Abstract
Monitoring of active faults in urban areas is of great importance, providing useful information to assess seismic hazards and risks. The present study concerns the monitoring of the potential ground deformation caused by the active tectonism in the cities of Patras and Pyrgos in Western Greece. A PS interferometric analysis technique was applied using a rich data–set of ERS–1 & 2 SLC images. The results of the interferometric analysis were compared with the tectonic maps of the two cities. Patras show clearer uplift–subsidence results due to the more distinct fault pattern and intense deformation compared to the Pyrgos area, where more diffused deformation is observed, with no significant displacements on the surface.
Highlights
The earthquake cycle of an active fault may include coseismic rupture and interseismic deformation
After transformation of the interferometric results from range–Doppler coordinates into map geometry, point targets were imported in a GIS environment and plotted on a panchromatic Landsat–7 ETM+ image and in the Google Earth environment for point target identification (Figures 4 and 5)
The star on the image refers to the location of the reference point
Summary
The earthquake cycle of an active fault may include coseismic rupture and interseismic deformation. Permanent or Persistent Scatterers Interferometry (PSI) is a technique used to calculate fine motions of individual ground and structure points over wide areas. These reflectors should remain stable (interferometric phase stability over time). During 1993 catastrophic earthquakes affected northwestern Peloponnese in the southern part of Greece They caused serious damages to the greater area of two densely populated cities, Patras and Pyrgos. This study concerns the use of the PS interferometric analysis of ERS–1 and 2 satellite data, over the cities of Pyrgos and Patras in order to monitor and reveal the spatial distribution of creep along active faults
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