【摘要】 利用青藏块体东北缘2001—2004年、2004—2007年GPS水平运动速度场结果,借助负位错模型,研究该区当前的地壳水平运动特征与应变积累状况。分析表明:经昆仑山、玉门、民乐地震后一段时间的调整,2004—2007年青藏块体东北缘总体反映与长期背景场一致的应变场重构特性。祁连山断裂带东段应变大体维持2001—2004年的积累背景;祁连山断裂带中—西段、庄浪河断裂南段及甘南地块、河西走廊较2001—2004年应变积累有所增强;阿尼玛卿断裂带东段、秦岭北麓断裂存在应变积累趋势。更多还原

【Abstract】 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.更多还原