jgg     2010 30 (5):  68-72    ISSN: 0412-1961  CN: 21-1139/TG METHOD OF BEAM FORMING FOR EXTRACTING SEISMICWAVE INFORMATION BY USING GPS ARRAY DATA Lu Yaying 1) ; Wu Jicang 1) ; Meng Guojie 2) ; and Hu Congwei 1) 1) Department of Surveying and Geo-informatics, Tongji University, Shanghai 2000922) Institute of Earthquake Science, CEA, Beijing 100036 Received: 1900-01-01  Revised: 1900-01-01  Online: null Supporting info null