. Geo-
phys. Res. — 2003. — 108 (B6). — P. 2285. —
DOI: 10.1029/2001JB000661.
References
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