The red marker on the map is the epicenter of the earthquake, the origin was in the Pacific Ocean off the eastern coast of Kamchatka, at a depth of 60 km, 173 km S-SE of Ust-Kamchatsk, 235 km SE of Klyuchi and 359 km NE of Petropavlovsk-Kamchatsky.
|
Time in origin (GMT) |
Latitude, degree |
Longitude, degree |
Depth, km |
Stations number |
Ms/N |
mb/N |
I0 (calculated) |
GAP |
Center |
1
|
18:38:26.0
|
54.73 |
163.3 |
60.0 |
58
|
6.7/21 |
6.6/28 |
6.5-7 |
161
|
GS RAS(Verified) Federal research center, Geophysical survey of Russian Academy of Sciences
|
2
|
18:38:28.3
|
54.68 |
162.66 |
100.0 |
11
|
|
6.4/8 |
5-5.5 |
|
GS RAS(Preliminary) Federal research center, Geophysical survey of Russian Academy of Sciences
|
3
|
18:38:23.0
|
54.81 |
163.14 |
20.0 |
405
|
Mw 6.6 |
|
|
18
|
CSEM European - Mediterranean seismological center
|
4
|
18:38:22.9
|
54.7 |
163.21 |
22.1 |
148
|
Mw 6.6/36 |
6.4/99 |
|
21
|
NEIC National Earthquakes Information Center of US Geological Service
|
5
|
18:38:21.3
|
54.63 |
163.31 |
61.0 |
|
Ml 6.5 |
|
|
|
KAGSR Kamchatka Regional Seismological Centre, Petropavlovsk-Kamchatskiy, Geophysical Survey, Russian Academy of Sciences
|
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.
N |
Time in origin (GMT) |
Latitude, degree |
Longitude, degree |
Depth, km |
Stations number |
Ms/N |
mb/N |
I0 (calculated) |
Region |
20211241
|
16/03/2021 19:22:24.0.0 |
54.7 |
163.3 |
60.0 |
36 |
|
5.3/19 |
3-3.5 |
Off east coast of Kamchatka
|
20211243
|
16/03/2021 19:27:53.0.0 |
54.7 |
163.3 |
60.0 |
30 |
|
4.6/19 |
|
Off east coast of Kamchatka
|
20211242
|
16/03/2021 19:51:32.0.0 |
54.77 |
163.2 |
60.0 |
37 |
|
5.7/23 |
4-4.5 |
Off east coast of Kamchatka
|
20211245
|
16/03/2021 20:40:11.0.0 |
54.71 |
163.35 |
60.0 |
15 |
|
4.5/7 |
|
Off east coast of Kamchatka
|
20211248
|
16/03/2021 22:52:27.0.0 |
54.77 |
163.32 |
60.0 |
12 |
|
4.1/4 |
|
Off east coast of Kamchatka
|
20211250
|
17/03/2021 00:01:34.0.0 |
54.8 |
163.3 |
60.0 |
22 |
|
4.5/8 |
|
Off east coast of Kamchatka
|
20211252
|
17/03/2021 00:14:54.0.0 |
54.75 |
163.2 |
60.0 |
23 |
|
4.6/9 |
|
Off east coast of Kamchatka
|
20211254
|
17/03/2021 00:54:38.0.0 |
54.7 |
163.2 |
60.0 |
16 |
|
4.1/11 |
|
Off east coast of Kamchatka
|
20211256
|
17/03/2021 03:16:39.0.0 |
54.88 |
163.27 |
60.0 |
19 |
|
4.6/13 |
|
Off east coast of Kamchatka
|
20211259
|
17/03/2021 08:17:37.0.0 |
54.95 |
163.25 |
60.0 |
8 |
|
4.4/4 |
|
Off east coast of Kamchatka
|
20211260
|
17/03/2021 09:49:32.0.0 |
54.73 |
163.09 |
60.0 |
32 |
|
4.8/16 |
2-2.5 |
Off east coast of Kamchatka
|
20211261
|
17/03/2021 10:25:04.0.0 |
54.71 |
163.06 |
60.0 |
27 |
|
4.8/16 |
2-2.5 |
Off east coast of Kamchatka
|
20211262
|
17/03/2021 12:32:21.0.0 |
54.68 |
163.21 |
60.0 |
19 |
|
4.8/7 |
2-2.5 |
Off east coast of Kamchatka
|
20211264
|
17/03/2021 12:32:48.0.0 |
54.87 |
163.28 |
60.0 |
22 |
|
4.9/9 |
2-2.5 |
Off east coast of Kamchatka
|
20211263
|
17/03/2021 12:49:57.0.0 |
54.7 |
163.33 |
60.0 |
25 |
|
4.6/16 |
|
Off east coast of Kamchatka
|
20211269
|
17/03/2021 20:06:39.0.0 |
54.82 |
163.36 |
60.0 |
24 |
|
4.3/11 |
|
Off east coast of Kamchatka
|
20211274
|
17/03/2021 23:49:08.0.0 |
54.79 |
163.59 |
60.0 |
14 |
|
4.5/5 |
|
Off east coast of Kamchatka
|
20211278
|
18/03/2021 00:09:40.0.0 |
54.73 |
163.44 |
60.0 |
23 |
|
5.4/12 |
3.5-4 |
Off east coast of Kamchatka
|
20211280
|
18/03/2021 02:22:03.0.0 |
54.75 |
163.44 |
60.0 |
34 |
|
5.0/15 |
2.5-3 |
Off east coast of Kamchatka
|
20211281
|
18/03/2021 02:38:17.0.0 |
54.77 |
163.31 |
60.0 |
37 |
|
4.9/14 |
2-2.5 |
Off east coast of Kamchatka
|
20211282
|
18/03/2021 02:48:35.0.0 |
54.82 |
163.33 |
60.0 |
34 |
|
5.3/16 |
3-3.5 |
Off east coast of Kamchatka
|
20211283
|
18/03/2021 02:59:10.0.0 |
55.1 |
163.06 |
60.0 |
28 |
|
4.8/14 |
2-2.5 |
Off east coast of Kamchatka
|
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.
Axes of main strengths |
Nodal planes |
Center |
|
T |
P |
N |
NP1 |
NP2 |
PI: 16
Azm: 302
|
PI: 4
Azm: 33
|
PI: 74
Azm: 135
|
Stk: 346
Dp: 81
Slip: 166
|
Stk: 78
Dp: 76
Slip: 9
|
GS RAS Federal research center, Geophysical survey of Russian Academy of Sciences
|
|
PI: 17
Azm: 296
|
PI: 5
Azm: 27
|
PI: 73
Azm: 132
|
Stk: 340
Dp: 81
Slip: 165
|
Stk: 72
Dp: 75
Slip: 9
|
NEIC National Earthquakes Information Center of US Geological Service
|
|
PI: 21
Azm: 296
|
PI: 7
Azm: 203
|
PI: 68
Azm: 95
|
Stk: 337
Dp: 70
Slip: 170
|
Stk: 71
Dp: 81
Slip: 20
|
GCMT Lamont-Doherty Earth Observatory Global CMT Columbia University, USA
|
|