机译:汶川8.0级地震前地震活动特征。
Institute;
of;
Geophysics,;
China;
Earthquake;
Administration,;
Beijing;
100081,;
China;
China;
Earthquake;
Networks;
Center,;
Beijing;
100045,;
China;
Institute;
of;
Earthquake;
Science,;
China;
Earthquake;
Administration,;
Beijing;
100036,;
China;
Earthquake;
Administration;
of;
Shanghai;
Municipality,;
Shanghai;
200062,;
China;