Publication Date:
2017-04-04
Description:
We 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.
Description:
Published
Description:
8610-8630
Description:
6A. Monitoraggio ambientale, sicurezza e territorio
Description:
JCR Journal
Description:
open
Keywords:
InSAR
;
ground subsidence
;
buried faults
;
ground fissuring
;
04. Solid Earth::04.01. Earth Interior::04.01.02. Geological and geophysical evidences of deep processes
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
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