The present study focuses on a Gis-based strategy to draw
Seismic Micro-zoning instability maps in landslide-prone urban areas. As
concerns landslide prevention and mitigation policies at the urban scale, the
ability of Geographical Information Systems (GIS) to combine multi-layered information
with high precision enables technicians and researchers to devote efforts to
managing multiple hazards, such as seismically induced instability in urbanized
areas. Gis-based Newmark's method is traditionally used for measuring the
permanent displacements caused by seismic activity on natural slopes at
regional and municipal scales.
Hereinafter, the case study of Castelfranci city (Campania, southern
Italy) has been studied. This small town, hosting two thousand inhabitants,
suffers from the seasonal reactivation of landslides in clayey soil deposits
due to rainfall but it is exposed to a high seismic hazard. This study
investigates possible seismically induced hazard scenarios within the
Castelfranci municipal territory aimed at estimating the slope permanent
displacements triggered by the strongest historical seismic event that hit this
area: the 1980 Irpinia earthquake. Two simplified relationships relating peak
ground acceleration and Arias intensity to permanent displacements have been
used and compared. Both equations gave similar permanent displacement values:
the two analyses pointed out that multiple portions of both active and
quiescent landslide bodies within the Castelfranci urban area can be moved by
tens of centimeters generating a high-risk scenario for structures and persons.
Author(s) Details:
G. Vessia,
University “G. D’Annunzio” of Chieti-Pescara, Chieti Scalo, Italy.
M. Parise,
University
“Aldo Moro”, Barii, Italy.
G. Tromba,
ANAS S.pA., Cagliari, Italy.
Please see the link here: https://stm.bookpi.org/RAEGES-V2/article/view/14206
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