Guan Jian, Wu Qingju. 2014: The preliminary SKS splitting results in the central Mongolia. Acta Seismologica Sinica, 36(4): 546-556. DOI: 10.3969/j.issn.0253-3782.2014.04.002
Citation: Guan Jian, Wu Qingju. 2014: The preliminary SKS splitting results in the central Mongolia. Acta Seismologica Sinica, 36(4): 546-556. DOI: 10.3969/j.issn.0253-3782.2014.04.002

The preliminary SKS splitting results in the central Mongolia

More Information
  • Received Date: June 25, 2013
  • Revised Date: August 08, 2013
  • Published Date: June 30, 2014
  • A passive seismic array with 60 broadband seismometers was deployed in the central Mongolia by the cooperation between Institute of Geophysics, China Earthquake Administration and Research Center of Astronomy and Geophysics, Mongolian Academy of Sciences, to carry out the deep structure observation and modeling study. The passive seismic array was distributed within the Caledonian orogen and the Hercynian orogen separated by the Ergis-central Mongolia-Eerguna fault zone. The teleseismic waveform data from part of the array with the epicentral distance of 85°—135° and MW5.0, from August 2011 to July 2012, was selected to do SKS splitting analysis through the SplitLab package. Three methods, i.e., the minimum energy of tangential component (SC), the rotation and correlation (RC), and eigenvalue (EV), are simultaneously applied for each SKS waveform data. The preliminary anisotropy result was obtained for the central Mongolia. It shows that the time delay between fast and slow waves is within 0.8—2.0 s, and the polarization direction of fast wave is about N40°W, almost perpendicular to the geological structure strike direction of ENE--WSW. The fast direction is about 15° systematically clockwise to the absolute plate motion inferred from the HS3-NUVEL-1A model. It is also noted that not only the two different splitting modes are simultaneously observed beneath certain station, but also the fast wave direction parallel to the ENE--WSW striking direction exists beneath certain station.
  • 常利军, 王椿镛, 丁志峰. 2006. 云南地区SKS波分裂研究[J]. 地球物理学报, 49(1): 197-204.

    Chang L J, Wang C Y, Ding Z F. 2006. A study on SKS splitting beneath the Yunnan region[J]. Chinese Journal of Geophysics, 49(1): 197-204 (in Chinese).
    常利军, 王椿镛, 丁志峰. 2009. 首都圈地区SKS波分裂研究[J]. 地震学报, 30(6): 551-559.

    Chang L J, Wang C Y, Ding Z F. 2009. A study on SKS splitting beneath capital area of China[J]. Acta Seismologica Sinica, 30(6): 551-559 (in Chinese).
    车自成, 刘良, 罗金海. 2002. 中国及其邻区区域大地构造学[M]. 北京: 科学出版社: 226-228.

    Che Z C, Liu L, Luo J H. 2002. Tectonics of China and Its Adjacent Areas[M]. Beijing: Science Press: 226-228 (in Chinese).
    王永锋, 金振民. 2005. 地震波各向异性: 窥测地球深部构造的 "探针"[J]. 地球科学进展, 20(9): 946-953.

    Wang Y F, Jin Z M. 2005. Seismic anisotropy: A probe to understand the structure in Earth's interior[J]. Advances in Earth Science, 20(9): 946-953 (in Chinese).
    吴萍萍, 王椿镛, 丁志峰, 常利军, 李振. 2012. 大别-苏鲁及邻区上地幔的各向异性[J]. 地球物理学报, 55(8): 2539-2550

    Wu P P, Wang C Y, Ding Z F, Chang L J, Li Z. 2012. Seismic anisotropy of upper mantle beneath the Dabie-Sulu and its adjacent areas[J]. Chinese Journal of Geophysics, 55(8): 2539-2550 (in Chinese).
    张萍. 2011. 基于Bootstrap方法的统计分析[J]. 宜宾学院学报, 11(12): 31-33.

