pure and applied geophysics

, Volume 122, Issue 6, pp 901–920 | Cite as

Regional study of the anomalous change in apparent resistivity before the Tangshan earthquake (M=7.8, 1976) in China



Electrical resistivity measurements have been conducted as a possible means for obtaining precursory earthquake information. Before five great earthquakes (M>7,h<25 km) in China, the apparent resistivity ρ a showed systematic variations within a region 200 km from the epicenters. In particular, 9 stations in the Tangshan-Tianjin-Beijing region prior to the Tangshan earthquake (M=7.8,h=11 km, 27 July 1976) showed a consistent decrease of apparent resistivity around the epicenter, with a maximum resistivity change of 6% and a period of variation of 2–3 years. Simultaneous water table observations in this region showed a declining water table, and ground surface observations indicated a slight (5 mm) uplift in the epicenter region relative to its surroundings.

In order to develop an explanation for the observed change of apparent resistivity associated with these great earthquakes, we have used Archie's Law to explore the effects of changes in rock porosity, water content and electrolyte resistivity on measured resistivity.

Tentative conclusions of this study are as follows: (1) the apparent resistivity change is opposite to the effect expected from the simultaneous water table trend; (2) the dilatancy needed to give such resistivity variations (assuming Archie's Law holds) is much larger than that needed to explain the observed uplift (by 2–3 orders of magnitude); (3) salinity change in the pore electrolyte is a possible explanation for the variation in resistivity: an increase in the salinity would cause a proportional decrease in resistivity; the data needed to test this hypothesis, however, are lacking; and (4) the effect of changing geometry of rock pores or cracks due to pressure solution may provide an explanation for the decrease in apparent resistivity; it is different in nature from the effect of a volume change in response to stress although the geometry change is also closely related to the stress change.

