Institute of Geophysics;
China Earthquake Administration;
Beijing 100081;
China Institute of Earthquake Science;
China Earthquake Administration;
Beijing 100036;
China;
Earthquake Administration of Hebei Province;
Shijiazhuang 050021;
China;
Institute of Earthquake Science;
China Earthquake Administration;
Beijing 100036;
China;
extended; coda-normalization; method; attenuation; of;