Record details

Title
    Iterative joint inversion for stress and fault orientations from focal mechanisms
Author
    Vavryčuk, Václav
Language
    anglicky
Publication type
    článek v odborném periodiku
Source title - serial
    Geophysical Journal International
Vol./nr.
    Roč. 199, č. 1
Pages
    s. 69-77
Year
    2014
Notes
    doplnit UT ISI
    Projekt: GAP210/12/1491, GA ČR, CZ3cav_un_auth*0285048
    Rozsah: 11 s. : P
Subject category
    earthquake source observations
    seismicity and tectonics
    theoretical seismology
Keyword
    Fault
    Focal
    Inversion
    Iterative
    Joint
    Mechanisms
    Orientations
    Stress
Abstract (in english)
   Stress inversions from focal mechanisms require knowledge of which nodal plane is the fault. If such information is missing, and faults and auxiliary nodal planes are interchanged, the stress inversions can produce inaccurate results. It is shown that the linear inversion method developed by Michael is reasonably accurate when retrieving the principal stress directions even when the selection of fault planes in focal mechanisms is incorrect. However, the shape ratio is more sensitive to the proper choice of the fault and substituting the faults by auxiliary nodal planes introduces significant errors. This difficulty is removed by modifying Michael's method and inverting jointly for stress and for fault orientations. The fault orientations are determined by applying the fault instability constraint and the stress is calculated in iterations.
Contributor
    AV ČR Brno, Geofyzikální ústav
Contributor code
    AV ČR, GFÚ
Source format
    U
Import date
    23. 10. 2014