Abstract
Based on systematic processing to long-term geoelectric observation data, we mainly studied the character of earth resistivity tendency anomaly for M S>7.0 strong earthquakes and its relation with seismogenic process. The character of quick descending at early stage and then slow development with steady shape in geoelectricity is a basic feature of geoelectric tendency anomaly for strong earthquake. Usually the ratio of average time between the early quick descend stage and the post slow development stage is about 1:4. In addition, for Tangshan M S=7.8 and Songpan M S=7.2 earthquake, we studied the diffusion character of the geoelectric tendency anomaly development. For Tangshan earthquake, we also studied the time-space-strength dynamic evolution character of its geoelectric precursory information quantity. The results showed that diffusion velocity of geoelectric precursory tendency anomaly for the two earthquakes is respectively 90 km/a and 100 km/a. The variation character of geoelectric tendency anomaly presents some indexes for judgment of strong earthquake tendency background and intermediate-term prediction.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
Chen Y. 1988. Use of Fractal and Fractal Dimension in Geophysics Science. Beijing: Academic Books and Periodical Press, 28–29 (in Chinese)
Editorial Group for 1976 Tangshan Earthquake of China Seismological Bureau. 1982. 1976 Tangshan Earthquake. Beijing: Seismological Press, 172–173 (in Chinese)
Mei S R, Feng D Y, Zhang G M, et al. 1993. Introduction of China Earthquake Prediction. Beijing: Seismological Press, 250 (in Chinese)
Niu Z R. 1978. Tectonic earthquake’s precursor theory. Acta Geophysica Sinica, 21(3): 206–207 (in Chinese)
Niu Z R, Chen D M. 1987. Slip-weakening instability on a strike-slip fault with asperity. Acta Seismologica Sinica, 1(3): 31–43
Qian F Y, Zhao Y L, Yu M M, et al. 1982. Earth resistivity anomaly variation before an earthquake. Scientia Sinica (Series B), (9): 833–851 (in Chinese)
Seismological Bureau of Sichuan Province ed. 1979. 1976 Songpan Earthquake. Beijing: Seismological Press, 18–20 (in Chinese)
Wang X D, Guan H P. 1993. Earth resistivity anomaly and geoelectric station site — study on relation of device condition. Acta Seismologica Sinica, 6(1): 181–189
Wang Z X. 1990. Primary study on earth resistivity anomaly character of some earthquakes and the relation with seismic three key elements. In: The Department of Scientific Technological Monitoring of China Seismological Bureau eds. Miscellany of Study on Practical Earthquake Prediction Method — Geoelectricity and Geomagnetism Edition. Beijing: Academic Books and Periodical Press, 257–260 (in Chinese)
Wang Z X, Peng Y Q, Wang L. 1990. Study on judgment method of earth resistivity short term precursor anomaly. Earthquake, (1): 88–95 (in Chinese)
Wang Z X, Peng Y Q, Zheng W K. 1994. Study on mutation of Tangshan earthquake’s earth resistivity at the quake time and its precursor Mark. Earthquake Research in China, 13(2): 189–195 (in Chinese)
Zhang G M, Fu Z X. 1990. From rock destabilization to discuss the complexity of earthquake precursor. Journal of Seismological Research, 21(3): 220–221 (in Chinese)
Author information
Authors and Affiliations
Additional information
This is one of the special subject of Key Project (95-04-01-01-09) for earthquake prediction in ‘Ninth Five-Year Plan’.
About this article
Cite this article
Wang, ZX., Zhang, XM., Li, YQ. et al. Character of geoelectric intermediate term precursory anomaly and judgment for intermediate term tendency of strong earthquake. Acta Seimol. Sin. 12, 207–214 (1999). https://doi.org/10.1007/s11589-999-0026-1
Received:
Revised:
Accepted:
Issue Date:
DOI: https://doi.org/10.1007/s11589-999-0026-1