The red marker on the map is the epicenter of the earthquake, the origin of which was in the Sea of Okhotsk west of the Kuril Islands, at a depth of 160 km, 346 km NE of Kurilsk, 519 km SW of Severo-Kurilsk and 555 km NE of Yuzhno-Kurilsk.
|
Time in origin (GMT) |
Latitude, degree |
Longitude, degree |
Depth, km |
Stations number |
Ms/N |
mb/N |
I0 (calculated) |
GAP |
Center |
| 1
|
12:47:37.0
|
47.27 |
151.23 |
160.0 |
71
|
6.3/22 |
6.8/49 |
4.5-5 |
121
|
GS RAS(Verified) Federal research center, Geophysical survey of Russian Academy of Sciences
|
|
2
|
12:47:36.7
|
46.98 |
151.52 |
160.0 |
11
|
|
7.1/10 |
|
185
|
GS RAS(Preliminary) Federal research center, Geophysical survey of Russian Academy of Sciences
|
|
3
|
12:47:37.2
|
47.24 |
151.36 |
151.9 |
462
|
Mw 6.7 |
6.5/231 |
|
95
|
CSEM European - Mediterranean seismological center
|
|
4
|
12:47:34.3
|
47.0 |
152.09 |
162.6 |
69
|
Mww 6.7/48 |
6.7/126 |
|
178
|
NEIC National Earthquakes Information Center of US Geological Service
|
Fig. 1 presents fragments of records obtained from digital stations Severo-Kurilsk (∆ 4.7º), Yuzhno-Kurilsk (∆ 5º), Yuzhno-Sakhalinsk (∆ 5.8º), Petropavlovsk (∆ 7.5º), Magadan (∆ 12.3º). Fig. 2 presents fragments of records obtained from digital stations Tiksi (∆ 26.6º), Talaya (∆ 30.8º), Norilsk (∆ 37.7º), Arti (∆ 53.9º), Obninsk (∆ 64.2º).
Image 1
Image 2
According to GS RAS, the earthquake was felt in the following populated sites: Kurilsk, Gornoe, Reidovo, Goryachiye Klyuchi with intensity of 3-4 MSK, Yuzhno-Kurilsk, Golovnino, Mendeleyevo, Lagunnoe, Malokurilskoye with intensity of 2-3 MSK.
Focal mechanism solution of the origin was calculated by GS RAS with signs of initial arrivals of P waves at 129 stations, including 24 stations which registered compression waves (plus signs), and 105 stations which registered tensile waves (minus signs). The stations are located in the interval of epicentral distances 4.7-84.1º and in azimuth sector Az=2-359º. 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 occurred under the action of slightly predominant tensile stresses oriented to the east-northeast (AZ=62-72º). One nodal plane NP1 strikes N-NE (STK=13º) according to GS RAS and N (STK=1-2º) according to USGS NEIC and LDEO GCMT, another plane NP2 strikes E-SE (STK=109-117º). NP2 is more horizontal (DP=43-47º) if compared with NP1 (DP=71-76º). The type of motion along NP1 – normal fault with left lateral slip component, along NP2 – right lateral slip. The seismic moment of the earthquake was obtained at GS RAS from the spectra of P waves registered at the station "Tiksi" (∆=26.6º), it makes Mo=1.71*10**19 N*m, Mw=6.8. The seismic moment according to USGS NEIC makes Mo=1.747*10**19 N*m, Mww=6.8. According to LDEO GCMT it makes Mo=1.89*10**19 N*m, Mw=6.8.
| Axes of main strengths |
Nodal planes |
Center |
|
| T |
P |
N |
NP1 |
NP2 |
PI: 19
Azm: 72
|
PI: 42
Azm: 324
|
PI: 42
Azm: 180
|
Stk: 13
Dp: 76
Slip: -46
|
Stk: 117
Dp: 46
Slip: -160
|
GS RAS Federal research center, Geophysical survey of Russian Academy of Sciences
|
|
PI: 19
Azm: 62
|
PI: 45
Azm: 312
|
PI: 39
Azm: 168
|
Stk: 1
Dp: 74
Slip: -49
|
Stk: 109
Dp: 43
Slip: -156
|
NEIC National Earthquakes Information Center of US Geological Service
|
|
PI: 15
Azm: 62
|
PI: 45
Azm: 316
|
PI: 41
Azm: 165
|
Stk: 2
Dp: 71
Slip: -46
|
Stk: 111
Dp: 47
Slip: -154
|
GCMT Lamont-Doherty Earth Observatory Global CMT Columbia University, USA
|
|