Spectral frequency envelopes related to VLF/ELF emissions observed by ICE experiment on board the DEMETER micro-satellite
Abstract
It is well know since several decades that electromagnetic effects, like the electric and magnetic perturbations, are caused by natural geophysical activity such as earthquakes and volcanic eruptions. It includes: electromagnetic emissions in a large frequency range,perturbations of ionospheric layers, anomalies on the records of VLF transmitter signals, and night air-glow observations. Such phenomena, called seismo-electromagnetic phenomena, can be considered as short term precursors because they occur between few hours and/or days before the shock. Two papers published by Gokhberg et al. (1982) and Warwick et al. (1982) advanced the investigation of the seismo-electromagnetic effects. Authors reported earthquakes events which were accidentally recorded by experiments not devoted to this study. Also they detailed observations of various parameters measured in the atmosphere or in the ionosphere in relation with seismic activity.
- Publication:
-
In 4th International Conference "Solar-Terrestrial Bonds and Earthquake Precursors
- Pub Date:
- July 2007
- Bibcode:
- 2007stbe.conf..363B