Abstract
A dataset obtained from six broadband stations of 111 small- to moderate-sized local events that occurred between 2010 and 2018 was analyzed to reveal the frequency-dependent seismic body (body-Q) and coda (coda-Q) wave attenuation characteristics of three tectonic branches of the Karlıova Triple Junction: the Varto Fault Zone (VFZ), North Anatolian Fault Zone (NAFZ), and East Anatolian Fault Zone. The magnitude range was between 2.8 and 6.1 with shallow (
Highlights
One of the key considerations in earthquake hazard-based studies of a seismically active region is knowing the correct seismic quality factor which controls the mechanism of attenuation and amplitude decay of the corresponding seismic energy that propagates through the medium with distance
Besides providing crustal information about the corresponding region (Hoshiba, 1993; Bianco et al, 2002), the general use of a quality factor in seismic attenuation satisfies the need for assessing earthquake hazard (Pulli, 1984) and the calculation of local magnitudes, spectral source parameters, and synthetic seismograms (Abercrombie, 1997)
In the present paper, frequency-dependent functions representing attenuation characteristics based on P, S, and coda wave phases for the Karlıova Triple Junction (KTJ) region were obtained based on ground motion data recorded by the regional seismic network
Summary
One of the key considerations in earthquake hazard-based studies of a seismically active region is knowing the correct seismic quality factor which controls the mechanism of attenuation and amplitude decay of the corresponding seismic energy that propagates through the medium with distance. The commonly-used attenuation unit is a dimensionless quality factor (Q), which expresses the decay of wave amplitude during wave propagation in the medium (Knopoff, 1964), explained by the ratio of seismic energy lost (ΔE) to harmonic total energy (E) per cycle of vibration: (Q= –2πE / ΔE). Besides providing crustal information about the corresponding region (Hoshiba, 1993; Bianco et al, 2002), the general use of a quality factor in seismic attenuation satisfies the need for assessing earthquake hazard (Pulli, 1984) and the calculation of local magnitudes, spectral source parameters, and synthetic seismograms (Abercrombie, 1997).
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