Earthquake Early Warning Systems, P. Gasparini et al. editors, Springer, 2007
Aldo Zollo and Maria Lancieri
A prototype system for earthquake early warning and rapid shake map evaluation is being developed and tested in southern Italy based on a dense, wide-dynamic seismic network (accelerometers + seismometers) under installation in the Apenninic belt region (Irpinia Seismic Network).
It can be classified as a regional Earthquake Early Warning Systems consisting of a wide seismic sensor network covering a portion or the entirearea which is threatened by quake's strike. The real time magnitude estimate will take advantage from the high spatial density of the network in the source region and the wide dynamic range of installed instruments. Based on the o ine analysis of high quality strong-motion data bases recorded in Italy, several methods envisaged, using different observed quantities (peak amplitude, dominant frequency, square velocity integral, . . . ) to be measured on seismograms, as a function of time, either on on P and early-S wave signals.
Results from the analysis of the italian strong motion data-base, point out the possibility of using low-pass filtered displacement and velocity peak amplitudes measured in time windows lasting less than 3-4 sec after the first P or S wave arrivals. These parameters show to be robustly correlated with moment magnitude.