The red marker on the map is the epicenter of the earthquake, the origin was in the Pacific Ocean on the east coast of Kamchatka, at a depth of 20 km, 96 km E of Petropavlovsk-Kamchatsky, 113 km E-NE of Vilyuchinsk and 394 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
|
02:37:56.0
|
53.26 |
160.03 |
50.0 |
79
|
7.4/55 |
6.7/48 |
8-8.5 |
|
GS RAS(Verified) Federal research center, Geophysical survey of Russian Academy of Sciences
|
|
2
|
02:37:49.9
|
52.88 |
160.7 |
10.0 |
10
|
|
6.7/7 |
9.5-10 |
|
GS RAS(Preliminary) Federal research center, Geophysical survey of Russian Academy of Sciences
|
|
3
|
02:37:53.1
|
53.03 |
160.48 |
45.9 |
63
|
К 15.3/29 |
|
|
|
KAGSR Kamchatka Regional Seismological Centre, Petropavlovsk-Kamchatskiy, Geophysical Survey, Russian Academy of Sciences
|
|
4
|
02:37:55.5
|
53.15 |
160.17 |
43.9 |
1191
|
Mw 7.4 |
6.6/465 |
|
10
|
CSEM European - Mediterranean seismological center
|
|
5
|
02:37:54.8
|
53.1 |
160.29 |
39.5 |
104
|
Mw 7.4 |
6.6/1069 |
|
43
|
NEIC National Earthquakes Information Center of US Geological Service
|
Fig. 1 presents fragments of records obtained from digital stations Petropavlovsk (∆ 0.9º), Magadan (∆ 8.1º), Yuzhno-Sakhalinsk (∆ 12.7º), Bilibino (∆ 15.2º), Kuldur (∆ 18.1º). Fig. 2 presents fragments of records obtained from digital stations Tiksi (∆ 22.9º), Talaya (∆ 33.6º), Norilsk (∆ 35.8º), Arti (∆ 53.4º), Obninsk (∆ 62.4º).
Image 1
Image 2
The aftershock process of the Kamchatka mega-earthquake of July 29 with M=8.2 continues.
A strong aftershock occurred on September 13 on the northern flank of the focal zone.
In total, during August 13-14, the GS RAS registered another 14 earthquakes with a magnitude of M>=4.4 in this area.The following earthquakes were felt on September 13 at 00:30 in Petropavlovsk-Kamchatsky with a magnitude of 2 points, at 01:30 in Petropavlovsk-Kamchatsky with a magnitude of 2 points, at 01:31 in Petropavlovsk-Kamchatsky with a magnitude of 2 points, at 06:22 in Vilyuchinsk with a magnitude of 3 points, in Petropavlovsk-Kamchatsky with a magnitude of 2-3 points, at 07:03 in Petropavlovsk-Kamchatsky with a magnitude of 2-3 points, at 14:41 in Petropavlovsk-Kamchatsky with a magnitude of 2 points; on September 14 at 15:10 in Petropavlovsk-Kamchatsky with a magnitude of 3-4 points; September 14: at 15:10 in Zavoiko, Petropavlovsk-Kamchatsky, strength 3-4 points.
