| Titre | Seasonal tropospheric oscillations observed in InSAR time series |
| Télécharger | Téléchargements |
| |
| Licence | Veuillez noter que la Licence du gouvernement
ouvert - Canada remplace toutes les licences antérieures. |
| Auteur | Samsonov, S V ;
Trishchenko, A; Tiampo, K F; González, P J; Fernández, J;
Zhang, Y |
| Source | Géomatique Canada, Présentation scientifique 4, 2015, 1 feuille, https://doi.org/10.4095/296137  Accès ouvert |
| Image |  |
| Année | 2015 |
| Éditeur | Ressources naturelles Canada |
| Document | publication en série |
| Lang. | anglais |
| DOI | https://doi.org/10.4095/296137 |
| Media | en ligne; numérique |
| Formats | pdf |
| Région | Naples Bay; Campi Flegrei; Mount Vesuvius |
| Lat/Long OENS | 14.3333 14.5000 40.8167 40.7333 |
| Sujets | déformation; volcans; télédétection; imagerie radar; méthodes radar; géophysique; géologie structurale |
| Illustrations | cartes de localisation; graphiques; tableaux |
| Programme | Science de la télédétection spatiale |
| Diffusé | 2015 03 31 |
| Résumé | (disponible en anglais seulement)
Applying the Multidimensional Small Baseline Subset Interferometric Synthetic Aperture Radar (MSBAS InSAR) algorithm to 250 ENVISAT and RADARSAT-2 SAR images
spanning 2003-2013 we computed time series of ground deformation over Naples Bay Area in Italy. Two active volcanoes, Vesuvius and Campi Flegrei, are located in this area in close proximity to a densely populated city of Naples. For the first time
with a remarkable clarity in the vertical component of time series we observed elevation dependent seasonal oscillations with an amplitude of up to 1.5 cm, substantially larger than the longterm annual deformation rate. Analysis, utilizing ground
weather station and radiosonde data, linked observed oscillations with seasonal fluctuations of water vapor, air pressure and temperature in a lower troposphere. Atmospherically corrected time series confirmed continuing subsidence at Vesuvius
previously observed by GPS and levelling techniques. Developed methodology demonstrated that for spatially localized studies the Atmospheric Path Delay (APD) can be successfully modeled as an elevation dependent seasonally oscillating
signal. |
| Sommaire | (Résumé en langage clair et simple, non publié)
In this poster we present a new methodology that improves the precision of the ground deformation measurements calculated from radar imagery by
about a factor of two. We used historic radar data acquired since 2003 over a region in Italy that is suitable for such studies. Analyses, utilizing surface weather and radiosonde data, linked the observed signal with seasonal fluctuations of water
vapour, air pressure and temperature in a lower troposphere. The proposed correction is in a good agreement with observed results. |
| GEOSCAN ID | 296137 |
|
|