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UID:pretalx-foss4g-it-2023-ZBULVA@talks.staging.osgeo.org
DTSTART;TZID=GMT:20230613T153000
DTEND;TZID=GMT:20230613T154500
DESCRIPTION:The geological processes that occur several kilometers below th
 e earth's surface\, such as displacement along a seismogenic fault\, press
 ure variation in magma reservoirs and landslides\, in many cases cause def
 ormations of the earth's surface that can be measured with geodetic method
 s and remote sensing techniques\, such as differential SAR interferometry 
 (DInSAR). DInSAR is a consolidated microwave remote sensing technique whic
 h\, by exploiting two satellite images acquired at different times\, makes
  it possible to estimate the surface deformations that occurred between th
 e two acquisitions with centimeter precision. DInSAR systems are able to r
 evisit the same area at regular intervals\, providing very high spatial re
 solution information of the observed scene. For example\, ESA ERS 1/2 and 
 Envisat satellites\, active since 1992\, have a revisit time of 35 days\, 
 the sensors of the Italian COSMO-SkyMed constellation\, have a revisit tim
 e of 8 days\, and finally this time was reduced to 6 days for the "Sentine
 ls" of the European Copernicus programme. These measurements are indicated
  by a series of colored bands\, the so-called fringes or interferograms. T
 he electromagnetic waves used are characterized by an alternation of crest
 s spaced a few cm apart. By "counting" these crests\, the radar is able to
  figure out how far the object being observed has moved\; if the object is
  hundreds of kilometers away\, moving only a few centimeters\, the number 
 of crests that characterize the electromagnetic waves will change\, allowi
 ng the displacement to be accurately detected and measured with centimeter
  accuracy.\nInterferometric techniques produce not only surface deformatio
 n maps measured along the sensor's line of sight\; indeed\, by exploiting 
 a series of images acquired over time\, it is possible to follow the tempo
 ral evolution of the deformation. This information can be particularly val
 uable\, for example\, for measuring ground deformation in volcanic areas\,
  as this parameter can be a precursor to the resumption of eruptive activi
 ty or the increase of the unrest phenomena. If we consider that the first 
 satellites (ERS-1) used for this purpose have been collecting data since 1
 992\, the history of deformation of a volcano over the last 30 years can b
 e analyzed in previously unimaginable detail.\nThe main results obtained i
 n recent years in various geological contexts will be presented. For examp
 le in the volcanic context\, using the DInSAR technique and benefiting fro
 m the availability of long-term SAR archives\, it was possible to detect a
 nd monitor the evolution of the surface deformation of the Campania volcan
 oes (Campi Flegrei\, Vesuvio and Ischia) and\, with geophysical inversion\
 , identify and analyze the deep sources responsible for the observed defor
 mation. In the context of hydrogeological instability\, by way of example\
 , we will present a study conducted on the Ivanchic landslide in Umbria ch
 aracterized by a relatively slow movement\, which starting from satellite 
 data and with geological\, geotechnical and geophysical knowledge\, has al
 lowed us to characterize the geometry and the detachment surface of the la
 ndslide. Finally\, some examples of applications of these techniques to id
 entify deformations of infrastructures\, such as buildings\, dams\, viaduc
 ts\, will be illustrated in the urban context.
DTSTAMP:20260512T203409Z
LOCATION:Sala Videoconferenza @ PoliBa
SUMMARY:The use of satellite data for the knowledge of the territory: geolo
 gical applications - Giuseppe Solaro\, Andrea Barone\, Raffaele Castaldo\,
  Vincenzo De Novellis\, Antonio Pepe\, Susi Pepe\, Pietro Tizzani
URL:https://talks.staging.osgeo.org/foss4g-it-2023/talk/ZBULVA/
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