Information message about destructive earthquake in Pakistan on October 28, 2008. |
| The strong earthquake with M=6.5 has happened on October 28, 2008 at 23:09 GMT (October 29, 02:09 Moscow time) in Baluchistan province at the south-west of Pakistan. It caused victims and destructions. |
| Parameters of the earthquake
have been determined in the Alert Service (AS) of Information
Processing Center (IPC) of Geophysical Survey of RAS in Obninsk with station data
obtained from digital and analog seismic stations of Russia, countries of CIS
and from abroad. Alert message on this earthquake has been delivered in 20 min after
registration to the Ministry of Emergency of the Russian Federation (EMERCOM). |
| Preliminary processing has been done with data from 59 stations, accurate processing - with data 71 stations. |
| Fig. 1 presents fragments of records obtained from digital stations Ala Archa (∆ 13.1º), Garni (∆ 20.7º), Kurchatov (∆ 21.6º), Borovoe (∆ 22.4º), Kislovodsk (∆ 23.6º). Fig. 2 presents fragments of records obtained from digital stations Obninsk (∆ 32.8º), Talaya (∆ 33.9º), Yakutsk (∆ 50.4º), Bilibino (∆ 65.1º), Petropavlovsk (∆ 66.2º). |
Figure 1
| 
Figure 2
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|
| IPC GS RAS also has obtained information with parameters of this event from some seismological centers, these data are given in table 1: |
| Table 1 |
| NN |
Time in origin h-min-s (GMT) |
Lat degr. |
Lon degr. |
Depth km |
N s/st |
Ms/ N |
mb/ N |
I0 calc |
GAP |
Center | | 1 |
23-09-56.3 |
30.74 |
67.47 |
15 |
71 |
6.5/25 | 6.2/32 | 8.5-9 | 92 | IPC GS RAS (Accurate) | | 2 |
23-09-56.3 |
30.74 |
67.47 |
15 |
59 |
6.5/24 | 6.2/24 | 8.5-9 | 92 | IPC GS RAS (Preliminary) | | 3 |
23-09-57.4 |
30.7 |
67.36 |
10 |
583 |
6.4 Mw | | | 20 | CSEM | | 4 |
23-09-57.5 |
30.74 |
67.34 |
10 |
60 |
6.2 Mw | 6.5/25 | | | NEIC (Preliminary) | | 5 |
23-09-58.2 |
30.65 |
67.32 |
15 |
130 |
6.4 Mw | 6.2/118 | | 25 | NEIC (Accurate) | |
| IPC GS RAS - Informational Processing Center, Geophysical Survey, Russian Academy of Sciences |
| CSEM - European - Mediterranean seismological center |
| NEIC - National Earthquakes Information Center of US Geological Service |
| Epicenter |
| Epicenter of this earthquake (red star on fig. 3) was located on the territory of south-western Pakistan province Balochistan at the depth 15 km, 70 km NE of Quetta, 192 km SE of Afghan town Kandahar and 630 km SW of Islamabad. |
Figure 3 |
|
| Aftershock |
| In 37 minutes before the main shock Geophysical Survey of RAS registered foreshock with magnitude 5.4.
Within 19 hours after the main shock it was registered 8 aftershocks, including 7 weak with magnitudes from 4.4 to 4.8, and one with magnitude 6.5 equal to the main shock.
|
| N |
Date & Time (GMT)
yy-mm-dd hh:mm:sec |
Lat
degr. |
Lon
degr. |
Depth
km |
N
station |
Ms/ N |
mb/ N |
Io
calc. |
Region |
| 20083502 | 2008-10-28 22:33:11.0 | 30.75 | 67.65 | 33 | 41 | - | 5.4/ 15 | 4.5 | Pakistan | | 20083504 | 2008-10-28 23:54:13.0 | 30.62 | 67.93 | 33 | 15 | - | 4.4/ 9 | 2-2.5 | Pakistan | | 20083505 | 2008-10-29 00:31:58.0 | 30.69 | 67.71 | 15 | 31 | - | 4.8/ 12 | 4-4.5 | Pakistan | | 20083507 | 2008-10-29 02:58:54.0 | 31.03 | 68.14 | 33 | 19 | - | 4.6/ 12 | 2.5-3 | Pakistan | | 20083508 | 2008-10-29 11:32:42.0 | 30.68 | 67.66 | 15 | 53 | 6.5/ 18 | 6.4/ 19 | 8.5-9 | Pakistan | | 20083509 | 2008-10-29 13:38:48.0 | 30.46 | 67.52 | 33 | 17 | - | 4.3/ 7 | - | Pakistan | | 20083510 | 2008-10-29 15:32:46.0 | 30.51 | 67.32 | 15 | 7 | - | 4.4/ 7 | 3-3.5 | Pakistan | | 20083512 | 2008-10-29 17:09:13.0 | 30.74 | 67.76 | 15 | 12 | - | 4.4/ 8 | 3-3.5 | Pakistan | | 20083513 | 2008-10-29 18:06:26.0 | 30.56 | 67.78 | 15 | 16 | - | 4.5/ 8 | 3.5-4 | Pakistan | |
| Macroseismic manifestations |
| In accordance with ITAR TASS agency after the earthquake 28.10.2008 it was killed at least 150 people, nearly one thousand were injured. More than 15000 people became homeless and left the area of catastrophe in panics. Fig. 4 downloaded from NEIC USA presents the map of instrumental intensity. |
Figure 4 |
|
| Focal mechanism and seismic moment of the earthquake |
| Focal mechanism solutions of the origin 28.10.2008 were obtained with TMC techniques in NEIC USA, USGS and HRVD (Global CMT Catalog) and are presented in table 2 and shown on fig. 5,6.
In both solutions this earthquake has happened under the action of the close in value compression and expansion strengths.
In accordance with USGS the type of motion along both steeply falling planes – slide with thrust components: right side slide motion along NP1 having N-W direction of propagation and left side – along NP2 with N-E direction of propagation. The axis of expansion oriented to the N-E, the axis of compression – to the south.
In accordance with HRVD the type of motion along both steeply falling planes also is characterized by the slide motion, but with uplift components: right side slide along NP1 of N-W direction of propagation and left side – along NP2 with N-E direction of propagation. Axis of expansion was oriented to the West, axis of compression – to the South.
Averaged value of seismic moment Мо of the earthquake 28.10.2008 obtained in IPC GS RAS from Р-wave spectra at two stations: Obninsk (Δ 32.8º) and Yakutsk (Δ 50.4º) made Мо=4.45* 10** 18 n*m, the value of moment magnitude calculated from Kanamori formula Mw=6.4;
Averaged seismic moment Мо of the earthquake 28.10.2008 in accordance with USGS makes 4.8* 10** 18 n*m, the value of moment magnitude Mw=6.4; in accordance with HRVD Мо=4.78* 10** 18 n*m, Mw=6.4.
|
| Table 2 |
| Axes of main strengths |
Nodal planes |
Center |
| T |
P |
N |
NP1 |
NP2 |
| Pl |
Azm |
Pl |
Azm |
Pl |
Azm |
Stk |
Dp |
Slip |
Stk |
Dp |
Slip |
| 18 | 70 | 30 | 172 |
53 | 314 | 304 | 82 | -143 | 208 |
55 | -8 | NEIC | | 14 | 261 | 2 | 170 |
76 | 73 | 305 | 79 | 171 | 36 |
81 | 11 | HARVARD | |
| NEIC - National Earthquakes Information Center of US Geological Service |
| HARVARD - Harvard Geophysical Center (USA) |
Figure 5 | 
Figure 6 |
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