Morphotectonic Analysis of the Neotectonic and Active Faults of Beotia (Central Greece), Using G.I.S. Techniques

Sboras, Sotiris; Ganas, Athanassios; Pavlides, Spyros

doi:10.12681/bgsg.11335

Cited by 13 publications

(7 citation statements)

References 35 publications

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“…the south-dipping faults accommodating strain maybe more than one [e.g. Tsodoulos et al 2008, Sboras et al 2010] and with different orientations, so the extension direction across the Asopos rift (further east) is different from that across the Erithres fault (Figure 1). This needs more geological data (fault slip vectors) to establish and more GPS campaigns to establish reliable strain patterns.…”

Section: Discussionmentioning

confidence: 99%

“…Central Greece is one of the most tectonically active and rapidly extending regions on planet Earth. Surface topography and geomorphology are clearly associated with seismic activity along large normal faults [Jackson et al 1982, Roberts and Ganas 2000, Goldsworthy and Jackson 2000, Goldsworthy and Jackson 2001, Ganas et al 2004, Tsodoulos et al 2008, Sboras et al 2010, Walker et al 2010, Tsimi and Ganas 2015, Whittaker and Walker 2015. Extension is mainly directed N-S [Clarke et al 1998, Avallone et al 2004, Floyd et al 2010, Chousianitis et al 2013.…”

Section: Introductionmentioning

confidence: 99%

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Strain patterns along the Kaparelli–Asopos rift (central Greece) from campaign GPS data

Marinou¹,

Ganas

Papazissi³

et al. 2015

Annals of Geophysics

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<p>We present results from four GPS campaigns in the broader Kaparelli–Asopos area in central Greece. This area is undergoing extension as demonstrated by seismological, geodetic and geological data. The east-west striking Kaparelli normal fault ruptured during the March 4, 1981, M = 6.3 earthquake and created km-long surface breaks with the downthrown side to the south. The geodetic results include: determination of station coordinates in the ITRF 2005 frame, computation of station velocities with respect to stable Europe and strain rate tensor estimates. The pattern of velocities along the east-west direction (parallel to the rift axis; 40 km E-W × 12 km N-S) and azimuth of strain axes are compared to geological data and to other GPS results in central Greece. We find that strain in this region consists of an amount of shortening (66 ns/yr) in the direction approximately N 58°E, and about three times more extension (187 ns/yr) at N 32°W. A large change in strain orientation (from NW to NNE) is observed from west to east, along the active faults of Asopos rift in agreement with fault slip data. This change signifies the need for using local GPS networks to map local strain rate patterns in actively extending regions of Greece.</p>

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Strain patterns along the Kaparelli–Asopos rift (central Greece) from campaign GPS data

Marinou¹,

Ganas

Papazissi³

et al. 2015

Annals of Geophysics

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“…Tectonic tilting of the surface can cause a deflection of the stream channel away from the midline of drainage basin toward one of its sides (e.g., Keller and Pinter, 2002;Mathew et al, 2016). The Transverse Topographic Symmetry Index (TTSI) and Asymmetry Factor are commonly used to differentiate between symmetric and asymmetric drainage basins and to identify whether they had experienced by a possible tectonic tilting (Cox, 1994;Cox et al, 2001;Garrote et al, 2006;Keller and Pinter, 2002;Mahmood and Gloaguen, 2011;Sboras et al, 2010;Tsodoulos et al, 2008). The TTSI is described as a ratio (Da/Dd), where Da is the perpendicular distance between the trunk stream to the basin midline, and Dd is the perpendicular distance between the basin midline to the basin margin along the same line.…”

Section: Drainage Catchment Analysismentioning

confidence: 99%

Tectonics controls on fluvial landscapes and drainage development in the westernmost part of Switzerland: Insights from DEM-derived geomorphic indices

