scholarly journals Active Tectonics of Gülbahçe Fault Zone (GBFZ) by Using Geomorphic Indices, İzmir Province, Western Anatolia, Turkey

2021 ◽  
Vol 21 (5) ◽  
pp. 1195-1209
Author(s):  
Berna GEÇKİN ◽  
Hasan SÖZBİLİR ◽  
Çağlar ÖZKAYMAK ◽  
Mustafa SOFTA
Keyword(s):  
Fault Zone ◽  
Active Tectonics ◽  
Western Anatolia ◽  
Geomorphic Indices

scholarly journals MORPHOTECTONIC ANALYSIS IN THE ELIKI FAULT ZONE (GULF OF CORINTH, GREECE)

2004 ◽  
Vol 36 (4) ◽  
pp. 1706 ◽  
Author(s):  
S. Verrios ◽  
V. Zygouri ◽  
S. Kokkalas
Keyword(s):  
Fault Zone ◽  
Active Tectonics ◽  
Specific Area ◽  
Aerial Photographs ◽  
Tectonic Activity ◽  
Tectonic Geomorphology ◽  
Tectonic Deformation ◽  
Width Ratio ◽  
Geomorphic Indices ◽  
Gulf Of Corinth

Morphotectonic analysis using geomorphic indices has been developed as a basic reconnaissance tool in order to identify areas experiencing rapid tectonic deformation or estimate relative variations of tectonic activity in a specific area. We applied this analysis in Eliki fault zone, which is located in the western part of the Gulf of Corinth. Eliki fault zone was selected because it displays a spectacular geomorphic expression and hosts historic and recent seismicity. The intensity of active tectonics is interpreted through a detailed geomorphic study of the fault-generated mountain fronts and fluvial systems. Tectonic geomorphology analysis of the Eliki footwall area includes the application of the most commonly used geomorphic indices, such as the mountain front sinuosity index (Smf), the valley floor / width ratio index (Vf), the stream gradient index (SL) and the transverse topographic symmetry factor (T). These indices were estimated on topographic maps and aerial photographs of the study area in order to correlate active tectonics and erosional processes. Our results imply that the Eliki fault zone can be assigned to a tectonic class of the higher tectonic activity. However, spatial variations of tectonic activity along the segmented studied fronts point to a general trend of increasing activity towards the east, which is gradually decreasing towards the west.

scholarly journals Morphotectonic Analysis along the Northern Margin of Samos Island, Related to the Seismic Activity of October 2020, Aegean Sea, Greece

Geosciences ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 102
Author(s):  
Paraskevi Nomikou ◽  
Dimitris Evangelidis ◽  
Dimitrios Papanikolaou ◽  
Danai Lampridou ◽  
Dimitris Litsas ◽  
...  
Keyword(s):  
Fault Zone ◽  
Seismic Activity ◽  
Volcanic Rocks ◽  
Active Tectonics ◽  
Normal Fault ◽  
Aegean Sea ◽  
Northern Margin ◽  
The North ◽  
Eastern Aegean ◽  
Half Graben

On 30 October 2020, a strong earthquake of magnitude 7.0 occurred north of Samos Island at the Eastern Aegean Sea, whose earthquake mechanism corresponds to an E-W normal fault dipping to the north. During the aftershock period in December 2020, a hydrographic survey off the northern coastal margin of Samos Island was conducted onboard R/V NAFTILOS. The result was a detailed bathymetric map with 15 m grid interval and 50 m isobaths and a morphological slope map. The morphotectonic analysis showed the E-W fault zone running along the coastal zone with 30–50° of slope, forming a half-graben structure. Numerous landslides and canyons trending N-S, transversal to the main direction of the Samos coastline, are observed between 600 and 100 m water depth. The ENE-WSW oriented western Samos coastline forms the SE margin of the neighboring deeper Ikaria Basin. A hummocky relief was detected at the eastern margin of Samos Basin probably representing volcanic rocks. The active tectonics characterized by N-S extension is very different from the Neogene tectonics of Samos Island characterized by NE-SW compression. The mainshock and most of the aftershocks of the October 2020 seismic activity occur on the prolongation of the north dipping E-W fault zone at about 12 km depth.

Consideration of geomorphic indices in assessment of relative active tectonics in a part of seismogenic compressional Kashmir Basin

2021 ◽  
Vol 14 (13) ◽  
Author(s):  
Umair Ali ◽  
Syed Ahmad Ali ◽  
Maqbool Yousuf ◽  
Qazi Akhter Rasool ◽  
Mukeem Ahmad ◽  
...  
Keyword(s):  
Active Tectonics ◽  
Geomorphic Indices ◽  
Kashmir Basin

scholarly journals Fractal properties and simulation of micro-seismicity for seismic hazard analysis: a comparison of North Anatolian and San Andreas Fault Zones

2012 ◽  
Vol 2 (1) ◽  
pp. 1 ◽  
Author(s):  
Naside Ozer ◽  
Savas Ceylan
Keyword(s):  
Fractal Dimension ◽  
Seismic Hazard ◽  
Fault Zone ◽  
San Andreas Fault ◽  
Fractal Dimensions ◽  
Fault Zones ◽  
Group Method ◽  
Western Anatolia ◽  
P Value ◽  
San Andreas

We analyzed statistical properties of earthquakes in western Anatolia as well as the North Anatolian Fault Zone (NAFZ) in terms of spatio-temporal variations of fractal dimensions, p- and b-values. During statistically homogeneous periods characterized by closer fractal dimension values, we propose that occurrence of relatively larger shocks (M >= 5.0) is unlikely. Decreases in seismic activity in such intervals result in spatial b-value distributions that are primarily stable. Fractal dimensions decrease with time in proportion to increasing seismicity. Conversely, no spatiotemporal patterns were observed for p-value changes. In order to evaluate failure probabilities and simulate earthquake occurrence in the western NAFZ, we applied a modified version of the renormalization group method. Assuming an increase in small earthquakes is indicative of larger shocks, we apply the mentioned model to micro-seismic (M<= 3.0) activity, and test our results using San Andreas Fault Zone (SAFZ) data. We propose that fractal dimension is a direct indicator of material heterogeneity and strength. Results from a model suggest simulated and observed earthquake occurrences are coherent, and may be used for seismic hazard estimation on creeping strike-slip fault zones.

Active tectonics analysis of the Kalmard fault zone, Central Iran

2018 ◽  
Vol 11 (14) ◽  
Author(s):  
M. Moumeni-Taromsari ◽  
M. Dehbozorgi ◽  
R. Nozaem ◽  
A. Yassaghi
Keyword(s):  
Fault Zone ◽  
Active Tectonics ◽  
Central Iran
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