Accession Number : ADA324486

Title :   Spectral Analysis and Moment Tensor Inversion of Seismic Events Induced in Polish Coal Mines: Search for Non-Shearing Components.

Descriptive Note : Final rept. 1 Jan-31 Dec 93,

Corporate Author : POLISH ACADEMY OF SCIENCES WARSAW

Personal Author(s) : Gibowicz, S. J. ; Niewiadomski, J. ; Wiejacz, P. ; Sagan, G. ; Zuberek, W.

PDF Url : ADA324486

Report Date : 28 FEB 1994

Pagination or Media Count : 230

Abstract : The investigations conducted under this contract are focused on a research for non-shearing components of the source mechanism of seismic events induced in Polish coal mines. Such seismic events are expected to occur in close vicinity to the mining faces, where favorable conditions for generation of tensile failures or shear failures with tensile components are present. Simultaneous application of spectral analysis of seismic waves and moment tensor inversion was used to study this problem. The ratio of P-wave to S-wave energy radiated from mine tremors is in many cases anomalously large, implying that non-shear failures are often generated by mining excavations. We expected to show that the high P-wave energy tremors are generated by the sources with prominent non-double-couple components, as estimated from the moment tensor solutions.

Descriptors :   *MINING ENGINEERING, *PRIMARY WAVES(SEISMIC WAVES), TENSILE STRESS, SEISMIC DETECTION, SEISMIC DATA, SHEAR STRESSES, EARTHQUAKES, PLATE TECTONICS, FAILURE(MECHANICS), SPECTRUM ANALYSIS, POLAND, SECONDARY WAVES, SEISMOGRAPHS, MINES(EXCAVATIONS), TREMORS.

Subject Categories : Seismology
      Mining Engineering

Distribution Statement : APPROVED FOR PUBLIC RELEASE