Fig. 1 presents fragments of records obtained from digital stations Petropavlovsk (∆ 3.2º), Severo-Kurilsk (∆ 6º), Magadan (∆ 8.4º), Seimchan (∆ 10º), Bilibino (∆ 13.5º). Fig. 2 presents fragments of records obtained from digital stations Yuzhno-Sakhalinsk (∆ 15.1º), Yakutsk (∆ 18.9º), Kuldur (∆ 20.1º), Tiksi (∆ 22.5º), Vladivostok (∆ 23.5º).

Image 1

Image 2

GS RAS registered 22 aftershocks with М>=4.1 within 33 hours after the main shock.

According to Kamchatka Branch of GS RAS , the earthquake was felt in Ust-Kamchatsk with intensity of 4-5 MSK, in Nikolskoye, Krutoberegovo with intensity of 4 MSK and in Petropavlovsk-Kamchatsky, Vilyuchinsk, and Klyuchi with intensity of 3 MSK.

Click here to view detailed macroseismic data (DyfitWeb service)

The focal mechanism solution of the origin for the earthquake of March 3 was calculated in GS RAS with signs of initial arrivals of P waves at 94 stations, including 66 stations which registered compression waves (plus signs) and 28 stations which registered tensile waves (minus signs). These stations are located in the interval of epicentral distances of 3.3-95.9º and in azymuth sector Az=Az=5-352º. The focal mechanism solution in stereographic projection on the lower hemisphere and its elements are presented in the table. The table also contains focal mechanism solutions obtained at the USGS NEIC with W-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=27-33º) according to GS RAS and USGS NEIC and S-SW (AZ=203º) according to LDEO GCMT. One nodal plane NP1 strikes N-NW (STK=337-346º), another plane NP2 strikes E-NE (STK=71-78º), both planes are steeply dipping at close angles (DIP=70-81º). The type of motion along NP1 – right latteral slip, along NP2 – left latteral slip. According to USGS NEIC – Mo=9.505*10**18 N*m, Mw=6.6, according to LDEO GCMT – Mo=9.41*10**18 N*m, Mw=6.6.