Fig. 1 presents fragments of records obtained from digital stations Tennant Creek (∆ 17.9º), Kappang (∆ 23.5º), Stephens Creek (∆ 27.6º), Matsushiro (∆ 40.8º), Taejon (∆ 43º). Fig. 2 presents fragments of records obtained from digital stations Yuzhno-Sakhalinsk (∆ 50.9º), Kuldur (∆ 54.1º), Petropavlovsk (∆ 58.4º), Zeya (∆ 59.2º), Ulaanbaatar (∆ 60.7º).

Image 1

Image 2

GS RAS registered three aftershocks with М>=5.2 within eight hours after the main shock.

Figure 1 was obtained from USGS NEIC, it presents USGS Community Internet Intensity Map made by 26 responses from 11 cities.

Image 1

Click here to view detailed macroseismic data (DyfitWeb service)

Focal mechanism solution of the origin was calculated in GS RAS with signs of initial arrivals of P waves at 76 stations, including 16 stations which registered compression waves (plus signs), and 60 stations which registered tensile waves (minus signs). The stations are located in the epicentral interval of 2.9-99.5º and azimuth sector Az= 2.5-359.9º. Focal mechanism solution in stereographic projection on the lower hemisphere and 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 influence of prevailing tensile stresses oriented W-NW (AZ=282-284º). One nodal plane NP1 strikes S-SE (STK=156-161º), another plane NP2 strikes NE (STK=47-54º). NP1 and NP2 planes are dipping at close angles (DP=58-69º). The type of motion along NP1 – right lateral slip wit normal fault component, along NP2 – left lateral slip with normal fault component. The seismic moment of the earthquake was obtained in GS RAS from the spectra of P waves registered at the station "Talaya" (∆65º), it makes Mo=2.248*10**19 N*m, Mw=6.9. Seismic moment according to USGS NEIC makes Mo=3.102*10**19 N*m, Mww=6.9. According to LDEO GCMT it makes Mo= 2.63*10**19 N*m, Mww=6.9.