GNGTS 2015 - Atti del 34° Convegno Nazionale

etc.) are calculated and listed in the web page. Two kinds of data are considered: unprocessed and processed data. Both kinds of data are in physical units. Processed data are obtained by applying a standard processing procedure including: baseline correction, cosine taper function of 2-5% width in the time domain, pass-band filtering, calculation of Fourier spectrum and signal- to-noise ratio, integration and/or differentiation in order to obtain the displacement, velocity and acceleration time-series, computation of acceleration response spectrum. By selecting the Export Data button, the user downloads a zip file that contains, for each component, the unprocessed data as well as the processed displacement, velocity and acceleration time series, the acceleration Fourier spectra and the 5% damped acceleration response spectra, for a total of 19 files. Files are in ASCII format with a header of 43 commented rows that reports the most relevant information about station, event and waveform parameters [the 43 fields are the same adopted in ITACA and described in Pacor et al . (2011)]. As can be seen in Tab. 1, data belonging to networks NI and EV are provided in Continuous Waveform mode while stations belonging to networks BA provide Event Waveforms . In Fig. 2 we show as an example the recording of the M=3.6, 2014-08-28 17:49:19 event at the Mirandola (MIRB) vertical array station (from top to bottom, z=0, 31 and 126 m depth). It can be seen as the amplitude and the duration of signals increase significantly from the bottom upwards, as the effect of surface soil amplification. Recently, both Mirandola (MIRB) and Casaglia (FERB) stations data have been used in studies for the evaluation of the local geophysical model and of the spectral amplification in the lack of a real reference site on rock in alluvial plain areas (Laurenzano et al ., 2013, 2015). Fig. 2 – Recordings of the M=3.6, 20140828174919 event at different depths (from top to bottom: z=0, 31 and 126 m). From left to right: vertical, EW and NS components. Values are reported in counts. GNGTS 2015 S essione 2.2 139