Determination of Source Time Function of Mining-Induced Seismic Events by the Empirical Green's Function Approach

摘要

The empirical Green's function deconvolution technique is used to retrieve the source time function from the records of large seismic events induced by mining. The records of small events, generated near the larger events with similar source mechanism, are accepted as empirical Green's functions. The applied procedure, based on numerous trials and tests performed on real data, is described. Several examples of source time function determination for seismic events from Polish copper mines are given. The relative source time functions retrieved at several stations depend as a rule on the station azimuth. In such a case, several rupture parameters (the azimuth of rupture propagation direction, rupture velocity) can be calculated. The obtained source time functions are convolved with the corresponding records of small events, serving as empirical Green's functions, to generate the original wave-forms of the larger event as a final check-up of the applied procedure.