A Comparative Analysis of Digital Filtering for Seismic Signals from Adana, Van, and Bingol Earthquakes in Turkey

This paper includes a comparative application of the digital filters on data processing for the strong motion data recorded during earthquakes. Three types of digital, acausal filters (designed by Butterworth, Bessel, and Chebyshev type I) with N=4 were used to remove the unwanted noise. The data has been collected from three different stations located in Turkey (Adana, Van, and Bingol) that are working with a digital type of seismograph (Guralp cmg5td and SigSasmach). Those stations are close to the earthquake events with different moment magnitudes Mw = 4.5, 3.8, and 3.3. The SAC software tool has been used to evaluate digital filter influence on time series (acceleration, velocity, and displacement). This has been done by measuring and comparing some strong motion parameters (peak ground acceleration, peak ground velocity, and peak ground displacement).