POST-PROCESSING OF SEISMIC EVENTS RECORDED BY THE ISTITUTO NAZIONALE DI GEOFISICA SEISMOGRAPH NETWORK: AN ANALYSIS OF THE ACCURACY OF THE MAIN DISSEMINATED SEISMIC PARAMETERS

Abstract

Some of the most significant advances in seismology have resulted from analysis performed on the seismic parameters reported in the Bulletins and disseminated by the seismological data centers. A large fraction of works on travel time residuals and tomography has relied upon arrival times published by the bulletins. A precise estimate of the onset time of seismic phases is needed to obtain accurate event locations necessary for seismological studies of spatial patterns of earthquake hypocenters. To obtain very precise onset times for all seismic signals, seismological data center mostly rely on the picks provided by their human analysts. However, the increase in the number of analysts and the quality of arrivals reported in bulletins has also been debated. We present the results of an analysis aimed to estimate the quality of phase arrivals. A comparison between the arrival times reported in the Istituto Nazionale di Geofisica (ING) bulletins and those retimed in an effort to obtain accurate pickings for a tomographic study is also presented.