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TitlePrincipal component analysis of MSBAS DInSAR time series from Campi Flegrei, Italy
AuthorTiampo, K F; Gonzalez, P J; Samsonov, S V; Fernandez, J; Camacho, A
SourceJournal of Volcanology and Geothermal Research vol. 344, 2017 p. 139-153, (Open Access)
Alt SeriesNatural Resources Canada, Contribution Series 20170211
PublisherElsevier BV
Mediapaper; on-line; digital
File formatpdf
AreaCampi Flegrei; Naples; Italy
Lat/Long WENS 13.3333 14.6667 41.0000 40.6667
Subjectsremote sensing; radar imagery; seismicity; health hazards; volcanoes; subsidence; crustal uplift; magmas; caldera
Illustrationslocation maps; tables; satellite images
Released2017 03 08
AbstractBecause of its proximity to the city of Naples and with a population of nearly 1 million people within its caldera, Campi Flegrei is one of the highest risk volcanic areas in theworld. Since the lastmajor eruption in 1538, the caldera has undergone frequent episodes of ground subsidence and uplift accompanied by seismic activity that has been interpreted as the result of a stationary, deeper source below the caldera that feeds shallower eruptions. However, the location and depth of the deeper source is notwell-characterized and its relationship to current activity is poorly understood. Recently, a significant increase in the uplift rate has occurred, resulting in almost 13 cm of uplift by 2013 (De Martino et al., 2014; Samsonov et al., 2014b; Di Vito et al., 2016). Here we apply a principal component decomposition to high resolution time series from the region produced by the advanced Multidimensional SBAS DInSAR technique in order to better delineate both the deeper source and the recent shallow activity. We analyzed both a period of substantial subsidence (1993 - 1999) and a second of significant uplift (2007 - 2013) and inverted the associated vertical surface displacement for themost likely source models. Results
suggest that the underlying dynamics of the caldera changed in the late 1990s, from one in which the primary signal arises from a shallow deflating source above a deeper, expanding source to one dominated by a shallow inflating source. In general, the shallowsource lies between 2700 and 3400mbelowthe calderawhile the deeper source lies at 7600 m or more in depth. The combination of principal component analysis with high resolution MSBAS time series data allows for these new insights and confirms the applicability of both to areas at risk from dynamic natural hazards.