The red marker on the map is the epicenter of the earthquake, the origin of which was in the Pacific Ocean off the eastern coast of Kamchatka, at a depth of 55 km, 118 km S-SE of Vilyuchinsk, 125 km S-SE of Petropavlovsk-Kamchatsky and 256 km NE of Severo-Kurilsk.
|
Time in origin (GMT) |
Latitude, degree |
Longitude, degree |
Depth, km |
Stations number |
Ms/N |
mb/N |
I0 (calculated) |
GAP |
Center |
| 1
|
17:48:05.0
|
51.97 |
159.15 |
55.0 |
50
|
5.6/33 |
6.0/24 |
5-5.5 |
154
|
GS RAS(Verified) Federal research center, Geophysical survey of Russian Academy of Sciences
|
|
2
|
17:48:01.1
|
51.74 |
159.83 |
33.0 |
12
|
|
6.0/9 |
6-6.5 |
|
GS RAS(Preliminary) Federal research center, Geophysical survey of Russian Academy of Sciences
|
|
3
|
17:48:04.9
|
52.04 |
158.99 |
33.0 |
842
|
Mw 5.9 |
6.0/408 |
|
24
|
CSEM European - Mediterranean seismological center
|
|
4
|
17:48:06.8
|
52.05 |
158.97 |
53.0 |
164
|
Mw 5.7/32 |
6.0/901 |
|
45
|
NEIC National Earthquakes Information Center of US Geological Service
|
Fig. 1 presents fragments of records obtained from digital stations Petropavlovsk (∆ 1.1º), Severo-Kurilsk (∆ 2.3º), Magadan (∆ 9º), Yuzhno-Sakhalinsk (∆ 11.8º), Anadyr (∆ 15.9º). Fig. 2 presents fragments of records obtained from digital stations Bilibino (∆ 16.5º), Kuldur (∆ 17.8º), Yakutsk (∆ 18.8º), Vladivostok (∆ 20.3º), Tiksi (∆ 23.9º).
Image 1
Image 2
According to GS RAS The earthquake was felt in Petropavlovsk-Kamchatsky with intensity of 4 MSK, in Vilyuchinsk with intensity of 3-4 MSK, in Rybachy, Yelizovo with intensity of 3 MSK, in Severo-Kurilsk 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 97 stations, including 82 stations which registered compression waves (plus signs), and 15 stations which registered tensile waves (minus signs). The stations are located in the interval of epicentral distances 1.1-90.2º and in azimuth sector Az=7-352º. 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 compression stresses oriented SE (AZ=126-130º) according to GS RAS and LDEO GCMT and E-SE (AZ=114º) according to USGS NEIC. One nodal plane NP1 strikes S-SW (STK=196-199º) according to GS RAS and LDEO GCMT, and S (STK=187º) according to USGS NEIC, another plane NP2 strikes NE (STK=39-57º). NP1 plane is dipping at less angle to the horizon (DP=37-41º) if compared with NP2 (DP=53-60º). The type of motion along NP1 is reverse fault with left lateral slip component, along NP2 – reverse fault with right lateral slip component. The seismic moment of the earthquake was obtained by GS RAS from the spectrum of P waves at the "Obninsk" station (∆=33.3º), it makes Mo=5.876*10**17 N*m, Mw=5.8. The seismic moment according to USGS NEIC makes Mo=4.725 *10**17 N*m, Mww=5.7. According to LDEO GCMT it makes Mo=7.54*10**17 N*m, Mw=5.9.
| Axes of main strengths |
Nodal planes |
Center |
|
| T |
P |
N |
NP1 |
NP2 |
PI: 66
Azm: 11
|
PI: 12
Azm: 130
|
PI: 20
Azm: 225
|
Stk: 196
Dp: 37
Slip: 55
|
Stk: 57
Dp: 60
Slip: 114
|
GS RAS Federal research center, Geophysical survey of Russian Academy of Sciences
|
|
PI: 72
Azm: 4
|
PI: 6
Azm: 114
|
PI: 16
Azm: 206
|
Stk: 187
Dp: 41
Slip: 65
|
Stk: 39
Dp: 53
Slip: 111
|
NEIC National Earthquakes Information Center of US Geological Service
|
|
PI: 73
Azm: 8
|
PI: 8
Azm: 126
|
PI: 15
Azm: 218
|
Stk: 199
Dp: 39
Slip: 66
|
Stk: 48
Dp: 55
Slip: 108
|
GCMT Lamont-Doherty Earth Observatory Global CMT Columbia University, USA
|
|