References

NHESS

Natural Hazards and Earth System Sciences

NHESS

Nat. Hazards Earth Syst. Sci.

1684-9981

Copernicus Publications

Göttingen, Germany

10.5194/nhess-6-741-2006

On Es-spread effects in the ionosphere connected to earthquakes

Liperovskaya

E. V.

¹ Meister

C.-V.

² Pokhotelov

O. A.

¹ Parrot

³ Bogdanov

V. V.

⁴ Vasil'eva

N. E.

Institute for Physics of the Earth, 123995 Moscow, Russia

High School and Science Programme Brandenburg/Potsdam, Project "Physics of Stellar and Planetary Atmospheres", 14482 Potsdam, Germany

L.P.C.E./C.N.R.S., 3A, Avenue de la Recherche Scientifique, 45071 Orléans Cedex 2, France

Inst. of Cosmophysical Research and Radio Wave Propagation, Far Eastern Branch of RAS, 684034 P-Kamchatsky, Russia

22 08 2006

6 5 741 744

2006

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In the present work, phenomena in the ionosphere are studied, which are connected with earthquakes (16 events) having a depth of less than 50 km and a magnitude <i>M</i> larger than 4. Analysed are night-time Es-spread effects using data of the vertical sounding station Petropavlovsk-Kamchatsky (φ=53.0°, λ=158.7°) from May 2004 until August 2004 registered every 15 min. It is found that the maximum distance of the earthquake from the sounding station, where pre-seismic phenomena are yet observable, depends on the magnitude of the earthquake. Further it is shown that 1–2 days before the earthquakes, in the pre-midnight hours, the appearance of Es-spread increases. With a probability of more than 0.95, this increase of Es-spread observations before midnight is not casual.

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