Key words

earthquake prediction electrical resistivity 


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  1. Archie, G. E. (1942),The Electrical Resistivity Log as an Aid in Determining Some Reservoir Characteristics, Trans. Amer. Inst. Min. Engrs.146, 54.Google Scholar
  2. Barsukov, O. M. (1972),Variations of Electric Resistivity of Mountain Rocks Connected with Tectonic Causes, Tectonophysics14, 273.Google Scholar
  3. Barsukov, O. M. (1979),A Possible Cause of the Electrical Precursors of Earthquakes, Bull. (Izv.) Acad. Sci. U.S.S.R., Physics of Solid Earth, No. 8.Google Scholar
  4. Brace, W. F. (1974),Electrical Resistivity of Sandstone, Final report to the Defense Nuclear Agency, contract no. DNA-001-74-C-005.Google Scholar
  5. Brace, W. F. (1975),Dilatancy-related Electrical Resistivity Change in Rocks, Pure appl. Geophys.113, 207.Google Scholar
  6. Brace, W. F., andOrange, A. S. (1968a),Electrical Resistivity Changes in Saturated Rocks During Fracture and Frictional Sliding, J. geophys. Res.73, 1433.Google Scholar
  7. Brace, W. F., andOrange, A. S. (1968b),Further Studies of the Effect of Pressure on Electrical Resistivity of Rocks, J. geophys. Res.73, 5407.Google Scholar
  8. Brace, W. F., Orange, a. S., andMadden, T. R. (1965),The Effect of Pressure on the Electrical Resistivity of Water-saturated Crystalline Rocks, J. geophys. Res.70, 5669.Google Scholar
  9. Dakhnov, V. N. (1961),The Application of Geophysical Method: Electrical Well Logging, Colo. Sch. Mines Q.57, 95.Google Scholar
  10. Dunbar, C. O.,The Earth (Weidenfeld and Nicholson, London 1966), p. 69.Google Scholar
  11. Engelder, T. (1982),A Natural Example of the Simultaneous Operation of Free-face Dissolution and Pressure Solution, Geochim. cosmochim. Acta46, 69.Google Scholar
  12. Kasahara, K.,Earthquake Mechanics (Cambridge University Press, Cambridge 1981), pp. 15–22.Google Scholar
  13. Keller, G. V., andFrischknecht, F. C.,Electrical Methods in Geophysical Prospecting (Pergamon Press, New York 1966), pp. 16–33.Google Scholar
  14. Mazzella, A., andMorrison, F. H. (1974),Electrical Resistivity Variations Associated with Earthquakes on the San Andreas Fault, Science, N.Y.185, 855.Google Scholar
  15. Mjachkin, V. I., Brace, W. F., Sobolev, G. A., andDieterich, J. H. (1975),Two Models for Earthquake Forerunners, Pure appl. Geophys.113, 167.Google Scholar
  16. Morrison, H. F., Fernandez, Ricardo, andCorwin, R. F. (1979),Earth Resistivity, Self-potential Variations, and Earthquakes: a Negative Result for M=4.0, Geophys. Res. Letters6, 139.Google Scholar
  17. Parkhomenko, E. I.,Electrical Properties of Rock (English, translation by G. V. Keller) (Plenum Press, New York 1967), pp. 119–184.Google Scholar
  18. Paterson, M. S. (1981),Nonhydrostatic Thermodynamics and its Geologic Applications, Review of Geophysics and Space Physics11, 355.Google Scholar
  19. Qian, J., Gui, X., Ma, H., Ma, X., Guang, H., andZhao, Q., Observations of Apparent Resistivity in Shallow Crust Before and After Several Great Shallow Earthquakes. The contributed paper to the ‘International Symposium on Earthquake Prediction’ (UNESCO, Paris, 2–6 April 1979).Google Scholar
  20. Renton, J. J., Healt, M. T., andCecil, C. B. (1969),Experimental Investigation of Pressure Solution of Quartz, J. sedim. Petrol.39, 1107.Google Scholar
  21. Rikitake, T., andYamazaki, Y. (1969),Electrical Conductivity of Strained Rocks (the Fifth Paper). Residual Strain Associated with Large Earthquakes as Observed by a Resistivity Variometer, Bull. Earthq. Res. Inst. Tokyo Univ.47, 99–105.Google Scholar
  22. Sadovsky, M. A., Nersesov, I. L., Nigmatullaev, S. K., Latynina, L. A., Lukk, A. A., Semenov, A. N., Simbireva, I. G., andUlomov, V. I. (1972),The Processes Preceding Strong Earthquakes in Some Regions of Middle Asia, Tectonophysics14, 295.Google Scholar
  23. Scholz, C. H., Sykes, L. R., andAggarwal, Y. P. (1973),Earthquake Prediction: A Physical Basis, Science, N.Y.181, 803.Google Scholar
  24. Sen, P. N., Scala, C., andCohen, M. H. (1981),A Self-similar Model for Sedimentary Rock with Application to the Dielectric Constant of Fused Glass Beads, Geophysics46, 781.Google Scholar
  25. Sprunt, E. S., andNur, A. (1977),Experimental Study of the Effects of Stress on Solution Rate, J. geophys. Res.82, 3013.Google Scholar
  26. Wang, C.,Characteristics of Variations in Watertable of Deep Wells Before and After Tangshan Great Earthquake. The contributed paper to the ‘International Symposium on Earthquake Prediction’ (UNESCO, Paris, 2–6 April 1979).Google Scholar
  27. Yamazaki, Y. (1974),Coseismic Resistivity Steps, Tectonophysics22, 159–171.Google Scholar
  28. Yamazaki, Y. (1975),Precursory and Coseismic Resistivity Changes, Pure appl. Geophys.113, 219.Google Scholar
  29. Zhang, Z., Xie, J., Xu, F., andPeng, S. (1981),Vertical Deformations Associated with the Tangshan M=7.8 Earthquake, Acta Geophys. Sinica24, 182.Google Scholar

Copyright information

© Birkhäuser Verlag 1985

Authors and Affiliations

  • J. Qian
    • 1
  1. 1.Department of Earth, Atmospheric, and Planetary SciencesMassachusetts Institute of TechnologyCambridgeUSA

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