The red marker on the map is the epicenter of the earthquake, the origin of which was located on the eastern coast of the island of Mindanao, Philippines at a depth of 60 km, 14 km W-SW of Hinatuan, 154 km N-NE of Davao and 898 km S-SE of Manila , capital of the Philippines.
|
Time in origin (GMT) |
Latitude, degree |
Longitude, degree |
Depth, km |
Stations number |
Ms/N |
mb/N |
I0 (calculated) |
GAP |
Center |
| 1
|
14:37:06.0
|
8.34 |
126.19 |
60.0 |
46
|
7.3/24 |
6.9/26 |
7.5-8 |
105
|
GS RAS(Verified) Federal research center, Geophysical survey of Russian Academy of Sciences
|
|
2
|
14:37:03.4
|
8.98 |
126.01 |
10.0 |
13
|
|
6.9/12 |
9.5-10 |
|
GS RAS(Preliminary) Federal research center, Geophysical survey of Russian Academy of Sciences
|
|
3
|
14:37:07.0
|
8.5 |
126.37 |
55.0 |
1094
|
Mw 7.5 |
6.6/458 |
|
9
|
CSEM European - Mediterranean seismological center
|
|
4
|
14:37:03.9
|
8.53 |
126.45 |
32.8 |
79
|
Mw 7.6/86 |
|
|
79
|
NEIC National Earthquakes Information Center of US Geological Service
|
Fig. 1 presents fragments of records obtained from digital stations Vladivostok (∆ 35º), Ussuriysk (∆ 36.1º), Yuzhno-Kurilsk (∆ 39.5º), Yuzhno-Sakhalinsk (∆ 41º), Talaya (∆ 47º). Fig. 2 presents fragments of records obtained from digital stations Severo-Kurilsk (∆ 48.9º), Petropavlovsk (∆ 51.7º), Yakutsk (∆ 53.6º), Tiksi (∆ 63.3º), Bilibino (∆ 65.3º).
Image 1
Image 2
The earthquake was accompanied by numerous aftershocks. GS RAS registered 111 aftershocks with M>4.5 within three days after the main shock. The table shows 20 aftershocks with M>5.5.
| N |
Time in origin (GMT) |
Latitude, degree |
Longitude, degree |
Depth, km |
Stations number |
Ms/N |
mb/N |
I0 (calculated) |
Region |
| 20234793
|
02/12/2023 15:06:48.0.0 |
8.3 |
126.72 |
60.0 |
33 |
|
5.8/25 |
4.5-5 |
Mindanao, Philippines
|
| 20234794
|
02/12/2023 15:22:03.0.0 |
8.05 |
126.7 |
60.0 |
20 |
|
5.6/20 |
4-4.5 |
Mindanao, Philippines
|
| 20234795
|
02/12/2023 15:31:31.0.0 |
8.66 |
126.71 |
60.0 |
32 |
|
5.6/23 |
4-4.5 |
Mindanao, Philippines
|
| 20234799
|
02/12/2023 16:03:44.0.0 |
8.33 |
126.67 |
60.0 |
34 |
|
6.2/28 |
5.5 |
Mindanao, Philippines
|
| 20234801
|
02/12/2023 16:17:03.0.0 |
8.45 |
126.63 |
60.0 |
28 |
|
5.7/19 |
4-4.5 |
Mindanao, Philippines
|
| 20234802
|
02/12/2023 16:19:46.0.0 |
8.32 |
126.71 |
60.0 |
24 |
|
5.9/22 |
4.5-5 |
Mindanao, Philippines
|
| 20234804
|
02/12/2023 16:53:10.0.0 |
8.21 |
126.61 |
60.0 |
34 |
|
5.8/30 |
4.5-5 |
Mindanao, Philippines
|
| 20234806
|
02/12/2023 17:40:17.0.0 |
8.25 |
126.59 |
60.0 |
35 |
|
6.2/31 |
5.5 |
Mindanao, Philippines
|
| 20234807
|
02/12/2023 17:55:26.0.0 |
8.56 |
126.8 |
60.0 |
28 |
|
5.8/22 |
4.5-5 |
Mindanao, Philippines
|
| 20234809
|
02/12/2023 18:09:28.0.0 |
8.49 |
126.84 |
60.0 |
32 |
|
6.0/23 |
5-5.5 |
Mindanao, Philippines
|
| 20234816
|
02/12/2023 20:52:23.0.0 |
8.3 |
126.67 |
60.0 |
46 |
|
6.1/34 |
5-5.5 |
Mindanao, Philippines
