Akademik Veri Yönetim Sistemi
International Conference on Mathematics and Computers with Applications, İstanbul, Türkiye, 16 - 18 Temmuz 2025, ss.1-10, (Tam Metin Bildiri)
In this study, we aimed to investigate the crustal
structure and the associated future seismic hazards in the Biga-Peninsula
(North Aegean) using algorithms known as P-eceiver function inversion and the
Gutenberg-Richter power-law relation. Firstly, to calculate the shear wave
velocity models, we selected 11 three-component strong motion seismic stations
operated by the Disaster and Emergency Management Authority with approximately
680 local earthquakes. The local earthquakes of magnitude ≥ 4.0 were at epicentral
distances between 30 and 100 km. Secondly, to estimate the distribution of the
Gutenberg-Richter b-value, we
prepared the earthquake catalog using the compilation from the Boğazici
University Kandilli Observatory and Earthquake Research Institute. This
homogeneous catalog spans ~105.12 years, between 1919 and
2025. The distribution of b-value is
examined in depth intervals of 5 km up to 20 km. Through this process, b-value variations at different depths
are analyzed. These depths include 0-5, 5-10, 10-15, and 15-20 km intervals. To
determine the changes in b-value for
these depth intervals, earthquakes occurring at these depths are utilized. In
order to perform the inversion of receiver functions, we implemented three
critical steps: LQT ray coordinate system rotation, time-domain deconvolution,
and stacking with moveout time corrections. Subsequently, we executed the
iterative inversion algorithm using a method similar to Simulated Annealing.
Stacking the receiver functions inverted for 0 km depth allowed us to create
the velocity-depth models beneath the selected stations. According to the
S-wave velocity models, the Moho discontinuity is calculated to be approximately
32 km deep, the Conrad discontinuity is estimated at around 19 km, and a thick
sedimentary layer is found between 1 and 2 km. The crustal velocities are
determined to be high, and the earthquakes that occurred at crustal depths
align with the shear wave velocity distribution. Additionally, small b-values (<1.0) are observed around
the south and southeast regions at a depth of 15 km, including Edremit Gulf,
Havran-Balya Fault Zone, and Balıkesir Fault. While big b-values (>1.0) are observed around the north and northeast
regions at a depth of 5 km to 10 km, including the Sinekçi Fault, Manyas Fault
Zone, and Gündoğan Fault. Thus, this alignment suggests that seismic activity
for the Biga-Peninsula may continue in the future.