The correlation of peak ground horizontal acceleration with magnitude, distance, and seismic intensity for Friuli and Ancona, Italy, and the Alpide Belt

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Abstract
A new sample of strong-motion data has been analyzed in this paper: namely 120 records from the 1976 Friuli earthquake, 40 from the 1972 Ancona swarm, and 64 from different Alpide Belt shocks. The sample is the result of the selection of peak recorded horizontal acceleration of every three-component record greater than 0.015 g. Linear regressions were applied to the data with the purpose of understanding the geography and the site-dependence. Separate analyses have been carried out, firstly taking into account acceleration (a), magnitude (ML), and distance (d), then computing a - IMM relationships and comparing the respective standard errors of the estimates. Finally, a - ML - d - IMM regressions for the total sample from Friuli, Ancona, and the Alpide Belt have been computed. The main result are

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