Abstract
Tectonomagnetic field observations from absolute magnetic field level measurements were undertaken in Central Italy in an area extending between latitude 41°N and 43°N and between longitude 13°E and 15°E. Moreover,natural electromagnetic signals from a system of two VLF search coil wide-band antennas were collected at the geomagnetic observatory of L Aquila (42o23'N, 13o19'E). The analysis of these data allowed the investigation of the electromagnetic properties of the study area at different time and spatial lengthscales. Tectonomagnetic field observations were obtained comparing data simultaneously recorded at three magnetometer stations using L'Aquila Observatory as a reference for differentiation. We report on the time evolution of magnetic and electromagnetic indicators related to local and regional seismic activity.
Highlights
Magnetic and electromagnetic field natural signals are monitored in seismogenic areas in the search for possible correlations with seismic activity
This paper reports the results of the analysis of data coming from two subsets of electromagnetic investigations, the so-called tectonomagnetic field observations and VLF natural electromagnetic field waves observation
A moderate seismicity occurred in the study period and sometimes anomalies have been detected from this network, there is no clear evidence of a one-to-one relation between magnetic anomalies and seismic events
Summary
Magnetic and electromagnetic field natural signals are monitored in seismogenic areas in the search for possible correlations with seismic activity. This field of investigation covers phenomena that vary on a very wide range of frequencies from DC to VHF. We will refer in this paper to measurements in the VLF band only In this band transient signals and noise are generated by various natural and artificial phenomena of which radio atmospherics (or sferics for short and sometime statics) are one kind of typical impulsive electromagnetic signals that can propagate in the atmosphere for thousand kilometers. Electromagnetic waves at ELF and VLF frequencies related to earthquakes were detected from satellite instrumentation, see for example Molchanov et al (1993) and Parrot (1994)
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