Abstract. Campi Flegrei caldera (Southern Italy) is one of the most
hazardous volcanic complexes in the world since it is located inside the
densely inhabited urban district of Naples-Pozzuoli. In the past, the
caldera has produced devastating to moderate eruptions and periodically
undergoes from strong to minor uplift episodes, named “bradyseism”, almost
always accompanied by seismic swarms. Starting from 2005 Campi Flegrei has
undergone an unrest crisis, characterized by ground uplift, localized gas
emissions and seismicity, often occurring in seismic swarms. As a
consequence, the monitoring activities have been progressively increasing,
producing a huge amount of data, difficult to manage and match. GIS
(Geographical Information System) represents a potent tool to manage great
quantity of data, coming from different disciplines. In this study, we show
two GIS technology applications to the seismic catalogue of Campi Flegrei.
In the first one, a high-quality dataset is extracted from the GeoDatabase addressed to
seismological studies that require high precision earthquake locations. In
the second application, GIS are used to extract, visualize and analyse the
typical seismic swarms of Campi Flegrei. Moreover, density and seismic
moment distribution maps were generated for these swarms. In the last
application, the GIS allow to highlight a clear variation in the temporal
trend of the seismic swarms at Campi Flegrei.
A high-resolution Digital Terrain Model (DTM) of Campi Flegrei caldera, obtained from an airborne LiDAR mission, has been analyzed in order to produce a 1:20,000-scale morphometric map of this volcanic area. The map consists of different thematic layers, which include: profile curvature, terrain ruggedness index, elevation range, as well as an upto-date structural map and building distribution in the densely populated area. Results evidence that most of the relief is related to the occurrence of tuff-cones, tuff-ring, and the outer flanks of the caldera. Higher values of elevation characterize the upper portions of cones, while higher terrain ruggedness index values concentrate on the inner flanks of cones and in areas affected by gravity and erosional processes. The map also evidences the topographic expression of crater rims and of the major morphological scarps, which reflect ancient and uplifted shorelines and present-day cliffs.
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