The red marker on the map is the epicenter of the earthquake, its focus was on Mindanao Island, Philippines at a depth of 10 km, 23 km south of Kidapawan, 63 km W-SW of Davao and 980 km S-SE of Manila, the 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
|
01:04:40.1
|
6.78 |
125.1 |
10.0 |
63
|
6.5/32 |
6.6/35 |
9-9.5 |
93
|
GS RAS(Verified) Federal research center, Geophysical survey of Russian Academy of Sciences
|
|
2
|
01:04:41.3
|
6.59 |
124.88 |
25.0 |
25
|
|
6.4/19 |
8.5-9 |
148
|
GS RAS(Preliminary) Federal research center, Geophysical survey of Russian Academy of Sciences
|
|
3
|
01:04:44.9
|
6.83 |
125.12 |
20.0 |
231
|
Mw 6.6 |
|
|
21
|
CSEM European - Mediterranean seismological center
|
|
4
|
01:04:44.7
|
6.8 |
125.04 |
15.0 |
88
|
Mw 6.6 |
|
|
31
|
NEIC National Earthquakes Information Center of US Geological Service
|
Fig. 1 presents fragments of records obtained from digital stations Port Moresby (∆ 27.2º), Tennant Creek (∆ 28.1º), Taejon (∆ 29.5º), Matsushiro (∆ 32º), Vladivostok (∆ 36.7º). Fig. 2 presents fragments of records obtained from digital stations Stephens Creek (∆ 41.5º), Yuzhno-Sakhalinsk (∆ 42.8º), Ulaanbaatar (∆ 43.7º), Petropavlovsk (∆ 53.3º), Makanchi Arr Point (∆ 54.1º).
Image 1
Image 2
GS RAS registered four aftershocks with М>=5 within 2 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 |
| 20193890
|
29/10/2019 01:28:02.0.0 |
6.78 |
125.12 |
10.0 |
24 |
|
5.2/13 |
5.5-6 |
Mindanao, Philippines
|
| 20193891
|
29/10/2019 02:20:32.0.0 |
6.91 |
125.14 |
10.0 |
26 |
|
5.0/13 |
5-5.5 |
Mindanao, Philippines
|
| 20193892
|
29/10/2019 02:22:33.0.0 |
6.84 |
125.22 |
10.0 |
24 |
|
5.2/16 |
5.5-6 |
Mindanao, Philippines
|
| 20193893
|
29/10/2019 02:42:35.0.0 |
6.85 |
125.08 |
10.0 |
52 |
|
5.9/28 |
7.5-8 |
Mindanao, Philippines
|
The focal mechanism solution of the origin was calculated in GS RAS with signs of initial arrivals of P waves at 63 stations, including 35 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 0.56-88.5º and in azimuth sector Az=1-349º. 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 solution obtained at the USGS NEIC with WW-phase Moment Tensor (Mww) technique. Solutions from different centers are close. The earthquake occurred under the action of close-in value compression stresses oriented to the east (AZ=98-108º) and tensile stresses oriented S-SW (AZ=200º) in GS RAS solution and north (AZ =6º) according to USGS NEIC. NP1 plane strikes SE (STK=143-154º), NP2strikes SW (STK=234-245º), both planes are inclined to the horizon rather steeply at close angles (DIP=75-88º). The type of motion along NP1 – left latteral slip, along NP2 - right latteral slip. According to USGS NEIC Mo=9.23*10**18 N*m, Mww=6.6.
| Axes of main strengths |
Nodal planes |
Center |
|
| T |
P |
N |
NP1 |
NP2 |
PI: 7
Azm: 200
|
PI: 15
Azm: 108
|
PI: 74
Azm: 315
|
Stk: 154
Dp: 85
Slip: -16
|
Stk: 245
Dp: 75
Slip: -174
|
GS RAS Federal research center, Geophysical survey of Russian Academy of Sciences
|
|
PI: 1
Azm: 6
|
PI: 5
Azm: 98
|
PI: 85
Azm: 265
|
Stk: 143
Dp: 86
Slip: -2
|
Stk: 234
Dp: 88
Slip: -176
|
NEIC National Earthquakes Information Center of US Geological Service
|
|