Frequency-content parameters of the ground motions from the 2017 Mw 7.3 Ezgeleh earthquake in Iran

Saman Yaghmaei-Sabegh ()
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Saman Yaghmaei-Sabegh: University of Tabriz

Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, 2020, vol. 101, issue 2, No 3, 349-365

Abstract: Abstract This study aims at providing the spatial contours of frequency-content parameters of ground motion records obtained during the 2017 Mw 7.3 Ezgeleh–Kermanshah earthquake in Iran. For this purpose, three scalar frequency-content parameters named the mean period $$ (T_{\text{m}} ) $$(Tm), the average spectral period $$ (T_{\text{ave}} ) $$(Tave), and the smoothed spectral predominant period $$ (T_{0} ) $$(T0) are calculated. Sixty earthquake records with the closest site-to-source distances in the range of 5–330 km were used to make several high-resolution frequency-content maps for the study area. In addition, a new practical framework is presented to estimate soil condition maps based on a simplified ground motion records analyzing which could be used in rapid loss evaluation after earthquakes. As a new idea, the main features of the horizontal-to-vertical spectral ratio curves including amplification amplitude and peak frequency that can identify resonance effect are automatically considered in the proposed regional soil class map. The consistency between frequency-content maps with the anticipated soil condition map is discussed. Prepared maps showed that very long period range extends in the northwest–southeast direction, far from the epicenter.

Keywords: Frequency-content parameters; Mean period; The average spectral period; The smoothed spectral predominant period; Soil effect; Ezgeleh earthquake; Iran; Iraq (search for similar items in EconPapers)
Date: 2020
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DOI: 10.1007/s11069-020-03876-2

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