Fig. 1 presents fragments of records obtained from digital stations Port Moresby (∆ 39.1º), Hobart (∆ 39.3º), Stephens Creek (∆ 41.2º), Tennant Creek (∆ 48.4º), Casey (∆ 65.5º). Fig. 2 presents fragments of records obtained from digital stations Severo-Kurilsk (∆ 75.7º), Petropavlovsk (∆ 77.4º), Yuzhno-Sakhalinsk (∆ 77.7º), Vladivostok (∆ 80.6º), Magadan (∆ 84.9º).

Image 1

Image 2

GS RAS registered six aftershocks with M>=4.9 within 10 hours after the main shock.

According to U.S. Tsunami Warning System a tsunami warning was issued. Maximum tsunami wave with height of 0.01 m was registered in Nuku'alofa, the capital of the Kingdom of Tonga, and 0.05 m in Alofi, Niue Island.
Figure 1 was obtained from USGS NEIC, it presents USGS Community Internet Intensity Map made by 27 responses in 9 cities.

Image 1

Click here to view detailed macroseismic data (DyfitWeb service)

Focal mechanism solution of the origin was calculated by GS RAS with signs of initial arrivals of P waves at 94 stations, including 69 stations which registered compression waves (plus signs), and 25 stations which registered tensile waves (minus signs). The stations are located in the interval of epicentral distances 1.4-99.8º and in azimuth sector Az=0-359º. 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 was caused by predominantly E-NE oriented compression stresses. (AZ=63-69º). One nodal plane NP1 strikes N (STK=350-354º), another NP2 – strikes SE (STK=125º-141º). Nodal plane NP2 is dipping more horizontally (DP=33-39º) if compared with NP1 (DP=56-61º). The type of motion along both planes– reverse fault. The seismic moment of the earthquake was obtained in GS RAS from the spectra of P waves registered at the station "Petropavlovsk" (∆ 77º), it makes Mo=4.19*10**19 N*m, Mw=7.0. The seismic moment according to USGS NEIC makes Mo=4.15*10**19 N*m, Mww=7.0. According to LDEO GCMT it makes Mo=4.15*10**19 N*m, Mw=7.0.