Neotectonics and seismicity of eastern simav graben, Kütahya – Turkey

Download
index.pdf
2014
Kaplan, Mustafa
Show full item record
82
views
33
downloads
The Simav graben is an about 1-9 km wide, 50 km long and approximately WNW-trending active depression. It is located along the western section of a seismogenic belt with a depth of 10-15 km. It is the 10-30 km wide and approximately 500 km long active fault system, namely the Akşehir-Simav fault system. The Simav graben was developed on the northern Menderes Massif under the control of active faults comprising the Simav section of the Akşehir-Simav fault system. The Simav and Akdere grabens include two different fills separated by an intervening angular unconformity: (a) Early Miocene-Middle Miocene deformed graben fill, and (b) Quaternary modern and undeformed graben fill. Geological structures and stratigraphic relationships reveal that there are four tectonic periods differentiated in the study area: (a) N-S extension along the Simav detachment fault, (b) E-W extension and formation of Demirci, Akdere and Selendi grabens, (c) NW-SE compression period characterized by strike-slip faulting, deformation of older graben fills, separation and displacement of the Akdere and Demirci grabens and “non-deposition” in the region, (d) NNE-SSW extension controlled neotectonic period that is characterized by normal faulting and development of both the modern Simav and Akdere grabens. The Simav County and a number of settlements in the size of town and villages are located on and very close to the graben margin-bounding normal faults. Most of them are active and have a capacity of creating destructive earthquakes. This was proved once more by the occurrence of two recent earthquakes. These are the 17 February 2009 Naşa (Simav) (Mw = 5.3) and the 19 May 2011 Söğüt (Simav) (Mw =5.9) earthquakes. The source of the Söğüt earthquake is the Nadarçamı or Seyirkaya fault comprising the Simav fault zone. These faults are normal faults dipping towards NNE. NNE extension and normal faulting mechanism is consistent with the focal mechanism solutions, epicenter location and focus depth and GPS velocity analysis. Simav and a number of settlements located around the active faults are under the threat of earthquake hazard. For this reason, deterministic seismic hazard maps of the study area were prepared to define the earthquake hazard in the Simav region by using the available geological and seismological data as well as a reasonable attenuation relationship for the region. PGA value for Simav city center soil site condition is 0.398 g.
Neotectonics., Seismology., Earthquake zones., Seismic prospecting., Earthquake hazard analysis.
http://etd.lib.metu.edu.tr/upload/12617966/index.pdf
https://hdl.handle.net/11511/24032
Graduate School of Natural and Applied Sciences, Thesis

Suggestions

Earthquake focal mechanism and stress tensor analysis along the central segment of the North Anatolian fault
Karasözen, Ezgi; Özacar, Atilla Arda; Kaymakcı, Nuretdin; Department of Geological Engineering (2010)
The North Anatolian Fault (NAF) is one of the world’s largest active continental strikeslip faults, and forms the northern margin of the Anatolian plate. Although its geologic and geomorphologic features are well defined, crustal deformation and associated seismicity around central segment of the NAF is relatively less-known. In this study, we analyzed locations and focal mechanisms of 172 events with magnitude ≥ 3, which are recorded by 39 broadband seismic stations deployed by the North Anatolian Passive ...
Seismic Intensity Maps for the Eastern Part of the North Anatolian Fault Zone (Turkey) Based on Recorded and Simulated Ground-Motion Data
Askan, Aysegul; Karim Zadeh Naghshineh, Shaghayegh; Bilal, Mustafa (2017-01-01)
Seismic intensity maps are employed globally in the aftermaths of earthquakes for rapid response purposes. These maps involve correlations between intensity and peak ground-motion values. In this study, we focus on eastern sections of the North Anatolian fault zone (NAFZ). The eastern segments of the NAFZ are less investigated and have sparse seismic networks compared with western ones. In particular, we study Erzincan, which is a small city in eastern Turkey, located in the conjunction of three active faul...
Probabilistic seismic hazard assessment for earthquake induced landslides
Balal, Onur; Gülerce, Zeynep; Department of Civil Engineering (2013)
Earthquake-induced slope instability is one of the major sources of earthquake hazards in near fault regions. Simplified tools, such as Newmark’s Sliding Block (NSB) Analysis are widely used to represent the stability of a slope under earthquake shaking. The outcome of this analogy is the slope displacement where larger displacement values indicate higher seismic slope instability risk. Recent studies in the literature propose empirical models between the slope displacement and single or multiple ground mot...
Reliability of transportation lifeline systems subjected to earthquake loads
Topkara Özcan, Naz; Yücemen, Mehmet Semih; Department of Civil Engineering (2016)
Lifelines, such as highway, gas, water and power distribution systems, are networks which extend spatially over large geographical regions. The assessment of the reliability of a lifeline under seismic loads requires particular attention, since the proper functioning of these systems during or after a destructive earthquake is very important. The main objective of this study is to investigate the system reliability of lifeline networks subjected to earthquake loads by concentrating on highway systems consis...
Geotechnical reconnaissance findings of the October 30 2020, Mw7.0 Samos Island (Aegean Sea) earthquake
Ziotopoulou, Katerina; et. al. (2022-11-01)
On October 30, 2020 14:51 (UTC), a moment magnitude (Mw) of 7.0 (USGS, EMSC) earthquake occurred in the Aegean Sea north of the island of Samos, Greece. Turkish and Hellenic geotechnical reconnaissance teams were deployed immediately after the event and their findings are documented herein. The predominantly observed failure mechanism was that of earthquake-induced liquefaction and its associated impacts. Such failures are presented and discussed together with a preliminary assessment of the performance of ...
Citation Formats
M. Kaplan, “Neotectonics and seismicity of eastern simav graben, Kütahya – Turkey,” M.S. - Master of Science, Middle East Technical University, 2014.
METU IIS - Integrated Information Service open@metu.edu.tr