Strong motion data from significant earthquakes recorded over the period 1975-1985 are analyzed. An inversion procedure has been developed for studying accelerometer data in the frequency domain and for estimating some basic earthquake source parameters. Spectral models, characterized by a single or two corner frequencies have been tested by utilizing variable high frequency decay parameters to simulate a variety of attenuation and rupture models. A best fit of available data was obtained for mid-crustal Q values around 100-250, decay parameter γ in the range 2-3 and a model consisting of two corner frequencies. The data analyzed are confined to the seismic moment range 1015-1019 Nm, with stress drops 100-200 bars (1bar = 0.1M Pa). -from Author
Strong ground motion and source parameters for earthquakes in the Apennines, Italy
Capuano P.;Scarpa R.
1992
Abstract
Strong motion data from significant earthquakes recorded over the period 1975-1985 are analyzed. An inversion procedure has been developed for studying accelerometer data in the frequency domain and for estimating some basic earthquake source parameters. Spectral models, characterized by a single or two corner frequencies have been tested by utilizing variable high frequency decay parameters to simulate a variety of attenuation and rupture models. A best fit of available data was obtained for mid-crustal Q values around 100-250, decay parameter γ in the range 2-3 and a model consisting of two corner frequencies. The data analyzed are confined to the seismic moment range 1015-1019 Nm, with stress drops 100-200 bars (1bar = 0.1M Pa). -from AuthorI documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
