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TitleLand subsidence, ground fissures and buried faults: InSAR monitoring of Ciudad Guzmán (Jalisco, Mexico)
AuthorBrunori, C A; Bignami, C; Albano, M; Zucca, F; Samsonov, SORCID logo; Groppelli, G; Norini, G; Saroli, M; Stramondo, S
SourceRemote Sensing and Digital Image Processing vol. 7, 7, 2015 p. 8610-8630, Open Access logo Open Access
Alt SeriesEarth Sciences Sector, Contribution Series 20150197
PublisherMDPI AG
Mediapaper; on-line; digital
File formatpdf; html; xml
AreaCiudad Guzmán; Jalisco; Mexico
Lat/Long WENS-103.4667 -103.4417 19.7083 19.6833
Subjectsgeophysics; tectonics; subsidence; remote sensing; structural features; structural analyses; faults; fissures; grabens; InSAR
Illustrationslocation maps; photographs; tables; cross-sections; plots
Released2015 07 07
AbstractWe study land subsidence processes and the associated ground fissuring, affecting an active graben filled by thick unconsolidated deposits by means of InSAR techniques and fieldwork. On 21 September 2012, Ciudad Guzmán (Jalisco, Mexico) was struck by ground fissures of about 1.5 km of length, causing the deformation of the roads and the propagation of fissures in adjacent buildings. The field survey showed that fissures alignment is coincident with the escarpments produced on 19 September 1985, when a strong earthquake with magnitude 8.1 struck central Mexico. In order to detect and map the spatio-temporal features of the processes that led to the 2012 ground fissures, we applied InSAR multitemporal techniques to process ENVISAT-ASAR and RADARSAT-2 satellite SAR images acquired between 2003 and 2012. We detect up to 20 mm/year of subsidence of the northwestern part of Ciudad Guzmán. These incremental movements are consistent with the ground fissures observed in 2012. Based on interferometric results, field data and 2D numerical model, we suggest that ground deformations and fissuring are due to the presence of areal subsidence correlated with variable sediment thickness and differential compaction, partly driven by the exploitation of the aquifers and controlled by the distribution and position of buried faults.

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