1,721,122 research outputs found
Variations in the relationship of seismic velocities before two earthquakes in Umbria (Italy)
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Risultati preliminari di possibili effetti elettromeccanici non lineari in campioni di roccia
No full textEARTHQUAKE PRECURSOR RESEARCH: GROUND-SATELLITE OBSERVATIONS, LABORATORY EXPERIMENTS, AND THEORETICAL MODELS PREFACE
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The European VLF/LF radio network: current status
No full textFor several years researches about correlation between seismicity and disturbances
in radio broadcasting are being carried out: in particular, the Japanese Pacific VLF radio
network and the European VLF–LF radio network have been developed during the last
years. The European network has been developed starting from two LF receivers located in
central Italy in 1996. Up to now, 11 receivers of a new type, able to sample the VLF and LF
intensity of ten radio signals, are being into operation in different European countries. The
daily updating of data is effective and the data bank is located at the Department of Physics
of the University of Bari (Italy) which is the central node of the network. In order to discover
anomalies, the software able to carry out automatically a daily data analysis by the Wavelet
spectra method has been planned and realized. At the moment, the software operates on four
signals (two LF and two VLF) collected by one of the receiver located in Italy. If the anomaly
is particularly strong a warning system gives an advise on the work station into operation
in the central node of the Network. In any case, before assuming an anomaly as a seismic
anomaly, geomagnetic and meteorological data must be checked as well as any possible
instrumental malfunction. At present these controls are carried out only discontinuously by
the researchers of the Bari Team
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