|
| 20234820
|
02/12/2023 22:35:46.0.0 |
8.33 |
126.89 |
60.0 |
44 |
|
5.6/35 |
4-4.5 |
Mindanao, Philippines
|
| 20234838
|
03/12/2023 05:43:43.0.0 |
8.59 |
126.73 |
60.0 |
54 |
|
5.7/34 |
4-4.5 |
Mindanao, Philippines
|
| 20234843
|
03/12/2023 10:35:57.0.0 |
8.41 |
126.67 |
60.0 |
45 |
6.4/35 |
6.4/35 |
6-6.5 |
Mindanao, Philippines
|
| 20234859
|
03/12/2023 10:53:07.0.0 |
8.22 |
126.99 |
50.0 |
47 |
|
5.6/33 |
4-4.5 |
Mindanao, Philippines
|
| 20234858
|
03/12/2023 10:54:57.0.0 |
8.43 |
126.77 |
60.0 |
27 |
|
5.6/20 |
4-4.5 |
Mindanao, Philippines
|
| 20234869
|
03/12/2023 14:36:01.0.0 |
8.65 |
126.84 |
45.0 |
36 |
|
5.6/33 |
4.5-5 |
Mindanao, Philippines
|
| 20234867
|
03/12/2023 19:49:39.0.0 |
8.86 |
126.59 |
50.0 |
47 |
6.7/31 |
6.5/33 |
7-7.5 |
Mindanao, Philippines
|
| 20234898
|
04/12/2023 05:08:39.0.0 |
8.84 |
126.5 |
50.0 |
57 |
|
5.6/40 |
4-4.5 |
Mindanao, Philippines
|
| 20234913
|
05/12/2023 00:34:30.0.0 |
8.85 |
126.43 |
45.0 |
59 |
|
5.6/37 |
4.5-5 |
Mindanao, Philippines
|
Focal mechanism solution of the origin was calculated by GS RAS with signs of initial arrivals of P waves at 84 stations, including 68 stations which registered compression waves (plus signs), and 16 stations which registered tensile waves (minus signs). The stations are located in the interval of epicentral distances 1.4-95.7º and in azimuth sector Az=1-359º. 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 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 influence of prevailing compression stresses oriented to the E-SE (AZ=103º) according to GS RAS and E (AZ=94-96º) according to USGS NEIC and LDEO GCMT. One ndal lane NP1 strikes N-NE (STK=11-22º), another plane NP2 strikes S-SE (STK=171º) according to GS RAS and S-SE (STK=166-167º) according to USGS NEIC and LDEO GCMT. NP2 plane is dipping less steeply the horizon (DP=17-22º) if compared with NP1 (DP=71-74º). The type of motion along NP1 is reverse fault, along NP2 - thrust with left lateral slip component. The seismic moment was obtained by GS RAS from the spectrum of P waves registered at the station "Talaya" (∆ 47º), it makes Mo=2.373*10**20 N*m, Mw=7.6. The seismic moment according to USGS NEIC makes Mo=3.120 *10**20 N*m, Mww=7.6. According to LDEO GCMT it makes Mo=3.06*10**20 N*m, Mw=7.6.
| Axes of main strengths |
Nodal planes |
Center |
|
| T |
P |
N |
NP1 |
NP2 |
PI: 62
Azm: 309
|
PI: 25
Azm: 103
|
PI: 10
Azm: 198
|
Stk: 22
Dp: 71
Slip: 101
|
Stk: 171
Dp: 22
Slip: 61
|
GS RAS Federal research center, Geophysical survey of Russian Academy of Sciences
|
|
PI: 60
Azm: 292
|
PI: 29
Azm: 96
|
PI: 7
Azm: 190
|
Stk: 12
Dp: 74
Slip: 97
|
Stk: 167
Dp: 17
Slip: 66
|
NEIC National Earthquakes Information Center of US Geological Service
|
|
PI: 63
Azm: 294
|
PI: 25
Azm: 94
|
PI: 8
Azm: 188
|
Stk: 11
Dp: 71
Slip: 99
|
Stk: 166
Dp: 21
Slip: 67
|
GCMT Lamont-Doherty Earth Observatory Global CMT Columbia University, USA
|
|