Physics
Scientific paper
Aug 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987pepi...47...25d&link_type=abstract
Physics of the Earth and Planetary Interiors, Volume 47, p. 25-42.
Physics
15
Scientific paper
The seismic activity that occurred at the Phlegraean Fields (Southern Italy) volcanic area during a pronounced episode of ground uplift has been analysed. One hundred and eighty-one three component seismograms from a digital network operating in the period January-May 1984 were processed to obtain seismic moments, source radii and stress drops for 32 microearthquakes (0.7 < ML < 3.2). An inverse method based on a least squares fitting of displacement spectra with a theoretical model has been applied to infer the spectral parameters of P-radial and SH records. This method has the advantage of giving statistical errors on the spectral estimates. The computed seismic moments range between 0.5 × 1018 and 0.13 × 1021 dyne-cm. Stress drops are approximately constant, and do not clearly depend on seismic moments, which is in contrast with other reported data from microearthquake sequences. Small values of source radii (few tens of metres) are found.
de Natale Giuseppe
Del Pezzo Edoardo
Martini Marcello
Zollo Aldo
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