jgg     2007 27 (1):  31-34    ISSN: 0412-1961  CN: 21-1139/TG DEEP TECTONIC BACKGROUND OF THREE Ms>7.0 STRONG EARTHQUAKES IN BOHAI AND ITS ADJACENT REGION Lai Xiaoling 1) ; Li Songlin 1) ; and Sun Yi 2) 1)Geophysical Exploration Center, CEA, Zhengzhou 4500022)North China Institute of Water Conservancy and Hydroelectric Power, Zhengzhou 450008 Received: 1900-01-01  Revised: 1900-01-01  Online: null Supporting info null