On the occasion of the 150th anniversary of the Unit? of Italy the Laboratory of digital cartography and geographic information systems of the Irpinia branch of the National Institute of Geophysics and Volcanology (INGV) wanted to commemorate 150 years of seismic history in Italy with the creation of a commemorative map.
The map ? available from 17 March in pdf format on the website of the INGV Irpinia branch (www.gm.ingv.it) and soon it will be? also printed.
April 15, 2011
Among the initiatives for the celebration of the 150th anniversary of the Unit? of Italy, the National Earthquake Center of the National Institute of Geophysics and Volcanology (INGV) wanted to create a seismicity map using the tricolor as a chromatic scale to highlight the depth of the hypocentres.
The map shows the hypocenters of some tens of thousands of earthquakes recorded by the National Seismic Network between 1980 and 2010 (Catalogue of Italian Seismicity, csi.rm.ingv.it/; CSI 2.0 will be released soon). Most earthquakes have a magnitude Ml<4.0 and ? located in the first 10 km of the earth's crust (green colours). The hypocentres are arranged along a main seismic band, stretched throughout the Apennines, the colors show how the seismicity deepens going towards the Adriatic. Elevated seismic release is also evident in active volcanic zones (e.g. Mt. Etna), off northern Sicily and along the western and eastern Alps. An area of concentration of intermediate and deep earthquakes (up to over 300 km; red colours) ? present in the southern Tyrrhenian Sea in relation to the subduction process of the Ionian lithosphere under the Calabrian arc. The map ? available as pdf (16 Mb)