The Characteristics of Recent Crustal Horizontal Movement and Strain Stress Field in North China
The Characteristics of Recent Crustal Horizontal Movement and Strain Stress Field in North China
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DOI：
10.1002/cjg2.84
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发表时间：
2000-09
期刊：
影响因子：
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通讯作者：
Zaisen Jiang;Xi Zhang;Bing Chen;F. Xue
中科院分区：
文献类型：
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作者：
Zaisen Jiang;Xi Zhang;Bing Chen;F. Xue
利用华北GPS监测网1992年、1995年和1996年的观测资料，采用最小二乘配置法，给出了华北地区相对水平位移场和应变场的分布规律。初步研究结果如下。1992-1995年华北地区水平位移场和应变场总体上表现为不均匀的挤压运动，1995-1996年监测区东部以水平挤压运动为主，西部以张性运动为主。水平运动（方向和幅度）变化明显、应变高的区域主要位于块体边界带和主断裂带附近。北东向断裂带作为燕山断块的南边界，表现出较为显著的左旋运动。最大剪应变和表观膨胀的高值区主要分布在天津、北京、唐山地区。结合DDA方法，初步分析表明：1992-1995年的GPS观测结果表明，华北东西部构造应力存在明显差异，华北东部以东西向压应力为主，而华北西部南北向构造应力明显大于东部。
Making use of observational data of North China GPS monitoring network in the years 1992, 1995, and 1996, the distribution patterns of relative horizontal displacement field and strain field in North China area are presented with the aid of least square collocation. Preliminary study results are as follows. During 1992–1995 in North China, the horizontal displacement and strain fields appear as inhomogeneous compressive movement as a whole, during 1995–1996, the east of monitoring area shows mainly horizontal compressive movement, but the west of monitoring area mainly shows tensional movement. The region where horizontal movement (direction and amplitude) changes remarkably and strain is high is mainly located at block boundary belts and nearby main fracture belts. The northeast fracture zone which is the south boundary of Yanshan fault block shows relatively notable sinistral movement. Moreover, the region of high maximum shear strain and superficial expansion in this area is distributed in Tianjin, Beijing, Tangshan area. Combining with DDA method, preliminary analysis shows that there exists obvious difference of tectonic stress between the east and the west of North China as demonstrated by GPS observations in 1992–1995, in the east of North China east-west direction compressive stress dominates, but the south-north direction tectonic stress in the west of North China is obviously larger than that of the east.