Record details

Title
    Time variations of absorption
Statement of responsibility
    Bohuslav Růžek
Author
    Růžek, Bohuslav
Language
    anglicky
Source title - serial
    Acta montana. Series A, Geodynamics
Vol./nr.
    No. 10(102)
Pages
    p. 39-51
Year
    1996
Notes
    1 obr., 7 diagr., 18 bibl.
    Zkr. název ser.: Acta montana (Praha), Ser. A.
Subject group
    absorpce vln
    kladensko-rakovnická pánev
    monitoring
    těžba podzemní
    uhlí bituminózní
    vlny P
    vlny S
    zemětřesení indukované
Geographical name
    ČR-Čechy
    Kladno
Keyword
    Absorption
    Time
    Variations
Abstract (in english)
   A file containing several thousands of seismograms of induced seismic events originating during black coal exploitation in the Mayrau deep mine, Czech Republic, was processed in order to determine zthe value of absorption. A simple method utilizing the ratio of P and S waves power spectra was tested. The total time period taken into consideration exceedsone year. Significant temporal and spatial variations in absorption were detected. These variations are supposed to be caused by stress changes induced by mining. The mean value of shear waves absorption was determined as Qs=40. The method is recommended for the purpose of monitoring the state of the rock massif being mined
Contributor
    Česká geologická služba
Contributor code
    ČGS (UNM)
Source format
    U
Entered date
    25. 3. 2008
Import date
    8. 8. 2012