Electric and magnetic fields generated by electrokinetic processes in a conductive crust

Abstract The results of different models of electrokinetic sources of ULF disturbances, mostly based on numerical calculations, can be reproduced with a much simpler analytical model of an elliptic-shaped inhomogeneity. The suggested model can be applied to the estimates of electromagnetic fields from elementary sources of different geometries. Moreover, this model enables one to estimate the screening effect of the back conductivity currents and the influence of the ground-atmosphere boundary. The estimates show that the expected magnitudes of seismo-electromagnetic signals in ULF band from an elementary electrokinetic source may reach the detection level only for rather favorable set of crustal parameters.

[1]  T. Ishido,et al.  Electrokinetic phenomena associated with earthquakes , 1976 .

[2]  David V. Fitterman,et al.  Electrokinetic and magnetic anomalies associated with dilatant regions in a layered Earth , 1978 .

[3]  V. Pilipenko,et al.  Magnetic effects due to earthquakes and underground explosions: a review , 1997 .

[4]  ULF magnetic signatures at the earth surface due to ground water flow - A possible precursor to earthquakes , 1991 .

[5]  M. Ladd,et al.  Low‐frequency magnetic field measurements near the epicenter of the Ms 7.1 Loma Prieta Earthquake , 1990 .

[6]  T. Ishido,et al.  Experimental and theoretical basis of electrokinetic phenomena in rock‐water systems and its applications to geophysics , 1981 .

[7]  D. Patella,et al.  Basic theory of electrokinetic effects associated with earthquakes , 1991 .

[8]  Kiyohumi Yumoto,et al.  ULF electromagnetic precursors for an earthquake at Biak, Indonesia on February 17, 1996 , 2000 .

[9]  O. G. Villard,et al.  ULF magnetic field measurements near the epicenter of the Ms 7.1 Loma Prieta earthquake , 1991 .

[10]  Masashi Hayakawa,et al.  Generation of ULF electromagnetic emissions by microfracturing , 1995 .

[11]  Kiyohumi Yumoto,et al.  Results of ultra-low-frequency magnetic field measurements during the Guam Earthquake of 8 August 1993 , 1996 .

[12]  M. Gokhberg,et al.  Modelling the connection between earthquake preparation processes and crustal electromagnetic emission , 1989 .

[13]  H. Murakami.  Geomagnetic fields produced by electrokinetic sources. , 1989 .

[14]  Modeling of non-stationary electrokinetic effect in a conductive crust , 1997 .

[15]  W. Boerner,et al.  Observations of seismo-electromagnetic earthquake precursor radiation signatures along Southern Californian fault zones: Evidence of long-distance precursor ultra-low frequency signals observed before a moderate Southern California earthquake episode , 1991 .

[16]  A. Fraser-Smith,et al.  Ultra‐low frequency magnetic field measurements in southern California during the Northridge Earthquake of 17 January 1994 , 1994 .

[17]  F. Dale Morgan,et al.  Electromagnetic precursors to earthquakes in the Ulf band: A review of observations and mechanisms , 1993 .

[18]  Yu. A. Kopytenko,et al.  Detection of ultra-low-frequency emissions connected with the Spitak earthquake and its aftershock activity, based on geomagnetic pulsations data at Dusheti and Vardzia observatories , 1993 .

[19]  David V. Fitterman,et al.  Theory of electrokinetic‐magnetic anomalies in a faulted half‐space , 1979 .

[20]  J. Zlotnicki,et al.  Possible electrokinetic origin of large magnetic variations at La Fournaise volcano , 1990, Nature.

[21]  D. V. Fitterman,et al.  Correction to ‘Theory of electrokinetic-magnetic anomalies in a faulted half-space’ , 1981 .

[22]  M. Gokhberg,et al.  Sources of Electromagnetic Emissions Preceding Seismic Events , 1987 .

[23]  J. Byerlee,et al.  Magnetic and electric fields associated with changes in high pore pressure in fault zones : Application to the Loma Prieta ULF emissions , 1995 .