Record details

Title
    Analysis of state of stress during the 1997 earthquake swarm in Western Bohemia
Statement of responsibility
    Alice Slancová, Josef Horálek
Author
    Horálek, Josef
    Slancová, Alice
Language
    anglicky
Source title - serial
    Studia geophysica et geodaetica
Vol./nr.
    Roč. 44, č. 2
Pages
    s. 272-291
Year
    2000
Notes
    9 obr., 1 tab., 2 s.bibl.
    il.
    Zkr. název ser.: Stud. geophys. geod. (Praha)
Subject group
    granitoidy
    měření seizmické
    napětí
    ohniskový mechanismus
    podkrušnohorské pánve
    saxothuringikum
    sedimenty klastické
    seizmotektonika
    tlak orientovaný
    zemětřesný roj
Geographical name
    ČR-Čechy
    Nový Kostel (Cheb)
Keyword
    1997
    Analysis
    Bohemia
    During
    Earthquake
    State
    Stress
    Swarm
    Western
Abstract (in english)
   Focal mechanisms of 70 events of the January 1997 earthquake swarm were analysed using the Gephart and Forsyth method to determine the state of stress in the West Bohemia/Vogtland region and to reveal possible stress variations during the swarm activity. The method was applied to the whole set of 70 focal mechanisms and to several subsets distinguishing magnitudes ofevents and the spatial and temporal distribution of the swarm. The three representative stress models A (Ű1A: 0/45 (az/dip), Ű2A: 134/35, Ű3A: 243/25), B (Ű1B: 162/38, Ű2B: 263/14, Ű3B: 10/49), and C (Ű1C: 135/30, Ű2C:1/50, Ű3C:239/23) which coul characterise the state of stress in the region were found. Model C can be considered to tbe most probable stress model because of its consistency with the European stress field. The results of the stress analysis applied to the individual subsets of focal mechanisms indicate that the state of stress was more uniform during the first phase of the swarm.
   To distinguish between the fault plane and the auxiliary plane solutions a statistical approach was used. The results showed that the fault planes striking NW-SE dipping 45° to NE activated during the swarm
Contributor
    Česká geologická služba
Contributor code
    ČGS (UNM)
Source format
    U
Entered date
    31. 3. 2008
Import date
    8. 8. 2012