Unit:
Κατεύθυνση ΤεκτονικήLibrary of the School of Science
Supervisors info:
Στυλιανός Λόζιος, Αναπληρωτής Καθηγητής (ΕΚΠΑ)
Κωνσταντίνος Σούκης, Ε.ΔΙ.Π. (ΕΚΠΑ)
Ισαάκ Παρχαρίδης, Καθηγητής (ΧΑΡΟΚΟΠΕΙΟ ΠΑΝΕΠΙΣΤΗΜΙΟ ΑΘΗΝΩΝ)
Original Title:
ΠΑΡΑΚΟΛΟΥΘΗΣΗ ΤΗΣ ΠΑΡΑΜΟΡΦΩΣΗΣ ΣΤΗΝ ΕΥΡΥΤΕΡΗ ΠΕΡΙΟΧΗ ΚΑΠΑΡΕΛΛΙΟΥ-ΠΛΑΤΑΙΩΝ ΜΕ ΤΗ ΣΥΜΒΟΛΗ ΤΗΣ ΔΙΑΧΡΟΝΙΚΗΣ ΣΥΜΒΟΛΟΜΕΤΡΙΑΣ ΡΑΝΤΑΡ (ΜΤ ΙnSAR) ΚΑΙ ΔΟΡΥΦΟΡΙΚΩΝ ΕΙΚΟΝΩΝ COPERNICUS (SENTINEL-1)
Translated title:
GROUND DEFORMATION MONITORING OF THE WIDER AREA OF KAPARELLI - PLATAIES BASIN (WEST BEOTIA, GREECE), WITH THE CONTRIBUTION OF MULTITEMPORAL SAR INTERFEROMETRY AND COPERNICUS EARTH OBSERVATION IMAGES
Summary:
Characterizing active faults and quantifying their activity are major concerns. Furthermore, monitoring of active faults in areas of high exposure both building store and population is of great importance and provides useful information to assess seismic hazards and risks. Geodetic measurements including GPS and leveling have provided valuable observations of crustal deformation however they don’t have the high spatial resolution needed to detect surface creep on individual faults in detail. Combining interferometric results and geological field work can lead to a better understanding of fault movement and the ground deformation that it causes and thus contribute to seismic hazard assessment. The main target of this dissertation is to detect potential displacement along the Kaparelli fault and/or subsidiary faults in the area by the synergy of geological field observations and MTInSAR novel technique which is a well-documented technique for the characterization of ground motions over large spatial areas and is capable of detecting movements with metric resolution and millimetric accuracy.
The study area is part of the Corinth rift and more specifically it is located in Kaparelli – Plataies area (west Beotia, Greece). Surface topography and geomorphology of the Corinth rift are clearly associated with seismic activity along large normal faults. The 1981 earthquake sequence was characterized by shallow earthquakes (<10km) and magnitudes greater than 6R. The third shock ruptured the Kaparelli fault which was activated during that period and produced extensive ground deformation. In a larger scale this fault is a segment of a normal fault zone that is situated to the north of Parnitha Mountain, which represents the boundary between fast-slipping normal faults in Corinth-Perachora regions and slow-slipping faults in Beotia, Attica. The Kaparelli fault is an ~E-W, south dipping normal fault with an active fault plane dipping at about 60o. It presents a complex geometry with numerous hard-linked segments, each one having a few hundred meters length. Field observations include a fault scarp height model (based on field data) and a map of the fault trace based on detailed field measurements.
For the MTInSAR technique a rich dataset of 92 ascending and 55 descending SLC Sentinel 1 A & B scenes covering the period October 2014 to November 2018 were processed using the SARPROZ s/w following the Persistent Scatterers Interferometry technique (PSI).
MTInSAR results show that the Kaparelli-Plataies area is more or less stable with detected ground deformation not exceeding 2mm/year. On the other hand, several linear cryptic structures are exposed. These are not related to any known fault and they could represent secondary faults. The identification of the nature of those structures is part of a future work.
Main subject category:
Science
Keywords:
Ground deformation, Kaparelli Fault, Neotectonics, MTInSAR, Corinth rift,