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A new ionospheric mechanism of electromagnetic ELF precursors to earthquakes

✍ Scribed by N Borisov; V Chmyrev; S Rybachek

Publisher
Elsevier Science
Year
2001
Tongue
English
Weight
117 KB
Volume
63
Category
Article
ISSN
1364-6826

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✦ Synopsis

Generation of whistler mode waves in the ionosphere above seismic zone is discussed. The suggested mechanism involves transformation of electromagnetic noises propagating in the subionospheric waveguide on plasma irregularities excited in the ionosphere prior to earthquakes. Such plasma irregularities have been observed by satellites prior to seismic activity. ELF electric and magnetic ΓΏeld perturbations in the upper ionosphere are obtained and compared with the experimental data. It is shown that the suggested mechanism is able to explain the maximum of signal intensity at the frequencies 200 -500 Hz in accordance with experiments.

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## ABSTRACT The South Iceland Seismic Zone (SISZ) was loaded to failure in June 2000, resulting in two M6.6 earthquakes. The SISZ is an E–W‐trending zone with an overall sinistral movement. Numerical models indicate that, when the SISZ is loaded to failure, there are stress concentrations at its en