Radaideh

Mosar

2019

Tectonophysics

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A B S T R A C TThis work focuses particularly on the geomorphological evidence for the tectonic controls on the development of the present-day fluvial landscapes in the westernmost part of Switzerland. The tectonic deformation was evaluated on the basis of a combined analysis of several classical geomorphic indices (hypsometric curves and integrals, transverse topographic symmetry index, and channel's bottom gradients) through high-precision DEM processing. A new optimization strategy was applied for defining geomorphic anomalies related to tectonic activity along the channels of three rivers, based on a combined investigation of topographic swath, longitudinal profiles, geological and geophysical observations. The results show that the abnormally high values of hypsometric integral are spatially occurred on the hanging walls of thrust faults, while abnormally low ones are spatially observed in the same locations of paleo-ice stream pathways. Observations obtained from transverse topographic symmetry index display asymmetries in the most of the studied drainage basins with a predominant SE direction of lateral migration. This direction is in agreement with the dominant dip-direction of the bedding planes within the study area. Abnormal changes in the channel's bottom gradients, which almost coincide in space with pronounced change in the depth of the subsurface geologic layers and in the geophysical properties, are marked by distinct topographic relief in areas where rivers flow above blind and emergent faults. Our analysis not only confirms that there is a significant tectonic control on the evolution of drainage systems, but also revealed a possible evidence for the reactivation of some inherited faults.

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“…Instead of 1.08 of Smf value in UDSW2 which is very tectonically active and fall in class 1 (El Hamdouni et al, 2008) but UDSW2 has two mountain front and the average value is 1.11 (Table: ) Tectonic tilting with direction of tilting of drainage basin can be evaluated by the analysis of Asymmetry factor at the scale of drainage basin (Sharma, et al, 2013;Siddiqui, 2014;Kale et al, 2014). This method was applied over a large area (Hare and Gardner, 1985;Sboras et al,2010).…”

Section: Hypsometric Curve and Hypsometry Integral (Hi)mentioning

confidence: 99%

Assessment of Relative Active Tectonics in Parts of Aravalli Mountain Range, India: Implication of Geomorphic Indices, Remote Sensing and GIS

Ali

Ikbal

2018

Preprint

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Aravalli Mountain Range is an example of erosional mountains, trending NE-SW, shows numerous faults and lineaments. Udaipur area, situated south-east part of the mountain, is considered as tectonically active. So the main objective is to study relative tectonic activity of the Ahar watershed of Udaipur, Rajasthan, India. To assess relative tectonic activity of the area, geomorphic indices such as stream length gradient index (SL), asymmetry factor (Af), basin shape (Bs), valley floor width to valley height ratio (Vf), mountain front sinuosity (Smf), hypsometic integral (Hi), hypsometric curve and transverse topographic symmetry factor (T) is applied. DEM (SRTM), Google earth image and enhanced image of Landsat TM (2008) is used to extract linear features. Result of these geomorphic indices of each sub-watersheds are used to divide area from low to high relative tectonic activity classes, expressed as relative tectonic active index (Iat) and according to Iat value the sub watershed UDSW2, 3 and 4 is tectonically relatively more active than remaining part of the area. Field validation associated with evidences highlighted by using geomorphic indices as well as stream deflrction and lineament analysis reveals that the Ahar watershed of Aravalli Range, particularly the north-western flank, is most affected by tectonic activity.

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Morphotectonic Analysis of the Neotectonic and Active Faults of Beotia (Central Greece), Using G.I.S. Techniques

Cited by 13 publications

References 35 publications

Strain patterns along the Kaparelli–Asopos rift (central Greece) from campaign GPS data

Strain patterns along the Kaparelli–Asopos rift (central Greece) from campaign GPS data

Tectonics controls on fluvial landscapes and drainage development in the westernmost part of Switzerland: Insights from DEM-derived geomorphic indices

Assessment of Relative Active Tectonics in Parts of Aravalli Mountain Range, India: Implication of Geomorphic Indices, Remote Sensing and GIS

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