Fig. 1 presents fragments of records obtained from digital stations Petropavlovsk (∆ 2.8º), Severo-Kurilsk (∆ 5.4º), Magadan (∆ 5.6º), Bilibino (∆ 12.8º), Yuzhno-Sakhalinsk (∆ 13.3º). Fig. 2 presents fragments of records obtained from digital stations Yakutsk (∆ 16º), Tiksi (∆ 20.2º), Ussuriysk (∆ 20.5º), Vladivostok (∆ 21.3º), Taejon (∆ 28.7º).

Image 1

Image 2

According to GS RAS the earthquake was felt in Petropavlovsk-Kamchatsky and Yuzhno-Kurilsk with a magnitude of 2.

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The focal mechanism solution of the origin of the earthquake was obtained by GS RAS with signs of initial arrivals of P waves at 86 stations, 42 stations registered compression waves (plus signs), 44 stations registered tensile waves (minus signs). These stations are located in the epicentral distances of 2.9-97º and in azymuth sector Az=7-349º. The focal mechanism solution in stereographic projection on the lower hemisphere and the elements of the mechanism are presented in the table. The table also contains focal mechanism solutions obtained at the USGS NEIC with WW-phase Moment Tensor (Mww) technique and in Lamont-Dohert Earth Observatory of Columbia University, USA (LDEO GCMT) with СМТ (Centroid moment tensor) technique. Solutions from different centers are close. The earthquake occurred under the action of a slight prevalence of compressive stresses oriented N-NE (AZ=11-24º). One nodal plane NP1 strikes W-NW (STK=298-302º), another plane NP2 strikes NE (STK=45-62º). NP1 plane lies flatter (DP=10-30º) if compared with NP2 (DP=72-87º). The type of motion along NP1 – reverse fault, along NP2 – left latteral slip with reverse fault component according to GS RAS and left latteral slip according to USGS NEIC and LDEO GCMT. According to USGS NEIC – Mo=5.407*10**18 N*m, Mw=6.4, according to LDEO GCMT – Mo=6.3*10**18 N*m, Mw=6.5.