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Acta Seismologica Sinica

, Volume 7, Issue 3, pp 379–388 | Cite as

Process of source dynamics of the Jingtai earthquake (M=6.2)

  • Xue-Bin Du
  • Zhi-De Yan
  • Ming-Wu Zou
Article

Abstract

In this paper, the process of source dynamics of the Jingtai earthquake (M=6.2) is studied on the basis of both earth resistivity changes before the event and the spatial directivity of single-observatory magnitude measurements of the seismic network of China. The following conclusions are obtained: the NW-SE directional tension stress (or the one about in the direction) inside the source region was enhanced during the short period from three to five months before the event, and done still further about in twenty odd days before the event, so that it finally leads the fault in about the EW strike to produce dislocation in NWW-SEE direction. Finally, this dislocation pattern caused the strong ground vibration to be received at the seismic observatories which were located in the NWW and SEE directions of the epicenter, while the weak vibration to be received at the ones in NE and south directions of the epicenter. At last, understandings on the imminent earthquake prediction through earth resistivity method are set forth.

Key words

earth resistivity magnitude measurement active fault 

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References

  1. Chen, D. Y., Chen, F., Cao, Q. P. and Yu, S. J., 1991. Studies on the characteristics of the apparent resistivity changes in the shear and friction test with rock block on site.Annual of the Chinese Geophysical Society, 238pp. (7th Annual Meeting, Beijing, Oct. 8–12, 1991) (in Chinese).Google Scholar
  2. Du, X. B., 1992. Active fault-stress field effect of the imminent variation of earth resistivity (ρ 8) preceding an earthquake.Earthquake,1, 18–26 (in Chinese).Google Scholar
  3. Du, X. B., Zhao, H. Y. and Chen, B. Z., 1993. On the relation of the imminent sudden change in earth resistivity to the active fault and earthquake generating stress field.Acta Seismologica Sinica,6, 663–673 (in English).Google Scholar
  4. Du, X. B., Zhao, H. Y., Chen, B. Z. and Guo, H. M., 1992. Characteristics of earth resistivity changes before the Jingtai earthquake ofM s=6.2.Earthquake Research in China,8, 28–35 (in Chinese).Google Scholar
  5. Du, X. B. and Chen, B. Z., 1993. Recognition of sudden change in earth resistivity due to an earthquake.Northwestern Seismological Journal,15, 3, 50–65 (in Chinese).Google Scholar
  6. Guo, Z. J. and Qing, B. Y., 1979.Physics of Earthquake Source, 104–158. Seismological Press, Beijing (in Chinese).Google Scholar
  7. Hou, K. M., Zhang, S. J., Yuan, D. Y. and Cao, K. X., 1992. Intensity distribution of 1990 Jintai earthquake and generating fault.Earthquake Research in China,8, 60–67 (in Chinese).Google Scholar
  8. Hou, Z. Q. and Cai, S. H., 1990. The Jingtai-Tianzhu of Gansu Province, earthquake (M=6.2).Northwestern Seismological Journal,12, 4, 48 (in Chinese).Google Scholar
  9. Lu, Y. Q., Qian, J. D. and Liu, J. Y., 1990. An experimental study on the precursory features of apparent resistivity and acoustics emission of large scale of granite specimen during the process of slowly dilatancy rupturing.Northwestern Seismological Journal,12, 2, 35–41 (in Chinese).Google Scholar
  10. Wen, Z. P., 1991. Mechanism of the Tianzhu-Gulang earthquake ofM s=6.2 on Oct. 20, 1990.Northwestern Seismological Journal,13, 1, 92 (in Chinese).Google Scholar
  11. Yan, Z. D. and Wang, Z. Y., 1992. Seismic pattern and characteristics of the Jingtai earthquake of Oct. 20, 1990.Northwestern Seismological Journal,14, 2, 42–48 (in Chinese).Google Scholar

Copyright information

© Acta Seismologica Sinica 1994

Authors and Affiliations

  • Xue-Bin Du
    • 1
  • Zhi-De Yan
    • 1
  • Ming-Wu Zou
    • 1
  1. 1.Earthquake Research Institute of LanzhouState Seismological BureauLanzhouChina

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