|
|
- 2015
云南地区复杂地震各向异性分析
|
Abstract:
摘要 地震各向异性可以反映地壳和上地幔形变信息.SKS震相由于近乎垂直入射,具有良好的横向分辨率.本文收集云南地区大量地震资料,提取并分析SKS分裂结果,发现研究地区各向异性很复杂,南北差异较大.进一步利用双层地震各向异性模型分析KMI台下方可能存在的双层各向异性特征:上层快波偏振方向130°,延迟时间0.2 s,而下层快波偏振方向90°,延迟时间0.9 s,与观测结果吻合较好.
| [1] | Cook K L, Royden L H. The role of crustal strength variations in shaping orogenic plateaus, with application to Tibet[J]. Journal of Geophysical Research, 2008, 113(B8):B08407. |
| [2] | 阮爱国,王椿镛.云南地区上地幔各向异性研究[J].地震学报,2002,24(3):260-270. |
| [3] | 常利军,王椿镛,丁志峰.云南地区 SKS 波分裂研究[J].地球物理学报,2006,49(1):197-204. |
| [4] | Sun Y, Niu F L, Liu H F, et al. Crustal structure and deformation of the SE Tibetan plateau revealed by receiver function data[J]. Earth and Planetary Science Letters, 2012,349(350):186-197. |
| [5] | Wei W, Zhao D P, Xu J D. P-wave anisotropic tomography in Southeast Tibet:new insight into the lower crustal flow and seismotectonics[J]. Physics of the Earth and Planetary Interiors, 2013,222:47-57. |
| [6] | Lei J S, Li Y, Xie F R, et al. <em>P</em><sub><em>n</em></sub> anisotropic tomography and dynamics under eastern Tibetan plateau[J]. Journal of Geophysical Research:Solid Earth, 2014, 119:2 174-2 198. |
| [7] | 郑斯华,高原.中国大陆岩石层的方位各向异性[J].地震学报,1994,15(2):131-140. |
| [8] | Gan W, Zhang P, Shen Z K, et al. Present-day crustal motion within the Tibetan Plateau inferred from GPS measurements[J]. Journal of Geophysical Research, 2007, 112(B8):B08416. |
| [9] | England P, Houseman G. Finite strain calculations of continental deformation:2.Comparison with the India-Asia collision zone[J]. Journal of Geophysical Research, 1986, 91(B3):3 664-3 676. |
| [10] | Ni J F, Speziale M G, Bevis M, et al. Accretionary tectonics of Burma and the three-dimensional geometry of the Burma subduction zone[J]. Geology, 1989, 17:68-71. |
| [11] | Shi Y, Gao Y, Su Y, et al. Shear-wave splitting beneath Yunnan area of southwest China[J]. Earthquake Science, 2012, 25(1):25-34. |
| [12] | Silver P G, Savage M K. The interpretation of shear-wave splitting parameters in the presence of two anisotropic layers[J]. Geophysical Journal International, 1994, 199:949-963. |
| [13] | Gao S S, Liu K H. Significant seismic anisotropy beneath the southern Lhasa Terrane, Tibetan Plateau[J]. Geochemistry, Geophysics, Geosystems, 2009, 10(2):Q0208. |
| [14] | Wüstefeld A, Bokelmann G, Zaroli C, et al. SplitLab:a shear-wave splitting environment in Matlab[J]. Computers & Geosciences, 2008, 34(5):515-528. |
| [15] | <p> Molnar P, England P, Martinod J. Mantle dynamics, uplift of the Tibetan plateau, the Indian Monsoon[J]. Reviews of Geophysics,1993, 31:357-396. |
| [16] | Tapponnier P, Zhiqin X, Roger F, et al. Oblique stepwise rise and growth of the Tibet plateau[J]. Science, 2001, 294(5 547):1 671-1 677. |
| [17] | Flesch L, Holt W, Silver P, et al. Constraining the extent of crust-mantle coupling in central Asia using GPS, geologic, and shear wave splitting data[J]. Earth and Planetary Science Letters, 2005, 238(1/2):248-268. |
| [18] | Lev E, Long M, Vander H R. Seismic anisotropy in Eastern Tibet from shear wave splitting reveals changes in lithospheric deformation[J]. Earth and Planetary Science Letters, 2006, 251(3/4):293-304. |
| [19] | Yao H, Vander H R, Montagner J P. Heterogeneity and anisotropy of the lithosphere of SE Tibet from surface wave array tomography[J]. Journal of Geophysical Research, 2010, 115:B12307. |
| [20] | Wang C, Flesch L M, Silver P G, et al. Evidence for mechanically coupled lithosphere in central Asia and resulting implication[J]. Geology, 2008, 36:363-366. |
| [21] | 王椿镛, 常利军, 丁志峰, 等. 中国大陆上地幔各向异性和壳幔变形模式[J]. 中国科学:地球科学, 2014,44:98-110. |
| [22] | Park J, Levin V. Seismic anisotropy:tracing plate dynamics in the mantle[J]. Science, 2002, 296(5 567):485-489. |
| [23] | Wüstefeld A, Bokelmann G. Null detection in shear-wave splitting measurements[J]. Bulletin of the Seismological Society of America, 2007, 97(4):1 204-1 211. |
| [24] | Huang J L, Zhao D P. High-resolution mantle tomography of China and surrounding regions[J]. Journal of Geophysical Research, 2006,111(B9):B09305. |
| [25] | Zhang P Z, Shen Z, Wang M, et al. Continuous deformation of the Tibetan Plateau from global positioning system data[J]. Geology, 2004, 32(9):809-812. |
| [26] | Crampin S, Atkinson B K, Microcracks in the Earth's crust[J]. First Break, 1985,3(3):16-20. |
| [27] | Gao Y, Wu J, Fukao Y, et al. Shear wave splitting in the crust in North China:stress, faults and tectonic implications[J]. Geophysical Journal International, 2011, 187(2):642-654. |
| [28] | Huang Z C, Wang P, Zhao D P, Wang L S, Xu M J. Three-dimensional P wave azimuthal anisotropy in the lithosphere beneath China[J]. Journal of Geophysical Research:Solid Earth, 2014, 119:5 686-5 712. |
| [29] | Bowman J R, Ando M. Shear-wave splitting in the upper-mantle wedge above the Tonga subduction zone[J]. Geophysical Journal of the Royal Astronomical Society, 1987, 88:25-41. |
| [30] | Silver P G, Chan W W. Shear wave splitting and subcontinental mantle deformation[J]. Journal of Geophysical Research, 1991, 96 (15):16 429-16 454. |
| [31] | Huang Z C, Wang L S, Zhao D P, et al. Seismic anisotropy and mantle dynamics beneath China[J]. Earth and Planetary Science Letters, 2011, 306(1/2):105-117.</p> |
