Spectral characteristics of the ground on the seismic stations of Kamchatka

Yu.V. Shevchenko, V.V. Yakovenko 

Kamchatka Branch of the Geophysical Survey of the Russian Academy of Sciences,
Petropavlovsk-Kamchatsky, Russia

Corresponding author: Yu.V. Shevchenko, e-mail: klb@emsd.ru

Abstract. The motion of the Earth's surface during earthquakes largely depends on the properties of the soil near the surface. In this case, the difference in the response of sites on rocky and loose soils can be tenfold, which determines the importance of the specification of ground movement during earthquakes for engineering applications. In this case, there is a large variability in the response of the soil to an earthquake, depending on the position of the site. If a sufficient volume of seismic records has been accumulated at the seismic station, soil motion forecast for the corresponding site can be made with greater confidence. The article describes the methodology and presents the results of calculating soil coefficients at seismic stations in the city of Petropavlovsk-Kamchatsky and neighboring villages relative to the reference station Petropavlovsk. The coefficients were obtained in the range 0.1–10 Hz for 18 frequency bands with a relative width of 0.5. For the central frequencies of the filters, averaged values of the dynamic amplification coefficients of the reaction spectra on station soils were obtained. In the work we used records of 42 regional earthquakes with magnitudes 3.9−8.3.

Keywords: seismic microzoning, spectral soil corrections

About the authors:

SHEVCHENKO Yuri Valentinovich – Head of Metrology Group, Kamchatka Branch of the Geophysical Survey of the Russian Academy of Sciences. Russia, 683006, Petropavlovsk-Kamchatsky, Boulevard Piipa, 9. E-mail: klb@emsd.ru

YAKOVENKO Valentin Valentinovich – Engineer, Kamchatka Branch of the Geophysical Survey of the Russian Academy of Sciences. Russia, 683006, Petropavlovsk-Kamchatsky, Boulevard Piipa, 9. E-mail: valek@emsd.ru

Cite this article as: ShevchenkoYu.V., Yakovenko V.V. Spectral characteristics of the ground on the seismic stations of Kamchatka, Voprosy Inzhenernoi Seismologii (Problems of Engineering Seismology). 2019. V. 46, No. 3. P. 74–94. [in Russian]. https://doi.org/10.21455/VIS2019.3-5

English translation of the article will be published in Seismic Instruments, ISSN: 0747-9239 (Print) 1934-7871 (Online), https://link.springer.com/journal/11990