| N |
Time in origin (GMT) |
Latitude, degree |
Longitude, degree |
Depth, km |
Stations number |
Ms/N |
mb/N |
I0 (calculated) |
Region |
| 20255213
|
13/09/2025 00:30:44.0.0 |
51.62 |
158.69 |
50.0 |
29 |
|
4.6/9 |
2 |
Near east coast of Kamchatka
|
| 20255208
|
13/09/2025 01:30:49.0.0 |
52.14 |
159.9 |
33.0 |
31 |
|
4.8/20 |
3-3.5 |
Off east coast of Kamchatka
|
| 20255209
|
13/09/2025 01:31:29.0.0 |
52.13 |
159.63 |
40.0 |
35 |
|
5.0/24 |
3-3.5 |
Off east coast of Kamchatka
|
| 20255216
|
13/09/2025 06:22:26.0.0 |
53.29 |
160.32 |
40.0 |
69 |
|
5.3/52 |
4 |
Near east coast of Kamchatka
|
| 20255218
|
13/09/2025 07:03:49.0.0 |
51.27 |
158.4 |
40.0 |
59 |
|
5.3/29 |
4 |
Near east coast of Kamchatka
|
| 20255224
|
13/09/2025 14:41:56.0.0 |
53.39 |
160.56 |
40.0 |
21 |
|
4.6/8 |
2-2.5 |
Near east coast of Kamchatka
|
| 20255228
|
13/09/2025 17:17:13.0.0 |
53.61 |
160.31 |
40.0 |
24 |
|
4.6/13 |
2-2.5 |
Near east coast of Kamchatka
|
| 20255231
|
13/09/2025 19:47:18.0.0 |
53.55 |
160.45 |
40.0 |
24 |
|
4.5/13 |
2-2.5 |
Near east coast of Kamchatka
|
| 20255237
|
14/09/2025 05:01:24.0.0 |
51.41 |
159.53 |
33.0 |
34 |
|
4.9/25 |
3-3.5 |
Off east coast of Kamchatka
|
| 20255239
|
14/09/2025 06:01:43.0.0 |
51.52 |
160.01 |
50.0 |
20 |
|
4.6/14 |
2 |
Off east coast of Kamchatka
|
| 20255243
|
14/09/2025 11:42:10.0.0 |
51.7 |
159.16 |
60.0 |
46 |
|
5.1/27 |
2.5-3 |
Off east coast of Kamchatka
|
| 20255246
|
14/09/2025 15:10:07.0.0 |
53.14 |
159.88 |
60.0 |
19 |
|
4.6/9 |
3 |
Near east coast of Kamchatka
|
| 20255248
|
14/09/2025 17:12:08.0.0 |
52.24 |
160.95 |
20.0 |
18 |
|
4.3/10 |
2.5-3 |
Off east coast of Kamchatka
|
| 20255249
|
14/09/2025 17:28:26.0.0 |
53.53 |
160.56 |
50.0 |
28 |
|
4.4/16 |
|
Near east coast of Kamchatka
|
According to Kamchatka Branch of GS RAS the earthquake was felt at Cape Shipunsky and the hydrometeorological station Semyachik with a magnitude of 5-6 points, in the following populated areas: Vilyuchinsk, Petropavlovsk-Kamchatsky, Radygina, Elizovo with a magnitude of 5 points, Pionersky, Nikolaevka, Koryaki, Paratunka, Zeleny, Vulkanny, Termalny with a magnitude of 4-5 points, Kozyrevsk, Milkovo, Ust-Kamchatsk with a magnitude of 4 points, Pauzhetka, Pushchino with a magnitude of 3-4 points, Severo-Kurilsk, Nikolskoye, Ozernovsky with a magnitude of 3 points.
Focal mechanism solution of the origin was calculated by GS RAS with signs of initial arrivals of P waves at 100 stations, including 83 stations which registered compression waves (plus signs), and 17 stations which registered tensile waves (minus signs). The stations are located in the interval of epicentral distances 0.9-86.6º and in azimuth sectorAz=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 was caused by predominantly south-east oriented compression stresses (AZ=125-137º). One nodal plane NP1 strikes SW (STK=215-231º) according to GS RAS and USGS NEIC and S-SW (STK=211º) according to LDEO GCMT, another plane NP2 strikes NE (STK=36-45º). Nodal plane NP1 is dipping more horizontally (DP=19-24º) if compared with NP2 (DP=66-71º). The type of motion along NP1 – thrust, along NP2 – reverse fault.
Seismic moment according to USGS NEIC makes Mo=1.432*10**20 N*m, Mww=7.37. According to LDEO GCMT it makes Mo=1.34*10**20 N*m, Mw=7.4.
| Axes of main strengths |
Nodal planes |
Center |
|
| T |
P |
N |
NP1 |
NP2 |
PI: 64
Azm: 311
|
PI: 26
Azm: 137
|
PI: 2
Azm: 45
|
Stk: 231
Dp: 19
Slip: 96
|
Stk: 45
Dp: 71
Slip: 88
|
GS RAS Federal research center, Geophysical survey of Russian Academy of Sciences
|
|
PI: 68
Azm: 306
|
PI: 22
Azm: 125
|
PI: 0
Azm: 216
|
Stk: 215
Dp: 23
Slip: 89
|
Stk: 36
Dp: 67
Slip: 90
|
NEIC National Earthquakes Information Center of US Geological Service
|
|
PI: 69
Azm: 309
|
PI: 21
Azm: 124
|
PI: 2
Azm: 215
|
Stk: 211
Dp: 24
Slip: 86
|
Stk: 36
Dp: 66
Slip: 92
|
GCMT Lamont-Doherty Earth Observatory Global CMT Columbia University, USA
|
|