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首页> 外文期刊>Journal of Asian earth sciences >Quantitative analysis of the shallow crustal tectonic stress field in China mainland based on in situ stress data
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Quantitative analysis of the shallow crustal tectonic stress field in China mainland based on in situ stress data

机译：基于原地应力数据的中国大陆浅层地壳构造应力场定量分析

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The latest hydraulic fracturing and stress relief measurement data in the Chinese mainland were collected. The total of 3856 data entries are measured at 1474 locations. The measured area covers 75-130°E and 18-47°N, and the depth range varies from surface to 4000 meters depth, which generally includes each active tectonic block of China and each segment of North-South seismic belt. We investigated the tectonic stress field by removing the effect of gravity. For this, we assume lateral constraints and Heim's rule. The gravity contribution is removed by using the assumption of lateral constraint and Heim's rule. Our results show: (1) the maximum and the minimum horizontal principal stress σ_H,σ_h and the vertical stress σ_v in the shallow crust of China all increase linearly with depth: σ_H= 0.0229D + 4.738, σ_h - 0.0171D + 1.829, σ_v = 0.0272D. Maximum and minimum horizontal tectonic stress varies as a function of depth D linearly 4.738 < σ_T < 0.0139D + 4.738 and 1.829 < σ_t < 0.0162D + 1.829. The horizontal tectonic differential stress is σ_T -σ_t = 0.0058D + 2.912. (2) The intermediate value of σ_T (regression value of tectonic stress inferred from the assumption of lateral constraint at 2000 m depth) changes in different areas, the maximum value of which is 45.6 MPa, while the minimum value of which is 26.8 MPa. Horizontal tectonic differential stress σ_T -σ_t increases linearly with depth and the maximum and minimum of σ_T - σ_t is 25.3 MPa and 13.0 MPa, respectively. In general, the stress magnitude is much higher in western than in eastern China. This indicates that the strong Indo-Eurasian collision dominates the present tectonic stress field in Chinese mainland. (3) Compared with other study regions, the northward crustal compression to the Qjnghai-Tibet block is relatively lower in magnitude in the shallow subsurface and higher at deeper depth. (4) The orientations of σ_T in China mainland generally form a radial scattering pattern centered in Tibetan Plateau. From western to eastern China, they rotate gradually clockwise from NS to NNE, NE, NEE, and SE, which is consistent with the result of focal mechanism solutions.
机译：收集了中国大陆最新的水力压裂和应力释放测量数据。在1474个位置测量了总共3856个数据条目。测得的区域覆盖了75-130°E和18-47°N，深度范围从地表到4000米深度不等，通常包括中国的每个活动构造块和南北地震带的每个部分。我们通过消除重力作用研究了构造应力场。为此，我们假设有横向约束和海姆法则。通过使用侧向约束和海姆法则的假设来消除重力贡献。我们的结果表明：（1）中国浅层地壳的最大和最小水平主应力σ_H，σ_h和垂直应力σ_v随深度呈线性增加：σ_H= 0.0229D + 4.738，σ_h-0.0171D + 1.829，σ_v = 0.0272D。最大和最小水平构造应力随深度D线性变化4.738 <σ_T<0.0139D + 4.738和1.829 <σ_t<0.0162D + 1.829。水平构造差分应力为σ_T-σ_t= 0.0058D + 2.912。 （2）σ_T的中间值（从2000 m深度处的横向约束假设推断出的构造应力的回归值）在不同区域变化，最大值为45.6 MPa，最小值为26.8 MPa。水平构造微分应力σ_T-σ_t随深度线性增加，σ_T-σ_t的最大值和最小值分别为25.3 MPa和13.0 MPa。总体而言，西部地区的应力水平比中国东部地区高得多。这表明强烈的印度-欧亚碰撞主导了中国大陆目前的构造应力场。 （3）与其他研究区域相比，青藏高原地壳向北的压缩程度在浅层地下相对较低，而在较深层则较高。 （4）σ_T在中国大陆的方位一般形成以青藏高原为中心的径向散射模式。从西部到东部，它们逐渐从NS到NNE，NE，NEE和SE顺时针旋转，这与震源机制解的结果是一致的。

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