YAO Rui,
YANG Shu-Xin,
XIE Fu-Ren et al
.2017.Analysis on magnitude characteristics of the shallow crustal tectonic stress field in Qinghai-Tibet plateau and its adjacent region based on in-situ stress data.Chinese Journal Of Geophysics,60(6): 2147-2158,doi: 10.6038/cjg20170610
Analysis on magnitude characteristics of the shallow crustal tectonic stress field in Qinghai-Tibet plateau and its adjacent region based on in-situ stress data
YAO Rui1,2, YANG Shu-Xin1,2, XIE Fu-Ren1,2, CUI Xiao-Feng1,2, LU Yuan-Zhong1,2, XU Zhao-Yi3
1. Institute of Crustal Dynamics, China Earthquake Administration, Beijing 100085, China; 2. Key Laboratory of Crustal Dynamics, Institute of Crustal Dynamics, China Earthquake Administration, Beijing 100085, China; 3. Beijing Jiaotong University, Beijing 100044, China
Abstract：Up to 2000 entries of in situ stress data measured by hydraulic fracturing and stress relief method within 21°N—40°N, 73°N—110°N, 0~2 km were selected from the "Database of Crustal Stress in China and Adjacent Area". After solving the problem of non-uniform distribution of stress data along the depth and removing the gravity contribution by limiting their upper and lower thresholds using the Heim's rule and Gennik's assumption, we studied the tectonic stress characteristics of the shallow crust in Qinghai-Tibet Plateau and its adjacent region. Our results show that: (1) In the entire study area, the maximum and minimum horizontal stress (σH, σh) in the shallow crust both increase linearly with depth (D) respectively: σH=22.115D+5.761, σh=14.893D+3.269. The estimated magnitude range of maximum and minimum horizontal tectonic stress (σT, σt) are 4.609< σT< 15.522D+4.609 (D >0) and 3.121< σt< 6.366D+3.121 (D >0) respectively. The difference of maximum and minimum horizontal tectonic stress (σT-σt) increases linearly with depth: σT-σt=7.222D+2.492, i. e. the value of σT-σt on surface is about 2.5 MPa and the gradient of σT-σt is 7.2 MPa·km-1. (2) In the Qinghai-Tibet block and N-S seismic belt, σT, σt, σT-σt all increase linearly with depth. At 1 km depth, the maximum value of σT in those blocks is 30.1 MPa, while the minimum value is 17.6 MPa. The estimated values of σT in different areas decrease in the following order: Qinghai-Tibet, north segment of north-south seismic belt, middle segment of north-south seismic belt and south segment of North-South seismic belt. At 1 km depth, the maximum value of σT-σt in those blocks is 15.8 MPa, while the minimum value is 8.9 MPa. The descending order of the values in different areas is same as above. In general, the tectonic stress magnitude is much higher in Qinghai-Tibet block than in N-S seismic belt. (3) Compared with the N-S seismic belt, the northward crustal compression in the Qinghai-Tibet block is relatively lower in magnitude in the shallow subsurface and higher in deep, apparently displays a "weaker in the shallow but stronger in the deep" feature.
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