Spatiotemporal analysis and interpretation of 1993–2013 ground deformation at Campi Flegrei, Italy, observed by advanced DInSAR

Abstract

Campi Flegrei is one of the most hazardous volcanic areas in the world because of its close proximity to the city of Naples. Here we apply the multidimensional small baseline subset (MSBAS) differential interferometric synthetic aperture radar (DInSAR) technique to obtain vertical and horizontal components of ground deformation for Campi Flegrei at high spatial and temporal resolutions that span, for the first time, 20 years. The area underwent continuous subsidence from 1993 through 1999. Moderate uplift began in 2010 and substantially increased through 2012, reaching approximately 13 cm by 2013. We model the observed deformation to determine source parameters for subsidence and uplift epochs. Both the inflation and deflation mechanisms involve large, extended sources in a layered hydrothermal system whose location is controlled by the caldera structure and stratigraphy. The temporal resolution of MSBAS approaches that of GPS daily time series, with superior precision and spatial resolution, making it an excellent alternative for volcano monitoring.

Subsidence at Cerro Prieto Geothermal Field and postseismic slip along the Indiviso fault from 2011 to 2016 RADARSAT‐2 DInSAR time series analysis

“…Interferograms were also corrected for long-wavelength ramps (e.g., due to imprecise orbits). The resulting 434 ascending and 344 descending interferograms were resampled to a common spatial grid with 20 m resolution and processed with the advanced Multidimensional Small Baseline Subset (MSBAS) software [Samsonov and d'Oreye, 2012;Samsonov et al, 2014cSamsonov et al, , 2014dSamsonov et al, , 2014bSamsonov et al, , 2016 to generate the times series of vertical and horizontal (east-west) components of surface displacements for each coherent pixel.…”

TWO-DIMENSIONAL LOESS LANDSLIDE DEFORMATION MONITORING WITH MULTIDIMENSIONAL SMALL BASELINE SUBSET (MSBAS) – A CASE STUDY OF XINYUAN No.2 LANDSLIDE, GANSU, CHINA

“…The MSBAS methodology is an extension of the original SBAS method that reconstructs two or three-dimensional deformation rate and time series from ascending and descending InSAR data acquired by different SAR sensors considering various characteristics including wavelength, temporal and spatial resolution, azimuth and incidence angles (Samsonov et al, 2014).The precision of MSBAS-derived results are affected by the quality of interferograms and some processing parameters including phase filtering strength, coherence threshold for unwrapping, location of reference point, techniques for the removal of spatially and temporally correlated atmospheric noise and residual orbital trend.…”

Radar Path Delay Effects in Volcanic Gas Plumes: The Case of Láscar Volcano, Northern Chile

“…The distinction between periods of local volcano deformation and enhanced degassing can be of vital importance both for early warning purposes and for a better understanding of volcano-tectonic processes. Degassing and deforming volcanoes often display a variety of deformation sources, which reflect the complex interplay between (i) magma emplacement/retreat, (ii) accumulation/discharge of volcanic gases and (iii) changes in hydrothermal activity, as e.g., was observed at Campi Flegrei in Italy [68,69], or at Lastarria in Northern Chile [70]. Retention and loss of magmatic and hydrothermal volatiles play a central role in virtually any of the processes that lead to volcano deformation.…”