    Zhang P. 2011. Statistical analysis based on Bootstrap method[J]. Journal of Yibin University, 11(12): 31-33 (in Chinese).
    张建利, 田小波, 张洪双, 司少坤, 张中杰, 滕吉文. 2012. 贝加尔裂谷区地壳上地幔复杂的各向异性及其动力学意义[J]. 地球物理学报, 55(8): 2523-2538.

    Zhang J L, Tian X B, Zhang H S, Si S K, Zhang Z J, Teng J W. 2012. The crust and upper mantle anisotropy in Baikal Rift Zone and its dynamic significance[J]. Chinese Journal of Geophysics, 55(8): 2523-2538 (in Chinese).
    Barruol G, Deschamps A, Déverchère J, Mordvinova V V, Ulziibat M, Perrot J, Artemiev A A, Dugarmaa T, Bokelmann G H R. 2008. Upper mantle flow beneath and around the Hangay dome, Central Mongolia[J]. Earth Planet Sci Lett, 274(1/2): 221-233.
    Bowman J R, Ando M. 1987. Shear-wave splitting in the upper-mantle wedge above the Tonga subduction zone[J]. Geophys J Int, 88(1): 25-41.
    Efron B. 1979. Bootstrap methods: Another look at the jackknife[J]. The Annals of Statistics, 7(1): 1-26.
    Gao S, Davis P M, Liu H, Slack P D, Zorin Y A, Mordvinova V V, Kozhevnikov V M, Meyer R P. 1994a. Seismic anisotropy and mantle flow beneath the Baikal rift zone[J]. Nature, 371(6493): 149-151.
    Gao S, Davis P M, Liu H, Slack P D, Zorin Y A, Logatchev N A, Kogan M, Burkholder P, Meyer R P. 1994b. Asymmetric unwarp of the asthenosphere beneath the Baikal rift zone, Siberia[J]. J Geophys Res, 99(B8): 319-330.
    Gripp A E, Gordon R G. 2002. Young tracks of hotspots and current plate velocities[J]. Geophys J Int, 150(2): 321-361.
    Li Y H, Wu Q J, Zhang F X, Zhang R Q. 2011. Seismic anisotropy of the Northeastern Tibetan Plateau from shear wave splitting analysis[J]. Earth Planet Sci Lett, 304(1/2): 147-157.
    Silver P G, Chan W W. 1988. Implications for continental structure and evolution from seismic anisotropy[J]. Nature, 335(6185): 34-39.
    Silver P G, Chan W W. 1991. Shear wave splitting and subcontinental mantle deformation[J]. J Geophys Res, 96(16): 16429-16454.
    Tapponnier P, Molnar P. 1979. Active faulting and Cenozoic tectonics of the Tien Shan, Mongolia, and Baykal regions[J]. J Geophys Res, 84(B7): 3425-3459.
    Vauchez A, Tommasi A, Barruol G, Maumus J. 2000. Upper mantle deformation and seismic anisotropy in continental rifts[J]. Phys Chem Earth PT A, 25(2): 111-117.
    Wüstefeld A, Bokelmann G. 2007. Null detection in shear-wave splitting measurements[J]. Bull Seismol Soc Am, 97(4): 1204-1211.
    Wüstefeld A, Bokelmann G, Zaroli C, Barruol G. 2008. SplitLab: A shear-wave splitting environment in Matlab[J]. Computers & Geosciences, 34(5): 515-528.
    Zorin Y A, Kozhevnikov V M, Novoselova M R, Turutanov E K. 1989. Thickness of the lithosphere beneath the Baikal rift zone and adjacent regions[J]. Tectonophysics, 168(4): 327-337.
  • Related Articles

  • Cited by

    Periodical cited type(0)

    Other cited types(3)

Catalog

    Article views (581) PDF downloads (17) Cited by(3)

    /

    DownLoad:  Full-Size Img  PowerPoint
    Return
    Return