Abstract
Strong ground-shaking mapping soon after a moderate-to-large earthquake
is crucial to recognize the areas that have suffered the largest
damage and losses. These maps have a fundamental role for emergency
services, loss estimation and planning of emergency actions by the
Civil Protection Authorities. This is particularly important for
areas with high seismic risk levels, such as the Campania-Lucania
Region in southern Italy. Taking advantage of the Irpinia Seismic
Network (ISNet), a recently installed dense and wide dynamic seismic
network, we have developed a procedure for rapid estimation of ground-shaking
maps after moderate-to-large earthquakes (GRSmap). This uses an optimal
data gridding scheme designed to account for bi-dimensional features
of strong ground-motion fields, such as directivity, radiation patterns
and focal mechanisms, to which most damage can be correlated. The
basis of the mapping technique is a triangulation procedure to locally
correct predicted data at the triangle barycentres where their vertices
correspond to seismic stations. The method has been tested off-line
using a simulated M 6.6 earthquake located at the centre of ISNet
and applied to data of the 23 November 1980 Irpina M 6.9 earthquake
recorded by a sparse network. This has highlighted its ability to
predict peak ground-motion parameters of large magnitude earthquakes
with respect to the attenuation relationships.
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