Seismicity and seismic hazard assessment of Magadan Region on a scale close to detailed seismic zoning

A.I. Lutikov1,2, N.V. Andreeva2, I.P. Gabsatarova1, G.Yu. Dontsova1, L.I. Karpenko3

1 Federal Research Center “United Geophysical Service of the Russian Academy of Sciences”, Obninsk, Russia

2 Schmidt Institute of Physics of the Earth, Russian Academy of Sciences, Moscow, Russia

3 Magadan Branch of FRC UGS RAS, Magadan, Russia

Corresponding author: A.I. Lutikov, e-mail: ail@ifz.ru

Abstract. The Magadan region seismic hazard assessment in the coordinates 58.5°–66.0° N, 143.3°–157.7° E is presented in points of the macroseismic scale. The scale of the research corresponds to the regional one (in Russian terminology this corresponds to the scale of the detailed seismic zoning (DSZ). The main parameters of seismicity are estimated as follows: the slope of the recurrence graph, the seismic activity matrix, the average thickness and depth of the seismically active layer (h). On the base of the obtained results, we used the focal depth h = 10 km, when calculating seismic intensity maps. Based on the analysis of a complex of seismological, tectonic and geological data on the territory of the Magadan region, we constructed a seismic source zone model with 13 zones of possible seismic sources (ZPSS) of Mmax = 6.5, 7.0 and 7.5. Outside the identified zones, the background seismicity Mmax = 5.0 was used. The study resulted in probabilistic seismic hazard maps of the Magadan Region in terms of a macroseismic scale (intensity points), calculated for an average recurrence time as 500, 1000 and 5000 years.

Keywords: seismic hazard, macroseismic intensity, recurrence graph, seismic activity, seismic source zones, seismic shakeability

About the authors:

LUTIKOV Alexander Ivanovich – Candidate of Physical and Mathematical Sciences, Leading Researcher, Federal Research Center “United Geophysical Service of the Russian Academy of Sciences”. 249035, Obninsk, prosp. Lenina, 189; Schmidt Institute of Physics of the Earth of the Russian Academy of Sciences. 123242, Moscow, ul. Bolshaya Gruzinskaya, 10, building 1. E-mail: ail@ifz.ru

ANDREEVA Nadezhda Vyacheslavovna – Research Fellow, Schmidt Institute of Physics of the Earth of the Russian Academy of Sciences. 123242, Moscow, ul. Bolshaya Gruzinskaya, 10, building 1. E-mail: znv@ifz.ru

GABSATAROVA Irina Petrovna – Candidate of Physical and Mathematical Sciences, Leading Researcher, Federal Research Center “United Geophysical Service of the Russian Academy of Sciences”. 249035, Obninsk, prosp. Lenina, 189. E-mail: ira@gsras.ru

DONTSOVA Galina Yurievna − Research Fellow, Federal Research Center “United Geophysical Service of the Russian Academy of Sciences”. 249035, Obninsk, prosp. Lenina, 189. E-mail: donzova@ifz.ru

KARPENKO Larisa Ivanovna – Candidate of Geological and Mineralogical Sciences, Scientific Secretary, Magadan Branch of FRC UGS RAS. 685024, Magadan, ul. Skuridina, 6-b. E-mail: Larisa@memsd.ru

Cite this article as: Lutikov A.I., Andreeva N.V., Gabsatarova I.P., Dontsova G.Yu., Karpenko L.I. Seismicity and seismic hazard assessment of Magadan Region on a scale close to detailed seismic zoning, Voprosy Inzhenernoi Seismologii (Problems of Engineering Seismology). 2019. V. 46, No. 3. P. 16–31. [in Russian]. https://doi.org/10.21455/VIS2019.3-2

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