Key Laboratory of Earthquake Prediction;
Institute of Earthquake Science;
CEA;
Beijing 100036;
China;
University of Illinois at Urbana-Champaign;
Urbana IL61801;
USA;
Institute of Geophysics;
China Earthquake Administration;
Beijing 100081;
China;
Ambient; noise; Noise; source; Amplitude; of; surface; wave; Attenuation;