Advertisement

Acta Seismologica Sinica

, Volume 21, Issue 2, pp 127–138 | Cite as

Shear-wave splitting of Sichuan Regional Seismic Network

  • Yong-jiu Zhang (张永久)Email author
  • Yuan Gao (高原)
  • Yu-tao Shi (石玉涛)
  • Wan-zheng Cheng (程万正)
Article

Abstract

Using seismic data recorded by the Chengdu Digital Seismic Network from May 1, 2000 to December 31, 2006, we obtain the dominant polarization directions of fast shear-waves at eight digital seismic stations adopting the SAM technique. The results show that the dominant directions of polarizations of fast shear-waves at most of stations are mainly in nearly NE-SW or NW-SE direction in Sichuan. The dominant polarization directions of the fast shear-waves at stations located at the active faults or intersection of several active faults are consistent with the strikes of active faults which control the earthquakes used in the analysis, and are basically consistent with the directions of regional compression axis. However, several stations show that the fast shear-waves are not consistent with the strikes of active faults and the directions of regional compression axis, due to the influence of local complicated crustal structure.

Key words

shear-wave splitting polarization of fast shear-wave compression axis active fault Sichuan region 

CLC number

P135.3+

References

  1. AN Qi-mei, DING Li-feng, WANG Hai-zhong, et al. 2004. Research of property and activity of Longmen Mountain fault zone [J]. Journal of Geodesy and Geodynamics, 24(2): 115–119 (in Chinese).Google Scholar
  2. CHEN Tian-chang, FAN Jun, ZHENG Jian. 1996. Sn-wave polarization in Sichuan region [J]. Earthquake Research in Sichuan, (4): 85–90.Google Scholar
  3. CHEN Tian-chang, LI Zhi-jun, ZHANG Run-sheng, et al. 1995. Temporal changes in shear wave splitting after the M=5.2 Shimian Earthquake of June 9, 1989 [J]. Acta Seismologica Sinica, 8(1): 65–76.CrossRefGoogle Scholar
  4. CHEN Wan-zheng, DIAO Gui-ling, LÜ Yi-pei, et al. 2003. Focal mechanisms, displacement rate and mode of motion of the Sichuan-Yunnan block [J]. Seismology and Geology, 25(1): 71–87 (in Chinese).Google Scholar
  5. CHEN Wan-zheng, RUAN Xiang, ZHANG Yong-jiu. 2006. Types of focal mechanism solutions and parameter consistency of the sub-blocks in Sichuan and Yunnan provinces [J]. Acta Seismologica Sinica, 19(6): 605–619.CrossRefGoogle Scholar
  6. Cochran E S, Vidale J E, Li Y G. 2003. Near-fault anisotropy following the Hector Mine earthquake [J]. J Geophys Res, 108(B9): 2 436–2 447.CrossRefGoogle Scholar
  7. Crampin S and Atkinson B K. 1985. Microcracks in the Earth’s crust [J]. First Break, 3(3): 16–20.Google Scholar
  8. Crampin S. 1978. Seismic-wave propagation through a cracked solid: Polarization as a possible dilatancy diagnostic [J]. Geophys J R Astron Soc, 53: 467–496.CrossRefGoogle Scholar
  9. Crampin S. 2005. A review of shear-wave splitting in the compliant crack-critical anisotropic earth [J]. Wave Motion, 41: 59–77.CrossRefGoogle Scholar
  10. CUI Xiao-feng and XIE Fu-ren. 1999. Preliminary research to determine stress districts from focal mechanism solution in Southwest China and its adjacent area [J]. Acta Seismologica Sinica, 12(5): 562–572.CrossRefGoogle Scholar
  11. CUI Xiao-feng, XIE Fu-ren, ZHANG Hong-yan. 2006. Recent tectonic stress field zoning in Sichuan-Yunnan region and its dynamic interest [J]. Acta Seismologica Sinica, 19(5): 485–496.CrossRefGoogle Scholar
  12. Davis J C.1986. Statistics and Data Analysis in Geology [M]. Hoboken N J: John Wiley: 649.Google Scholar
