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?????????嶫???2001??2004??2004??2007??GPS????????????????????λ???????о??????????????????????????????????????????????????????????????????????????????2004??2007???????嶫??????巴????????????μ???????????????????????????????????2001??2004??????????????????????С????Ρ??????????μ??????顢?????????2001??2004????????????????????????????????Ρ?????′??????????????????

RECENT HORIZONTAL CRUSTAL MOVEMENT AND STRAIN ACCUMULATION IN NORTHEASTERN MARGIN OF QINGHAI-TIBET BLOCK

By use of horizontal velocity data observed by GPS during 2001—2004 and 2004—2007 in the northeastern margin of Qinghai Tibet block, aided by the negative dislocation model, the characteristics of horizontal crustal movement and the status of strain accumulation of this area are researched and following conclusion are drawn. During the period of 2004—2007, the regional stress field, after the adjustment through the Kunlun Mountains, Yumen and Minle earthquakes, entirely reflects re constructing features in accordance with its long term background field. The eastern segment of Qilian Mountain fault zone roughly maintains the accumulating background of 2001—2004, there appears strengthening in the middle western segment of Qilian Mountain fracture zone, the southern segment of Zhuanglanghe fault and block of southern Gansu and Hexi corridor relative to 2001—2004; the eastern segment of Animaqing fracture zone，the northern foot fault of Qinling Range also present the features of stress strain accumulation.