Результаты акустических нблюдений Б шахте 'анна' (пржибрам)

The paper describes some results of seismo-acustic observations in the 'Anna' mine (Příbram). These results show that the seismo-acustic regime has changed over a certain period of time in the region of rockburst. A decrease of the parameter in the magnitude-frequency relation was observed. A more detailed description of these changes of the regime over the period in question would call for more data then were available. [ABSTRACT FROM AUTHOR]