Study area, the Yeniç / aga Basin, is located in the western part of the
North Anatolian Fault System. It is a 1-5-km-wide and 14-km-long WSWENE-
trending depression bounded by a complex array of strike-slip faults.
The Yeniç / aga Basin is interpreted to be a fault &ndash / wedge basin with the
North Anatolian Fault&rsquo / s System Master Strand, namely the Gerede Fault,
cutting across the basin itself. The basin and its surroundings contain mainly
two groups of rock units namely the paleotectonic units and the neotectonic
units. Paleotectonic units, which are deposited or formed during different
phase(s) of tectonic regimes, comprise several formations. The most
important one of these formations is the Upper Miocene &ndash / Lower Pliocene
Eskipazar formation which plays an important role in understanding the
evolutionary history of the basin. Neotectonic unit deposited under the control
of today&rsquo / s tectonic regime is the Plio-Quaternary Betemü / rlü / formation.v
Betemü / rlü / formation unconformably overlies the paleotectonic Eskipazar
formation throughout the study area and the unconformity separating these
two units corresponds to the time interval during which the paleotectonic
stress regime changed into the neotectonic stress regime. Thus, onset age of
the strike-slip neotectonic regime in the study area is Late Pliocene (~ 2,6
My).
Common basin margin-bounding faults of the Yeniç / aga Basin are, the
ASagi Kuldan fault, the Aksu fault, the izmirli fault set, the Sarayç / ali fault, the
Degirmen fault set and the Hamzabey fault set. They display well-preserved
fault scarps in places. Morphological expressions of these faults and their
geometrical relationships with the local stress regime indicate that these faults
are mainly strike-slip and oblique-slip faults.
Morphotectonic expressions of the faults exposing within the study
area indicate that these faults are active. Most of the settlements within the
study area are located on water-saturated loose basin fill nearby the active
faults. Hence, these are open to future earthquake hazards. Therefore,
structures and settlements have to be constructed on strong grounds away
from the active faults.
| Identifer | oai:union.ndltd.org:METU/oai:etd.lib.metu.edu.tr:http://etd.lib.metu.edu.tr/upload/12605212/index.pdf |
| Date | 01 July 2004 |
| Creators | Arca, Serkan Mehmet |
| Contributors | Kocyigit, Ali |
| Publisher | METU |
| Source Sets | Middle East Technical Univ. |
| Language | English |
| Detected Language | English |
| Type | M.S. Thesis |
| Format | text/pdf |
| Rights | To liberate the content for public access |
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