GEOPHYSICAL RESEARCH, 2019, vol. 20, no. 2, pp. 56-72. https://doi.org/10.21455/gr2019.2-5

UDC 550.341

Abstract  References   Full text (in Russian)

S-WAVES ATTENUATION FIELD IN THE NEAR REGION OF NPP SITES ACCORDING TO SEISMIC MONITORING DATA (ON THE EXAMPLE OF THE AKKUYU NPP, TURKEY)

O.I. Aptikaeva(1), S.F. Aptikaev(2)

(1) Schmidt Institute of Physics of the Earth Russian Academy of Sciences, Moscow, Russia

(2) JSC “Atomstroyexport”, Moscow, Russia

Abstract. The possibility of using seismic monitoring data from the areas near the Akkuyu NPP site (Turkey) for the study of attenuation field of S-waves is considered. The catalogs and waveforms of explosions and local earthquakes with magnitudes ML=0.5–3.0 that occurred in the 50-km zone from the Akkuyu NPP site (Turkey) were analyzed.

The attenuation field of S-waves in the near region of the NPP site was constructed using the coda waves of these events at the frequencies of f=1–10 Hz. The attenuation characteristics of the medium were estimated by the damping rate of oscillations the coda (slope of coda envelopes). The zones of increased or decreased S-wave attenuation in this region are reflected in the characteristics of the coda waves, producing, respectively, a noticeable increase or decrease in the coda decay rate. We attributed all the attenuation characteristics of the coda to the near epicentral areas.

In some cases, weakened zones correspond to faults. In addition, strong attenuation is characteristic of clusters where swarms of microearthquakes periodically appear. The swarms correspond to the moments of the occurrence of Eastern Mediterranean earthquakes with M³5.0 and depth H>35 km.

Keywords: seismic monitoring, clusters of seismic activity, shear wave attenuation.

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