Ultra low frequency geomagnetic field measurements during earthquake activity in Italy (September-October 1997)

U. Villante, M. Vellante, A. Piancatelli

Abstract


Different methods with different results have been proposed in the scientific literature to identify the possible occurrence of weak seismo-magnetic ULF emissions. In September-October, 1997 Central Italy was struck by repeated seismic activity (M L < 5.8). A simple amplitude analysis of the geomagnetic field variations (horizontal components, in the frequency range 4-100 mHz) at a geomagnetic facility located 65-85 km from epicenters of major earthquakes does not reveal in this case any clear evidence for possible ULF emissions.

Keywords


ULF emission;earthquake precursors

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References


DOI: https://doi.org/10.4401/ag-3594
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Published by INGV, Istituto Nazionale di Geofisica e Vulcanologia - ISSN: 2037-416X