Podrobnosti záznamu

Název
    The Influence of the Core-mantle Boundary Irregularities on the Mass Density Distribution Inside the Earth
Údaj o odpovědnosti
    Zdeněk Martinec, Karel Pěč
Autor
    Martinec, Zdeněk
    Pěč, Karel
Jazyk
    anglicky
Zdrojový dokument - monografie
    Geophysical Data Inversion Methods and Applications: Proceedings of the 7th International Mathematical Geophysics Seminar held at the Free University of Berlin, February 8-11, 1989
Strany
    s. 233-256
Poznámky
    7 obr., 2 s.bibl.
    il.
    Theory and Practice of Applied Geophysics 4
Předmětová skupina
    anomálie tíhová
    gravimetrie
    izostáze
    kůra zemská
    modelování
    obrácená úloha
    plášť
    pole gravitační
    vrstva mezní
Geografické jméno
    Země
Klíčové slovo
    Boundary
    Core-mantle
    Density
    Distribution
    Earth
    Influence
    Inside
    Irregularities
    Mass
Abstrakt (anglicky)
   Models of the 3-D mass density variation inside the Earth have been derived for two models of the core-mantle boundary (henceforth referred as CMB): an oblate spheroid and a laterally varying relief. The derived density models significantly differ in mass density compensation. The density model with the CMB modelled as an oblate spheroid fulfils the hypothesis of isostatic compensation, but it does not explain the large-scale dynamic processes in the mantle. The latter model with the aspherical CMB also admits, besides the isostatic compensation in the upper mantle, downgoing and upgoing mass transport in the lower mantle by laterally varying density. This "dynamic" compensation is in a full agreement with the hypothesisof mantle convection.
   Furthermore, the density perturbations under subduction zones show the penetration of downwelling slabs into the lower mantle, which means that a model of whole mantle convection is favored over stratified convenction divided by sharp chemical boundary near the 650-km discontinuity
Přispěvatel
    Česká geologická služba
Kód přispěvatele
    ČGS (UNM)
Zdrojový formát
    U
Datum vložení
    3. 4. 2008
Datum importu
    8. 8. 2012