Geofyzikální ústav Akademie věd ČR, v.v.i.

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Theoretical modeling of the rock massif fracturing

Theoretical modeling of fracturing the rock massif

 

It is the mechanism – a hypothetic force system equivalent to the intrinsic physical process, which reports about the mode of fracturing in the focus of a seismic event. Vast majority of natural earthquakes corresponds to a shear-slip along a fault plane, which mechanism is a double couple (DC) in an isotropic medium. A more general process is indicated by a complex mechanism described by a complete moment tensor. Therefore, retrieval of moment tensors is a tool for approaching the physics of the process acting in the focus of a seismic event.

 

In particular, at present we are active in:

  • Development of robust methods of inversion of waveforms and amplitudes of seismic phases for retrieval of complete moment tensor (MT)
  • Design of methods of estimation of errors of the MT and its decomposition (isotropic-volumetric part, DC, compensated linear-vector dipole): Šílený 2009
  • Transformation of the error in data (ambient noise, phase contamination), hypocenter location error and mismodeling error into the uncertainty in the MT determination
  • Interpretation of non-DC components of the MT: Vavryčuk, 2015
  • Moment tensor at a material interface: Vavryčuk, 2013
  • Second degree moments of the source as a tool for estimation of source finitness: Adamová and Šílený, 2010, Adamová and Šílený, 2013
  • Joint inversion for stress and fault orientation: Vavryčuk, 2014

The methods developed are being applied to:

Members of the team:

Petra Adamová
Tomáš Fischer
Josef Horálek
Zuzana Jechumtálová
Petr Kolář
Jan Šílený
Václav Vavryčuk