Abstract
An overview of regional seismicity registered by the Arkhangelsk seismic network is presented. In 2013 the Arkhangelsk seismic network included 9 digital seismic stations (ARH, KRR, PRG, TMC, PRO, LASH, SLV, AMD, and ZFI/ZFI2). A large number of technogenic events were recorded by the Arkhangelsk network in the north of the East European Platform (Arkhangelsk Region). Only 2 earthquakes were registered during the entire observation period: on October 22, 2005, at 17h46m with ML=2.9, and on March 28, 2013, at 07h02m with ML=3.4. The parameters of the hypocenter of the March 28, 2013 earthquake were evaluated using all currently available source data and bulletins of Russian and foreign seismic stations. The evaluation was done using the method of Generalized beamforming, in an improved form, implemented in the program NAS (New Association System). This earthquake is reprocessed using the same initial data (26 arrivals of seismic P- and S-phases from 13 seismic stations) by the NAS program. The epicentral distances ranged from 85 to 1800 km. The final parameters of the epicenter are as follows: 28.03.2013, t0=07:02:16.2, φ=63.95°N, λ=41.57°E. The epicenter is located 80 km south of Arkhangelsk in a sparsely populated area slightly west of the Severnaya Dvina River. The probable source depths lie in the interval from 2 to 33 km and the depth with the maximal value of the rating function is 19 km. A map of earthquakes in the Arctic region is provided. Earthquakes were registered by stations of the Arkhangelsk seismic network and processed together with the waveforms from other networks. The distribution of earthquakes correlates with the seismic zones of the Arctic – the Knipovich and Gakkel ridges, Spitsbergen. There are weak earthquakes on the shelf of the Barents Sea near the Frantz Josef land archipelago, as in 2012. They relate to the trench of Franz Victoria, the border of the continental slope, and the island of Bely. The coordinates of the epicenters of 290 earthquakes were determined in 2013. The representative level of the Euro-Arctic region's magnitude for 2013 according to the Arkhangelsk network was 2.9.
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