  13. DENG Qi-dong, ZHANG Pei-zhen, RAN Yong-kang. 2002. Basic characteristics of active tectonics of China [J]. Science in China (Series D): 32(12): 1 020–1 030 (in Chinese).Google Scholar
  14. DIAO Gui-ling, CHENG Wan-zheng, LI Gui-fang, et al. 1995. The stress field in source region of the Xiaojin earthquake sequence in Sichuan [J]. Earthquake Research in China, 11(2): 168–173.Google Scholar
  15. DING Guo-yu. 1991. Lithospheric Dynamics of China [M]. Beijing: Seismological Press: 154–178 (in Chinese).Google Scholar
  16. Gao Y and Crampin S. 2004. Observations of stress relaxation before earthquakes [J]. Geophys J Int, 157(2): 578–582.CrossRefGoogle Scholar
  17. GAO Yuan and ZHENG Si-hua. 1994. On shear wave splitting in Tangshan region (II): Correlation function analysis method [J]. Earthquake Research in China, 10(Suppl.): 11–21 (in Chinese).Google Scholar
  18. GAO Yuan, LIANG Wei, Dg Xiang, et al. 2004a. Variational characteristics of shear-wave splitting on the 2001 Shidian earthquake in Yunnan, China [J]. Acta Seismologica Sinica, 17(6): 635–641.CrossRefGoogle Scholar
  19. GAO Yuan, LIU Xi-qiang, LIANG Wei, et al. 2004b. Systematic analysis method of shear-wave splitting: SAM software system [J]. Earthquake Research in China, 20(1): 101–107 (in Chinese).Google Scholar
  20. GAO Yuan, ZHENG Si-hua, SN Yong. 1995. Crack-induced anisotropy in the crust from shear wave splitting observed in Tangshan region, North China [J]. Acta Seismologica Sinica, 8(3): 351–364.CrossRefGoogle Scholar
  21. GAO Yuan, ZHENG Si-hua, WANG Pei-de. 1996. Shear wave splitting study on small earthquake swarm of 1992 in Dongfang of Hainan, China [J]. Chinese J Geophys, 39(2): 221–232 (in Chinese).Google Scholar
  22. GAO Yuan, ZHENG Si-hua, ZHOU Hui-lan. 1999. Polarization patterns of fast shear wave in Tangshan region and their variations [J]. Chinese J Geophys, 42(2): 228–232 (in Chinese).Google Scholar
  23. KAN Rong-ju, WANG Shao-jin, HANG Kun, et al. 1983. Modern stress field and relative motion of intraplate block in southwestern China [J]. Seismology and Geology, 5(2): 79–90.Google Scholar
  24. KAN Rong-ju, ZHANG Si-lu, YAN Feng-tong. 1977. Study on the current tectonic stress field and the characteristics of current tectonic activity in southwest China [J]. Chinese J Geophys, 20(2): 96–109 (in Chinese).Google Scholar
  25. KAN Rong-ju. 1980. The current tectonic stress field in southwest China and the inner strong seismic activity of block [J]. Journal of Seismological Research, 3(3): 45–59 (in Chinese).Google Scholar
  26. LAI Yuan-gen, LIU Qi-yuan, CHEN Jiu-hui. 2002. Features of the S-wave splitting and stress field in the Xinjiang Jiashi strong earthquake region [J]. Chinese J Geophys, 45(1): 83–93 (in Chinese).CrossRefGoogle Scholar
  27. LIN Bang-hui, CHEN Tian-chang, PU Xiao-hong, et al. 1986. Rupture processes of strong earthquakes on Xianshuihe fault belt and seismic activity [J]. Acta Seismologica Sinica, 8(1): 1–20(in Chinese).Google Scholar
  28. LIU Cheng-ming. 2000. New seismic characteristics of Huayingshan fault fold belt and inner reason discussion [J]. Earthquake Research in Sichuan, (4): 29–33 (in Chinese).Google Scholar
  29. MA Hong-sheng, ZHANG Guo-min, LIU Jie, et al. 2007. Coupling characteristics of stress and strain at different layers of different sub-regions in Yunnan and its adjacent areas [J]. Acta Seismologica Sinica, 20(2): 133–146.CrossRefGoogle Scholar
  30. MA Zong-jin. 1980. The multi-spot stress field and seismic activity of North China [J]. Seismology and Geology, 2(1): 39–48 (in Chinese).Google Scholar
  31. Mardia K V and Jupp P E. 2000. Directional Statistics [M]. Hoboken N J: John Wiley: 429.Google Scholar
