jgg     2009 29 (5):  33-37    ISSN: 0412-1961  CN: 21-1139/TG ON OBSERVATION RESULTS OF SEISMIC WAVE OF SACKS BODY STRAIN Zhang Lingkong and Niu Anfu China Earthquake Networks Center，Beijing 100045 Received: 1900-01-01  Revised: 1900-01-01  Online: null Supporting info null