Steady late quaternary slip rate on the Cinarcik section of the North Anatolian fault near Istanbul, Turkey

The distribution of plate motion between multiple fault strands and how this distribution may evolve remain poorly understood, despite the key implications for seismic hazards. The North Anatolian Fault in northwest Turkey is a prime example of a multistranded continental transform. Here we present the first constraints on late Quaternary slip rates on its northern branch across the Cinarcik Basin in the eastern Marmara Sea. We use both deep penetration and high‐resolution multichannel seismic reflection data with a stratigraphic age model to show that a depocenter has persisted near the fault bend responsible for that transform basin. Successively older depocenters have been transported westward by fault motion relative to Eurasia, indicating a uniform right‐lateral slip rate of 18.5 mm/yr over the last 500,000 years, compared to overall GPS rates (23–24 mm/yr). Thus, the northern branch has slipped at a nearly constant rate and has accounted for most of the relative plate motion between Eurasia and Anatolia since ~0.5 Ma

A Comparison of Post-stack Results after Filtering of Harmonic Noise Using Two Filter Methods

Harmonic noise in seismic data is a single frequency noise caused by power line within the data acquisition systems and generally filtered by classical notch filter. However, the notch filter would attenuate all recorded data around notch frequency at especially 50 Hz (or 60 Hz) and so leads to loss available information that explains fine details in the seismic data. On the other hand, iterative trimmed and truncated mean filter method locally applied in spectral domain (LITTM) is a signal protector filter and is very effective to remove the harmonic noise in the signal. In this study we proposed to compare the quality of migrated sections after removing the harmonic noise by using classical notch and LITTM filters. We tested the applicability and reliability of the LITTM filter in removing the single frequency harmonic noise on synthetic data set and then applied it to a marine data from Turkey. When comparing the outputs from classical notch and LITTM filters, we found that the LITTM filter strikes a balance between the removing harmonic noise and protecting available frequencies. Our experiments show that the LITTM filter can effectively be used to eliminate other spike-like noise within the bandwidth of the data