Key;
Laboratory;
of;
Coal;
Resources;
and;
Safe;
Mining,;
China;
University;
of;
Mining;
&;
Technology,;
Beijing;
100083,;
China;
Research;
Center;
of;
Seismologic;
Surveying,;
Fujian;
361021,;
China;
of;
Computer;
Engineering,;
Ordnance;
Engineering;
College,;
Shijiazhuang;
050003,;
China;