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Relationship between earthquake dilatancy and electric precursor phenomena

Author

Listed:
  • Wei Wang
  • Jianxin Shan
  • Zhensong Ni
  • Juntao Cai

Abstract

The nature of electromagnetic phenomena before an earthquake is associated with the excitation of the natural electromechanical transformation. This study investigated the impact of the relationship between the stress–strain and the dilatancy process on the electromagnetic phenomena and evaluated the relationship between electromagnetic changes and the seismogenic process. The impact of the change of the crustal stress field over time on the resistivity was analyzed. The ground displacement and pore pressure variation were calculated to simulate the variation characteristics of pre-earthquake electromagnetic waves according to stress. The changes in the crustal rock resistivity caused by the change in the crack aspect ratio due to the stress field were investigated as were the impacts of the dilatancy process on the waveform characteristics and frequency range of the electromagnetic signals. The relationships between the frequency and amplitude of electromagnetic radiation and the epicentral distance and strain were obtained. Apparent resistivity changes under small strain during the dilatancy stage of an impending earthquake are closely related to the voidage change. The rapid development and interconnections of microfissures and conductive fluid activity are the major causes of electrical change. The electromagnetic radiation frequency increases with the elastic modulus and decreases with the hypocenter size and intensity. The accumulation and release of the typical strain associated with major earthquakes give rise to a change in the medium resistivity, which in turn significantly changes the apparent resistivity. The crustal resistivity change may provide a sensitive method for studying the crustal properties during the dilatancy. Copyright Springer Science+Business Media Dordrecht 2015

Suggested Citation

  • Wei Wang & Jianxin Shan & Zhensong Ni & Juntao Cai, 2015. "Relationship between earthquake dilatancy and electric precursor phenomena," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 79(1), pages 249-262, October.
    • Handle: RePEc:spr:nathaz:v:79:y:2015:i:1:p:249-262
    DOI: 10.1007/s11069-015-1839-y
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