Çal Çağatay

Abstract

The antique city of Sparti (Greece) was ruined by a magnitude ~7.2 earthquake in 464 B.C. that occurred along the adjacent Sparta fault, and which caused ~ 20,000 deaths. The aim of this master’s research project is to extend the existing knowledge on the Sparta fault by using a combination tectonic and fluvial geomorphology in order to reveal fault effects on the river channels and the distribution of the post-glacial surfaces. Firstly, the morphology and steepness indices of rivers flowing across are evaluated in terms of the longer-term fault activity. Secondly, in the field dip, dip direction, slip vectors and topographic profiles were measured in order to constrain the morphology of the fault and identify new data on the post-glacial slip-rate. Thirdly, extracted post-glacial topographic profiles from DEM were also evaluated with, and compared to fieldwork and published sets in terms of compatibility of obtaining throw heights. Finally, the aforementioned data were correlated in terms of earthquake hazard and risk assessment. The longitudinal profiles of rivers allowed the recognition of slope-break knickpoints and the determination of the steepness index of rivers recording changing in boundary conditions and an inferred the slip-rate increase along the Sparta fault from south to centre. Throw heights correlated with published data and slip-rate of Anogia is 0.28 + 0.28 / -0.06 mm/yr (3.6 +3.6 / -0.8 m / 12.9 ka), Parori is 0.74 ± 0.15 mm/yr (9.6 ± 1.92 m / 12.9 ka and Petrina is 0.65 ± 0.13 mm/yr (8.45 ± 1.69 m /12.9 ka) from south to north. The northern segment which was known as inactive is herein described as active. Although having some restrictions, TanDEM-X DEM can be correlated with to the field data to determine the ‘real’ heights.

Keywords

Fluvial geomorphology, Sparta Fault, The, Knickpoints, TanDEM-X DEM, Active tectonics

Document Type

Thesis

Publication Date

2023

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