jgg     2009 29 (4):  15-20    ISSN: 0412-1961  CN: 21-1139/TG RELATIVE MOTIONS OF BLOCKS IN CHINA CONTINENT AND THERE RELATIONS WITH STRONG SEISMIC ACTIVITY Zhang Yuegang 1) ;Zhang Jing 2) ; and Wang Min 2) 1) Earthquake Administration of Hebei Province, Shijiazhuang 0500212) Institute of Earthquake Science, CEA, Beijing 100036 Received: 1900-01-01  Revised: 1900-01-01  Online: null Supporting info null