Clarifying baseline seismicity for a geotechnical survey site at Gross mining and processing plant

The Gross mining and processing plant under reconstruction is located in southwestern Yakutia, within a territory classified as earthquake-prone. According to the OSR 2015 map with indices A, B, C, the seismicity of the construction area is 9, 9 and 10 points MSK-64 scale, respectively.

Despite significant research experience in clarifying the general seismic zoning, the issues of interpreting the source materials, as well as the results obtained, may be ambiguous. In confirmation of this, it can be noted that over the past 25 years four generations of general seismic zoning maps (OSR 97, OSR 2012, OSR 2015, OSR 2016) followed one another.

The relevance of research is determined not only by the seismic safety of construction projects, but also by their economic component. Thus, 1-point seismic hazard increase entails 13% to 20% construction cost increase.

The aim of the research is to specify the level of baseline seismicity for survey areas using the methodology of probabilistic seismic hazard analysis with respect to the regional seismotectonic conditions of the Gross mining and processing plant construction area.

As a result of the analysis of materials from geodynamic active neotectonic zones, the presence of active structures capable of generating earthquakes with magnitudes М = 6.5 – 7.0 was established.

A probabilistic assessment of the parameters of seismic impacts was carried out: macroseismic intensity (in MSK-64 points), peak accelerations and response spectra, for the case of earthquakes of the maximum possible magnitude Mmax, at the minimum possible distance R from the study area of ​​the projected construction of objects, was carried out using the EAST-2016 software.

The specified level of seismic hazard for return periods of 500, 1000 and 5000 years are I = 8, I = 8.3 and 9.1 points MSK-64 scale, respectively.

1. SP14.13330.2018*. Stroitel'stvo v sejsmicheskih rajonah. — M.: Standartinform, 2018. — 208 s. – Tekst : neposredstvennyj.

2. Ulomov, V.I. Komplekt kart obshhego sejsmicheskogo rajonirovanija territorii Rossijskoj Federacii − OSR-97. Masshtab 1:8000000. Ob#jasnitel'naja zapiska i spisok gorodov i naselennyh punktov, raspolozhennyh v sejsmoopasnyh rajonah / V.I. Ulomov, L.S. Shumilina : OIFZ, 1999−2000. Karta na 4-h listah (Glavnye redaktory V.N. Strahov i V.I. Ulomov). M.: OIFZ−ROSKARTOGRAFIJa. – 2000. - 57 str. – Tekst : neposredstvennyj.

3. Solov'ev, V.N. Utochnenie fonovoj sejsmichnosti na uchastke izyskanij «Sahalinskaja GRJeS-2» (o. Sahalin) / V.N. Solov'ev, I.N. Tihonov, A.I. Kozhurin. – Tekst : neposredstvennyj // Voprosy inzhenernoj sejsmologii. 2014. T. 41. №2. S. 60 – 76.

4. Kramer, S.L. Geotechnical earthquake engineering / Kramer, S.L. – Prenctice Hall Inc., 1996. – 672 rr. Kramer, S.L. – Text : unmediated.

5. Gupta, I.D. Probabilistic seismic hazard analyses method for mapping of spectral amplitudes and other designspecific quantities to estimate the earthquake effects on manmade structures / I.D. Gupta – Text : unmediated // ISET Journal of Earthquake Technology, Paper No. 480. 2007. V. 44. No. 1, March. p. 127–167.

6. McGuire, R.K. Seismic Hazard and Risk Analysis, Earthquake Engineering Research Institute Monograph MNO-10, 2004, 221 pp. – Text : unmediated

7. Grib, N.N. Utochnenie ishodnoj sejsmichnosti rajona stroitel'stva gorno-obogatitel'nogo kombinata «Tokinskoe» / N.N. Grib, I.I. Kolodeznikov, G.V. Grib // Mezhdunarodnyj nauchno-issledovatel'skij zhurnal. — 2024. — №1 (139). — URL: https://research-journal.org/archive/1-139-2024-january/10.23670/IRJ.2024.139.27 (data obrashhenija: 25.01.2024). — DOI: 10.23670/IRJ.2024.139.27

8. Imaeva, L.P. Jevoljucija sejsmotektonicheskih processov vostochnogo flanga Bajkal'skoj riftovoj zony / L.P. Imaeva, V.I. Mel'nikova, V.S. Imaev [i dr.] — Irkutsk: Institut zemnoj kory SO RAN, 2012. — 202 s.

9. Ulomov, V.I. O programmno-matematicheskom obespechenii postroenija kart verojatnostnogo sejsmicheskogo rajonirovanija po metodologii OSR-97 / V.I. Ulomov. – Tekst: neposredstvennyj // Geofizicheskie issledovanija: sbornik nauchnyh trudov Instituta fiziki Zemli RAN. Vypusk 7. M.: Izd-vo IFZ RAN, 2007. S. 29–52.

10. PMO VOSTOK-2016 (EAST-2016)/ [Jelektronnyj resurs] - URL: https://yadi.sk/d/XeEGf8jY8FswYQ

11. Peretokin, S.A. Ocenka ishodnoj sejsmichnosti v zadachah inzhenerno-sejsmologicheskih issledovanij / S.A. Peretokin. – Tekst : jelektronnyj // Materialy XVII Obshherossijskoj nauchno-prakticheskoj konferencii i vystavki «Perspektivy razvitija inzhenernyh izyskanij v stroitel'stve v Rossijskoj Federacii», g. Moskva, 29 nojabrja ‒ 2 dekabrja 2022 g. M.: OOO «Geomarketing». 2022. ‒ 512 s. https://doi.org/10.25296/978-5-6047951-5-6-2022-12-1-512.

12. Rukovodstva po jadernoj i radiacionnoj bezopasnosti: "Opredelenie ishodnyh sejsmicheskih kolebanij grunta dlja proektnyh osnov". (RB - 006 - 98). Normativnyj dokument. - M.: NTC JaRB 2000, 76s.