Record details

Title
    Moment tensors of mining tremors: detection tool of the mode of rock-mass fracturing
Author
    Šílený, Jan
Conference
    Passive seismic workshop Actively Passive! (3. : 27.03.2011-30.03.2011 : Athens, Řecko)
Language
    anglicky
Publication type
    konferenční příspěvek (zahraniční konference)
Source title - monograph
    Third passive seismic workshop Actively Passive! Workshop proceedings
Pages
    S. 6-10
Notes
    Projekt: GA205/09/0724, GA ČR3cav_un_auth*0252832
    Rozsah: 5 s.
    Výzkumný záměr: CEZ:AV0Z30120515
Subject category
    mechanism of seismic event
    resolution of double-couple and non-double-couple components
Keyword
    Detection
    Fracturing
    Mining
    Mode
    Moment
    Rock-mass
    Tensors
    Tool
    Tremors
Abstract (in english)
   Traditional view about seismic events as exclusively shear slip phenomena has changed during recent decades. Advanced instrumentation and monitoring provide data which indicate events not matched by a simple double couple (DC). While earthquakes, in particular the strong events, are commonly assumed as shear slips, in foci of mining tremors physically a more complex mechanism may be expected due to injuring the rock mass by mine cavities concentrating the ambient stress. The mechanism in the moment tensor (MT) representation is an important discrimination instrument. To develop it into a reliable tool it is however vital to assess properly errors in the MT retrieval, particularly in the non-DC component determination, which is vulnerable to deterioration of the quality of records, station distribution, event location and velocity modeling.
Contributor
    AV ČR Brno, Geofyzikální ústav
Contributor code
    AV ČR, GFÚ
Source format
    U
Import date
    9. 12. 2013