Empirik koda normalizasyonu ve ınsar yöntemlerini kullanarak kaf'taki depremler için büyüklük tahminleri

This thesis presents an integrated seismological and geodetic study to improve earthquake source characterization along the North Anatolian Fault Zone (NAFZ), a region of high seismic risk and significant tectonic complexity. The primary objective is to resolve inconsistencies in regional earthquake catalogs by developing a homogeneous moment magnitude (Mw) catalog for events with magnitudes ranging from 3.5 to 6.0. To achieve this,the Coda Calibration Technique (CCT) that utilizes the stable, scattered energy of coda waves to derive robust source spectra, mitigating path and site effects common in tectonically complex areas, is applied. The calibration is fixed using independently derived Mw from moment tensor inversion for low frequencies and apparent stress (σA) from coda spectral ratios for high frequencies, resulting in a reliable, homogeneous Mw catalog. Second, for two specific events, the 23 November 2022 M w 6.0 Düzce and the 18 April 2024 Mw 5.6 Tokat earthquakes, we conduct Interferometric Synthetic Aperture Radar analysis using Sentinel-1 data. The resulting coseismic deformation fields are modeled using an elastic dislocation formulation to invert for fault slip distribution, providing independent, geodetically-derived Mw estimates that validate the seismological results. A key finding of this study is the evidence for non-self-similar source scaling in the NAFZ; apparent stress is observed to increase with seismic moment, suggesting that larger earthquakes radiate energy more efficiently than smaller ones. Furthermore, the derived apparent stress values are systematically lower than in other active tectonic regions, indicating a potentially low-stress, low-seismic-efficiency environment for the fault zone. This integrated, multi-physics framework not only produces a critical, homogeneous Mw catalog for improved seismic hazard assessment but also provides fundamental new insights into the earthquake rupture physics of the NAFZ.