Abstract
In this study, shallow seismic surveys, including seismic refraction, Multichannel Analysis of Surface Waves (MASW), Refraction Microtremor (ReMi), and Microtremor measurements were conducted to estimate site characterization at 26 strong-motion stations of AFAD (Disaster and Emergency Management Presidency) in the province of Hatay, situated in one of the most seismically active regions in southern Turkey. The Horizontal to vertical spectral ratio (HVSR) technique was applied, using smoothed Fourier spectra derived from a long duration series to determine dominant frequency values at different amplification levels. Shear wave velocity up to 30 m of the ground was detected with MASW analysis. In the ReMi analysis, up to 80 m was reached with a corresponding average of 650 m/s shear wave velocity. The shear wave velocities estimated by the MASW method up to 30 m were compared with those found by the ReMi method, and they were observed to be very compatible. The province of Hatay was classified according to Vs30 based NEHRP Provisions, Eurocode-8, the Turkish Building Earthquake Regulation (TBDY-2018), and Rodriguez-Marek et al. (2001). The shear-wave velocity (Vs30), Horizontal to Vertical ratio’s (H/V) peak amplitude, dominant period, and site class of each site were determined. The H/V peak amplitudes range between 1.9 and 7.6, while the predominant periods vary from 0.23 sec to 2.94sec in the study area. These results are investigated to explain the consistency of site classification schemes.
Highlights
The Hatay area is located in a seismically active region at the western end of the 1000-km long border formed by Arabic and Turkish plates
Over et al (2001) found the average Vs velocities from the REMI studies 413m/s at 0-13m of depth, 420m/s at 13-33m, 560m/s at 33-62m, and 537m/s at about 100 m. These values are very close to the values that we determined by applying the Multichannel Analysis of Surface Waves (MASW) and REMI methods
The subsurface soil condition and experimental site amplification ratios at the strong motion stations of AFAD in the province of Hatay were investigated through geophysical methods including seismic refraction, MASW, REMI, and microtremor surveying
Summary
The Hatay area is located in a seismically active region at the western end of the 1000-km long border formed by Arabic and Turkish plates. Ozmen et al, (2017) conducted a microtremor array exploration of shallow S-wave velocity profiles at 28 sites in the provinces of Hatay and Kahramanmaraş They determined fundamental frequencies from 0.8 to 10 Hz in Hatay and peak amplitude values of more than 5 in Kahramanmaraş. The values from the table 1 are in-situ measurements and results from the field near the stations It can be clearly seen from the figure that the fundamental peak frequency corresponding to the H/V amplitudes are in step with each other which indicate 2.55 and 3.17 Hz respectively which are in the similar site class for predominant based site classifications. The peak amplitudes of the stations (H/V) vary between 1.3-7.6 (Fig. 9a) and their dominant periods range from 0.23 to 3.3 s (Fig.9b)
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