Figure 3
From: Short-term detection of volcanic unrest at Mt. Etna by means of a multi-station warning system
Images of thermal video cameras documenting eruptive activity at NEC (a) and NSEC (b) on 9 and 11 August 2014, respectively. The DEM (in the middle of the figure) depicts the location of three seismic stations (EPLC, ECNE, and ECPN) and Etna summit craters. Temporal variations of the red and green components of SOM at the three stations are depicted in (c–e). Black triangles mark the time period of the images shown in (a,b), respectively. The DEM is owned by INGV (http://geodb.ct.ingv.it); geographical coordinates are expressed in UTM projection, zone 33 N. The DEM was realized by the “Laboratorio di Aerogeofisica” of INGV Sezione Roma 2 exploiting aerial images taken during a helicopter survey and processed by “Agisoft Photoscan Pro v.1.2”, a software for SfM photogrammetry33.
