Moment tensors of mining tremors: detection tool of the mode of rock-mass fracturing

0372605 - GFÚ 2012 RIV NL eng C - Conference Paper (international conference)
Šílený, Jan
Moment tensors of mining tremors: detection tool of the mode of rock-mass fracturing.
Third passive seismic workshop Actively Passive! Workshop proceedings. Houten: EAGE, 2011, s. 6-10. ISBN 978-90-73834-05-7.
[Passive seismic workshop Actively Passive! /3./. Athens (GR), 27.03.2011-30.03.2011]
R&D Projects: GA ČR GA205/09/0724
Institutional research plan: CEZ:AV0Z30120515
Keywords : mechanism of seismic event * resolution of double-couple and non-double-couple components
Subject RIV: DC - Siesmology, Volcanology, Earth Structure

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.
Permanent Link: http://hdl.handle.net/11104/0205878