Stress modeling in the Central Asia crust, importance of gravity stresses
Збережено в:
| Опубліковано в: : | Геофизический журнал |
|---|---|
| Дата: | 2010 |
| Автори: | , , |
| Формат: | Стаття |
| Мова: | Англійська |
| Опубліковано: |
Інститут геофізики ім. С.I. Субботіна НАН України
2010
|
| Онлайн доступ: | https://nasplib.isofts.kiev.ua/handle/123456789/103100 |
| Теги: |
Додати тег
Немає тегів, Будьте першим, хто поставить тег для цього запису!
|
| Назва журналу: | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| Цитувати: | Stress modeling in the Central Asia crust, importance of gravity stresses / V. Pogorelov, A. Baranov, R. Alekseev // Геофизический журнал. — 2010. — Т. 32, № 4. — С. 131. — Бібліогр.: 2 назв. — англ. |
Репозитарії
Digital Library of Periodicals of National Academy of Sciences of Ukraine| _version_ | 1860242761663381504 |
|---|---|
| author | Pogorelov, V. Baranov, A. Alekseev, R. |
| author_facet | Pogorelov, V. Baranov, A. Alekseev, R. |
| citation_txt | Stress modeling in the Central Asia crust, importance of gravity stresses / V. Pogorelov, A. Baranov, R. Alekseev // Геофизический журнал. — 2010. — Т. 32, № 4. — С. 131. — Бібліогр.: 2 назв. — англ. |
| collection | DSpace DC |
| container_title | Геофизический журнал |
| first_indexed | 2025-12-07T18:31:59Z |
| format | Article |
| fulltext |
������������������ !�"�#$�%&�'�$��(�( �'�
)*� ��+,�*-�.
��,������/
�*
��.,�.��.���*������ �����
��
Stress modeling in the Central Asia crust, importance
of gravity stresses
V. Pogorelov, A. Baranov, R. Alekseev, 2010
Laboratory of Theoretical Geodynamics, Institute of Physics of the Earth, RAS, Moscow, Russia
vpogorelov@list.ru,
baranov@ifz.ru
The Southern and Central Asia is a tectonically
complex region which characterized by the great
collision between the Asian and Indian plates. Its
tectonic evolution is strongly related to the active
subduction process along the Pacific border. Stress
investigation in the continental crust is a very im-
portant problem not only for science but also for the
practical purposes. There are four main factors which
produce tectonic stresses: gravity anomalies of the
crust, density inhomogeneities, deformation from
area with intraplate collision, residual elastic defor-
mations and underthrust stresses conditions from
convective mantle. We present the stress model of
the crust and lithosphere for the Central and Sou-
thern Asia on the basis of the finite element mode-
ling. For the crust we take the elasto-plastic rheol-
ogy with Drucker-Prager criterion. In the lithosphere
the elasto-plastic model with von Mises criterion is
assumed. We investigated stresses which are pro-
duced by the crustal density inhomogeneities and
surface relief. The calculations are done using the
U-WAY finite element code [Vlasov et al., 2004]
developed at the Institute of Applied Mechanics
Russian Academy of Sciences (similar to the Nas-
tran program). Density inhomogeneities are based
on the AsCRUST-08 crustal model [Baranov, 2010],
which has resolution of 1 1 degree. AsCRUST-08
was built using the data of deep seismic reflection,
refraction and receiver functions studies from pub-
lished papers. The complex 3D crustal model con-
sists of three layers: upper, middle, and lower crust.
Besides depth of the boundaries, we provided ave-
rage P-wave velocities in the upper, middle and lower
parts of the crystalline crust and sediments. The seis-
mic P-velocity data was also recalculated to the den-
sities and the elastic moduli of the crustal layers
using the rheological properties and geological con-
straints. Strength parameters of rocks strongly de-
pend on temperature, tectonic and fluid pressure. Flu-
id pressure can reduce resistance forces in faulting
rock, tectonic pressure increases these forces.
Results. Isotropic pressure in crustal layer is
approximately equal to 0.6—0.8 from lithostatic va-
lues, for example 900 MPA on the 40 km depth
(Poisson ration changes in the crustal layer from
0.25 to 0.32 in accordance to its mineral proper-
ties). In the mantle isotropic pressure practically
equals to lithostatic values which corresponds to
Poisson ratio 0.5. Lateral pressure variations in the
crustal layer are limited by 10—15 % (negative pres-
sure anomaly under Tibet orogen reaches 15 %).
Shear stresses gradually increase with depth and
reach approximately 650 MPA in the lower crust
under Tibet orogen and 300 MPA on the 30km depth.
The models in this work are simplified in several
aspects. However our purpose was to compare gra-
vity stresses in the normal continental crust and
under Tibet orogen with anomaly thick crustal lay-
er.
References
Baranov A. A. A New Model of the Earth’s Crust in Cen-
tral and South Asia // Izvestiya. Physics of the Solid
Earth. 2010. — 46, � 1. — P. 34—46.
Vlasov A. N., Yanovsky Yu. G., Mnushkin M. G., Po-
pov A. A. Solving geomechanical problems with
UWay FEM package // Computational Methods in
Engineering and Science / Ed. V. P. Iu. — Potsdam:
Taylor & Francis, 2004. — P. 453—461.
|
| id | nasplib_isofts_kiev_ua-123456789-103100 |
| institution | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| issn | 0203-3100 |
| language | English |
| last_indexed | 2025-12-07T18:31:59Z |
| publishDate | 2010 |
| publisher | Інститут геофізики ім. С.I. Субботіна НАН України |
| record_format | dspace |
| spelling | Pogorelov, V. Baranov, A. Alekseev, R. 2016-06-13T15:56:06Z 2016-06-13T15:56:06Z 2010 Stress modeling in the Central Asia crust, importance of gravity stresses / V. Pogorelov, A. Baranov, R. Alekseev // Геофизический журнал. — 2010. — Т. 32, № 4. — С. 131. — Бібліогр.: 2 назв. — англ. 0203-3100 https://nasplib.isofts.kiev.ua/handle/123456789/103100 en Інститут геофізики ім. С.I. Субботіна НАН України Геофизический журнал Stress modeling in the Central Asia crust, importance of gravity stresses Article published earlier |
| spellingShingle | Stress modeling in the Central Asia crust, importance of gravity stresses Pogorelov, V. Baranov, A. Alekseev, R. |
| title | Stress modeling in the Central Asia crust, importance of gravity stresses |
| title_full | Stress modeling in the Central Asia crust, importance of gravity stresses |
| title_fullStr | Stress modeling in the Central Asia crust, importance of gravity stresses |
| title_full_unstemmed | Stress modeling in the Central Asia crust, importance of gravity stresses |
| title_short | Stress modeling in the Central Asia crust, importance of gravity stresses |
| title_sort | stress modeling in the central asia crust, importance of gravity stresses |
| url | https://nasplib.isofts.kiev.ua/handle/123456789/103100 |
| work_keys_str_mv | AT pogorelovv stressmodelinginthecentralasiacrustimportanceofgravitystresses AT baranova stressmodelinginthecentralasiacrustimportanceofgravitystresses AT alekseevr stressmodelinginthecentralasiacrustimportanceofgravitystresses |