Abstract
We examine here a number of parameters that define the source of the earthquake that occurred on 23rd July 1930 in Southern Italy (in the Irpinia region). Starting from the source models proposed in different studies, we have simulated the acceleration field for each hypothesized model, and compared it with the macroseismic data. We then used the hybrid stochastic-deterministic technique proposed by Zollo et al. (1997) for the simulation of the ground motion associated with the rupture of an extended fault. The accelerations simulated for several sites were associated with the intensities using the empirical relationship proposed by Trifunac and Brady (1975), before being compared with the available data from the macroseismic catalogue. A good reproduction of the macroseismic field is provided by a normal fault striking in Apenninic direction (approximately NW-SE) and dipping 55° toward the SW.
Highlights
At 00:08 UTC on 23rd July 1930, a seismic event completely destroyed several villages (Villanova del Battista, Trevico, Aquilonia and Lacedonia) in the Campania Region of Southern Italy, causing the loss of about 1500 lives
The residuals of the P arrival times reported for some close seismic stations in Inferences on the source mechanisms of the 1930 Irpinia (Southern Italy) earthquake the bulletin amount to several tens of seconds
There have been several studies of the geometry of the fault-plane of the 1930 Irpinia earthquake that have evaluated the focal mechanisms by P-wave polarities or that have applied semi-empirical relationships to macroseismic data
Summary
At 00:08 UTC on 23rd July 1930, a seismic event completely destroyed several villages (Villanova del Battista, Trevico, Aquilonia and Lacedonia) in the Campania Region of Southern Italy, causing the loss of about 1500 lives. Ground motion simulation techniques aim to provide more exact predictions of the ground shaking than those obtained, for example, from conventional seismotectonic analyses and/or from the use of empirical peak attenuation relationships. These can be realised through the calculation of reliable earthquake scenarios. Study, simulation of the seismic radiation can be considered a useful approach in the validation of a source model proposed on the basis of seismological, geological and geophysical data. We propose a new model for this earthquake source
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