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Estimate of ULF electromagnetic noise caused by a fluid flow during seismic or volcano activity
- Source :
- Annals of Geophysics, Vol 58, Iss 6 (2016)
- Publication Year :
- 2016
- Publisher :
- Instituto Nazionale di Geofisica e Vulcanologia, INGV, 2016.
-
Abstract
- The elaboration of theoretical models, even oversimplified, capable to estimate an expected electromagnetic effect during earthquake preparation process is not less important than the advancement of observational technique to detect seismic-related electromagnetic emission. Here possible mechanisms of ULF electromagnetic noise associated with seismic or volcanic activity are discussed. The electrokinetic (EK) and magnetohydrodynamic (MHD) effects due to an irregular flow of conducting rock fluid or magma flow are being revised. The conventional theory of EK effect in a water-saturated rocks has been advanced by consideration of elliptic-shaped channels. A contribution of both mechanisms to observed ULF signal on the ground is shown to be dependent on the pore channel size/rock permeability. Estimates of magnetic and telluric perturbations caused by magma motion along a volcano throat indicate on the important role of the surrounding rock conductivity. These estimates have proven that the mechanisms under consideration are able to generate ULF electromagnetic emission which could be detected by modern magnetometers under favorable conditions.
- Subjects :
- Onsager reciprocal relations
Magnetometer
Magma
Flow (psychology)
lcsh:QC851-999
010502 geochemistry & geophysics
01 natural sciences
Electrokinetic effect
Physics::Geophysics
law.invention
law
Fluid dynamics
Volcano activity
Magnetohydrodynamic drive
0105 earth and related environmental sciences
geography
geography.geographical_feature_category
Geomagnetic perturbations
lcsh:QC801-809
Geophysics
lcsh:Geophysics. Cosmic physics
Permeability (earth sciences)
Volcano
lcsh:Meteorology. Climatology
Magnetohydrodynamics
Seismology
Geology
Subjects
Details
- ISSN :
- 2037416X, 15935213, and 16849981
- Volume :
- 58
- Database :
- OpenAIRE
- Journal :
- Annals of Geophysics
- Accession number :
- edsair.doi.dedup.....7ac28cfbc6c638323bfa5f9fb4422c0a