Akademik Veri Yönetim Sistemi
Uluslararası Katılımlı 74. Jeoloji Kurultayı, Ankara, Türkiye, 11 - 15 Nisan 2022, ss.22
Since Turkey is located in one of the most active earthquake zones in
the world, there is an earthquake risk in almost the whole country.
Considering the studies carried out by many researchers, the historical
earthquakes in the region and especially the 17 August 1999
earthquake that caused great destruction, it is understood that the
earthquake potential of the Marmara Region is quite high. It is known
that the North Anatolian Fault (NAF), which continues along the
northern line of Anatolia, is one of the most seismically active faults
in the world, and this fault is divided into many small fault branches
with three main branches in the Sea of Marmara. These main branches
are named as the Northern Branch, the Central Branch and the
Southern Branch. Therefore, in the Sea of Marmara, many different
fault types are seen together with the effect of different branches as
well as lateral faults. Previous studies have revealed that many
earthquakes have occurred in the Sea of Marmara are concentrated on
the northern branch of the NAF, and also showed that the earthquakes
occurring on this branch are more than the other branches. However,
as the studies on the central branch on the Southern Marmara shelf are
limited, there is no detailed information in the literature about the
region. Since this fault system, which has a very complex structure in
the Marmara Sea, has many effects in the south, it is necessary to
evaluate possible large-scale earthquakes that could be caused by
many faults belonging to the NAF.
Within the scope of the study, the region between the Kapıdağ
Peninsula and the İmralı Island located on the southern shelf of the
Marmara Sea, is being studied tectonically. Throughout the study,
multi-channel seismic reflection and sparker seismic reflection
datasets collected within the scope of the TUBİTAK 112Y026 project
named as SOMAR, carried out in 2013 and 2014 to examine the
southern shelf of the Marmara Sea. In total, approximately 750 km of
multi-channel seismic reflection, 420 km of sparker seismic reflection
and 450 km of engineering seismic (chirp) datasets were processed and
their initial interpretations were done.
Acoustic data collected within the scope of the study has a penetration
that we call the middle range, so the faults seen up to this depth are
mapped as active and inactive faults. In addition, since the acoustic
basement is at a depth that the data can penetrate in the southern part
of the study area, the basement in this region has been interpreted in
detail and the faults traced to the basement have been revealed. The
levels above the acoustic basement will be interpreted stratigraphically
during the study and horizon maps will be created.