Wspólnotowy Serwis Informacyjny Badan i Rozwoju - CORDIS

A European test site for earthquake precursors and crustal activity: the gulf of Corinth, Greece

An integrated study is being made of crustal instabilities and earthquake precursors in the most seismic, continental region of Europe: the Gulf of Corinth, Greece. The project contributes of defining optimal methodologies in terms of instrument, site selection, data analysis and physical modelling for the detection and understanding of seismic and aseismic crustal instabilities. More than 100 sensors have been installed in multiparameter sites with continuous monitoring: telemetered seismometers; accelerometers; tiltmeters and straimeters in caves and in shallow boreholes; radon probes, near active faults and in springs; magneto-telluric and radio stations; meteorological sensors. Incoming data is presently being analysed for noise removal, and decorrelated from meteorological factors. Low-cost, new technologies have been used for allowing the installation of a large number of instruments. For the sensitive tiltmeters (noise 10-8 radians), an installation technique has been developed and successfully tested for shallow boreholes (10 m), which requires a simple mechanical control from the surface, thus suppressing the need of costly, built-in electromechanical devices standard tiltmeters normally need to bring the sensor into a near-vertical position. Prototypes of hydrogen probes for soil or borehole measurements with good sensitivity and stability have been developed and are operational. Prototypes of self-calibrating, intrinsically stable, sensitive tide-guages have been installed and are operational. The microdas acquisition system proves a very reliable, easy-to-use recording device for slowly varying signals (meteorological factors, tiltmeters, tide etc). It is the first time this has been used for monitoring tectonic processes.

Reported by

Institut de Physique du Globe de Paris (IPGP)
Place Jussieu 4
75252 Paris
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