  32. PU Xiao-hong and GUO Hui-lan. 1993. The character of current tectonic stress field interspace distribution and determination of latency hypocenter in Sichuan [J]. Northwestern Seismological Journal, 15(2): 97–99 (in Chinese).Google Scholar
  33. QIAO Xue-jun, WANG Qi, DU Rui-li. 1993. Characteristics of current crustal deformation of active blocks in the Sichuan-Yunnan region [J]. Chinese J Geophys, 47(5): 805–811.Google Scholar
  34. SHI Yu-tao, GAO Yuan, WU Jing, et al. 2006. Seismic anisotropy in the crust in Yunnan of China: Polarizations of fast shear-waves [J]. Acta Seismologica Sinica, 19(6): 620–632.CrossRefGoogle Scholar
  35. Shih X R and Meyer R P. 1990. Observation of shear wave splitting from nature events: South Moat of long Valley Caldera, California, June 29 to August 12, 1982 [J]. J Geophys Res, 95: 11 179–11 196.CrossRefGoogle Scholar
  36. WANG Chun-yong, DING Zhi-feng, CHEN Xue-bo, et al. 1997. The S-wave splitting and medium anisotropy of lithosphere in Dabieshan zone [J]. Chinese Science Bulletin, 42(23): 2 539–2 542.Google Scholar
  37. WANG Pei-de, Klinge K, Kruger F, et al. 2000. Variation of shear-wave splitting in earthquake clusters with very similar waveforms [J]. Acta Seismologica Sinica, 13(5): 536–543.CrossRefGoogle Scholar
  38. WEN Xue-ze. 2000. Character of rupture segmentation of the Xianshuihe-Zemuhe fault zone, western Sichuan [J]. Seismology and Geology, 22(3): 239–249 (in Chinese).Google Scholar
  39. WU Jing, GAO Yuan, CHEN Yun-tai, et al. 2007. Seismic anisotropy in the northwestern capital area of China [J]. Chinese J Geophys, 50(1): 209–220 (in Chinese).Google Scholar
  40. XU Zhong-huai, WANG Su-yun, HUANG Yu-rui, et al. 1987. Direcions of mean stress axes in southwestern China deduced from microeartquake data [J]. Chinese J Geophys, 30(5): 476–486 (in Chinese).Google Scholar
  41. YAO Chen, WANG Pei-de, CHEN Yun-tai. 1992. Shear-wave polarization and upper crustal crack anisotropy in Lulong [J]. Chinese J Geophys, 35(3): 305–315 (in Chinese).Google Scholar
  42. ZHANG Xi, JIANG Zai-sen, WANG Qi, et al. 2003. Recent crust motion features in Sichuan-Yunnan and their relationship to strong earthquake [J]. Journal of Geodesy and Geodynamics, 23(3): 35–41 (in Chinese).Google Scholar
  43. ZHANG Xiao-liang, JIANG Zai-sen, WANG Shuang-Xu, et al. 2005. Preliminary research on present horizontal block motion and deformation features in Sichuan-Yunnan area [J]. Journal of Seismological Research, 28(3): 262–267 (in Chinese).Google Scholar
  44. ZHAO Zhu and ZHANG Run-sheng. 1987. Primary study of crustal and upper mantle velocity structure of Sichuan Province [J]. Acta Seismologica Sinica, 9(2): 154–166 (in Chinese).Google Scholar
  45. ZHONG Ji-mao and CHENG Wan-zheng. 2006. Determination of directions of the mean stress field in Sichuan-Yunnan region from a number of focal mechanism solutions [J]. Acta Seismologica Sinica, 19(4): 359–369.CrossRefGoogle Scholar
  46. ZHU Ai-lan, XU XI-wei, ZHOU Yong-sheng, et al. 2005. Relocation of small earthquakes in western Sichuan, China and its implications for active tectonics [J]. Chinese J Geophys, 48(3): 629–636.CrossRefGoogle Scholar

Copyright information

© Seismological Society of China and Springer-Verlag GmbH 2008

Authors and Affiliations

  • Yong-jiu Zhang (张永久)
    • 1
    Email author
  • Yuan Gao (高原)
    • 2
  • Yu-tao Shi (石玉涛)
    • 2
  • Wan-zheng Cheng (程万正)
    • 1
  1. 1.Earthquake Administration of Sichuan ProvinceChengduChina
  2. 2.Institute of Earthquake ScienceChina Earthquake AdministrationBeijingChina

Personalised recommendations