网格内不满足均匀性假设对应力场反演结果的影响——以喜马拉雅东构造结及其周边地区应力场研究为例
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摘要
本研究搜集了GCMT中自1976年1月1日至2017年4月30日喜马拉雅东构造结及其周边区域的102个震源机制解数据,应用MSATSI软件反演了该区域的构造应力场.反演结果给出了该区域应力场的总体特征:最大主压应力轴自西向东呈现NNE-NE偏转,最小主压应力轴自西向东呈现NWW-NW-NNW扇形偏转;整个研究区域σ_3轴倾角较小接近水平,σ_1轴倾角情况复杂,大体上自西向东由水平转向直立;R值自西北至东南出现规律性递增现象.根据反演结果,部分网格点中应力轴倾角的置信区间过大,且不同应力轴的置信区间存在重叠现象,同时该部分网格内震源机制解类型多样.针对上述现象,本文利用两种反演方法对单个网格基于不同类型震源机制解数据进行单独反演、利用人工合成震源机制数据进行验证以及各震源机制解相对于参考应力张量的残差分析等方法对其进行了深入的验证和分析,分析结果表明导致这一现象的原因可能是单个网格内应力场不均匀所致,此时应力场反演结果为多个应力场的综合.本研究结果可为后续应力场研究中网格的合理划分以及应力场结果评价提供参考.
This study inverted the tectonic stress field of Eastern Himalayan Syntaxis and its surrounding areas by using the MSATSI software by means of this region's 102 focal mechanism solutions from January 1, 1976 to April 30, 2017 released in the GCMT catalogue. The inversion results give the general characteristics of the stress field in this area: the maximum principal compressive stress axis shows deflection in NNE-NE direction from west to east, and the minimum principal compressive stress axis shows fan deflection in NWW-NW-NNW direction from west to east; The plunge of σ_3 axis is small in the whole study area, and the plunge of σ_1 axis is complex, generally shifting from horizonta to vertical from west to east; R value appears regular increase from northwest to southeast. According to the inversion result, the confidence interval of the stress axis' plunge in some grid points is too large, moreover the confidence intervals of different stress axis overlap, simultaneously, the types of focal mechanism solutions in these grid are various. In view of the above phenomena, this paper has conducted in-depth verification and analysis by using two inversion methods to invert stress field of single grid basing on different types of focal mechanism solution data, using artificial synthetic focal mechanism data to confirm and residual analysis of each focal mechanism solution relative to the reference stress tensor. The analysis shows that the phenomenon may be caused by the inhomogeneous stress field in a single grid, and the stress field inversion result is the neutralization of multiple stress fields. The results of this study can provide reference for the rational division of the grid and the evaluation of stress field results in the subsequent stress field study.
This study inverted the tectonic stress field of Eastern Himalayan Syntaxis and its surrounding areas by using the MSATSI software by means of this region's 102 focal mechanism solutions from January 1, 1976 to April 30, 2017 released in the GCMT catalogue. The inversion results give the general characteristics of the stress field in this area: the maximum principal compressive stress axis shows deflection in NNE-NE direction from west to east, and the minimum principal compressive stress axis shows fan deflection in NWW-NW-NNW direction from west to east; The plunge of σ_3 axis is small in the whole study area, and the plunge of σ_1 axis is complex, generally shifting from horizonta to vertical from west to east; R value appears regular increase from northwest to southeast. According to the inversion result, the confidence interval of the stress axis' plunge in some grid points is too large, moreover the confidence intervals of different stress axis overlap, simultaneously, the types of focal mechanism solutions in these grid are various. In view of the above phenomena, this paper has conducted in-depth verification and analysis by using two inversion methods to invert stress field of single grid basing on different types of focal mechanism solution data, using artificial synthetic focal mechanism data to confirm and residual analysis of each focal mechanism solution relative to the reference stress tensor. The analysis shows that the phenomenon may be caused by the inhomogeneous stress field in a single grid, and the stress field inversion result is the neutralization of multiple stress fields. The results of this study can provide reference for the rational division of the grid and the evaluation of stress field results in the subsequent stress field study.
引文
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Cao J L, Shi Y L, Zhang H, et al. 2009. Numerical simulation of GPS observed clockwise rotation around the eastern Himalayan syntax in the Tibetan Plateau [J]. Chinese Science Bulletin (in Chinese), 54(02): 224-234, doi: 10.1007/s11434- 008- 0588-7.
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Ekstr?m G, Nettles M, Dziewoński A M. 2012. The global CMT Project 2004—2010: Centroid-moment tensors for 13017 earthquakes [J]. Physics of the Earth and Planetary Interiors, 200-201: 1-9.
Ge W P. 2016. GPS Constrained Precent-day Crust Deformation Mechanism of Tibetan Plateau:Evidence from 3D Movements of Altyn Tagh fault and Plateau Crustal Thinning [Ph.D. thesis]. Institute of Geology, China Earthquake Administration(in Chinese).
Gephart J W, Forsyth D W. 1984. An improved method for determining the regional stress tensor using earthquake focal mechanism data: Application to the San Fernando earthquake sequence [J]. Journal of Geophysical Research, 89 (B11): 9305-9320.
Guiraud M, Laborde O, Philip H. 1989. Characterization of various types of deformation and their corresponding deviatoric stress tensors using microfault analysis [J]. Tectonophysics, 170(3- 4): 289-316.
Guo L Q. 2000. Preliminary study on the Horizontal Crustal Deformation in Chinese Mainland [J]. Earthquake Research in China (in Chinese), 16(2): 32- 40.
Guo L Q, Huang L R. 2000. Study on crustal strain and stress fields in China continent [J]. North China Earthquake Sciences (in Chinese), 18(3): 50-58.
Guo L Q, Zhou H T, Du X S, et al. 2012. Studies on Stress-strain Field of Chinese Mainland [J]. South China Journal of Seismology (in Chinese), 32(01): 1-10.
Guo X Y, Chen X Z, Wang S W, et al. 2014. Focal Mechanism of Small and Moderate Earthquakes and Tectonic Stress Field in Sichuan-Yunan Areas [J]. China Earthquake Engineering Journal (in Chinese), 36(3): 599- 607.
Hardebeck J L, Micheal A J. 2006. Damped regional-scale stress inversions: Methodology and examples for southern California and the Coalinga aftershock sequence [J]. Journal of Geophysical Research, 111(B11): B11310.
Huang J C, Wan Y G, Sheng S Z, et al. 2016. Heterogeneity of present-day stress field in the Tonga-Kermadec subduction zone and its geodynamic significance [J]. Chinese J.Geophys (in Chinese). 59(2): 578-592, doi: 10.6038/cjg20160216.
Lu Z, Wyss M. 1996. Segmentation of the Aleutian plate boundary derived from stress direction estimates based on fault plane solutions [J]. J. Geophys Res., 101(B1): 803-816.
Lu Z, Wyss M, Pulpan H. 1997. Details of stress directions in the Alaska subduction zone from fault plane solutions [J]. J. Geophys Res., 102(B3): 5385-5402.
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