Distribution of elastic parameters in the Earth’s core
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| Дата: | 2010 |
|---|---|
| Автор: | |
| Формат: | Стаття |
| Мова: | English |
| Опубліковано: |
Інститут геофізики ім. С.I. Субботіна НАН України
2010
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| Назва видання: | Геофизический журнал |
| Онлайн доступ: | http://dspace.nbuv.gov.ua/handle/123456789/101213 |
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| Назва журналу: | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| Цитувати: | Distribution of elastic parameters in the Earth’s core / V. Burmin // Геофизический журнал. — 2010. — Т. 32, № 4. — С. 26-28. — англ. |
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Distribution of elastic parameters in the Earth’s core
V. Burmin, 2010
Institute of Physics of the Earth, RAS, Moscow, Russia
burmin@ifz.ru
The travel-time curves of refracted and reflected
short-longitudinal seismic waves propagating in the
Earth’s core were constructed by record-sections
of seismic vibrations from deep earthquakes recor-
ded by the global network. These travel-time ob-
tained velocity section core, in good agreement with
observed data. The velocity curve for the Earth’s core
is well explain the nature of the so-called «precur-
sors» — vibrations that go in the first arrival in the
Earth’s surface at epicentral distances of 134—142 .
Features velocity section of the outer core is the
presence of his bottom of the layer thickness of
about 500 km from the high positive velocity gradi-
ent and immediately beneath a low-velocity layer
thickness of about 200 km (zone F). In the inner
core velocity first increases rather strongly to a depth
of approximately 5500 km, and then to the center
of the Earth varies almost linearly, with a slightly
higher gradient than is usual in the standard model.
Density, elastic parameters and viscosity of the
Earth’s core were obtained on the basis of velocity
curve for the longitudinal seismic waves. The densi-
ty distribution for the new model differs from the dis-
tribution obtained in the standard model PREM only
in the inner core. Distributions of modulus and shear
modulus, depending on the physical processes
occurring inside the Earth, may have a different cha-
racter. In particular, the bulk modulus can have a
negative jump at the boundary of the outer and in-
ner core of the Earth, and the shear modulus may
be different from zero at the bottom of the outer core.
It is concluded that the shear modulus in the bot-
tom of the outer core to fluctuations in the order of
1 Hz should be different from zero, and reach va-
lues of ~2 1012 Pa. This conclusion is based on the
fact that the gradient of the velocity of longitudinal
waves in the lower outer core increases and the
assumption that the bulk modulus in the core is a
monotonic function. Estimates of the coefficient of
shear viscosity for the outer and inner core have
been made. These estimates imply that in the outer
core directly adjacent to the upper boundary of the
outer core viscosity is low, which corresponds to
the liquid state of matter in the Earth’s core. As we
move to the lower boundary of the outer core vis-
cosity increases, and the substance goes into the
vitreous state. Low viscosity, apparently, takes place
at the bottom of the outer core in zone F.
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| spelling |
irk-123456789-1012132016-06-02T03:02:26Z Distribution of elastic parameters in the Earth’s core Burmin, V. 2010 Article Distribution of elastic parameters in the Earth’s core / V. Burmin // Геофизический журнал. — 2010. — Т. 32, № 4. — С. 26-28. — англ. 0203-3100 http://dspace.nbuv.gov.ua/handle/123456789/101213 en Геофизический журнал Інститут геофізики ім. С.I. Субботіна НАН України |
| institution |
Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| collection |
DSpace DC |
| language |
English |
| format |
Article |
| author |
Burmin, V. |
| spellingShingle |
Burmin, V. Distribution of elastic parameters in the Earth’s core Геофизический журнал |
| author_facet |
Burmin, V. |
| author_sort |
Burmin, V. |
| title |
Distribution of elastic parameters in the Earth’s core |
| title_short |
Distribution of elastic parameters in the Earth’s core |
| title_full |
Distribution of elastic parameters in the Earth’s core |
| title_fullStr |
Distribution of elastic parameters in the Earth’s core |
| title_full_unstemmed |
Distribution of elastic parameters in the Earth’s core |
| title_sort |
distribution of elastic parameters in the earth’s core |
| publisher |
Інститут геофізики ім. С.I. Субботіна НАН України |
| publishDate |
2010 |
| url |
http://dspace.nbuv.gov.ua/handle/123456789/101213 |
| citation_txt |
Distribution of elastic parameters in the Earth’s core / V. Burmin // Геофизический журнал. — 2010. — Т. 32, № 4. — С. 26-28. — англ. |
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Геофизический журнал |
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