Information message about destructive earthquake in Pakistan on September 24, 2013 |
| The destructive earthquake with M=7.7 has occurred on September 24, 2013 at 11:29 GMT (15:29 Moscow time) in Pakistan, it caused victims and damage. |
| 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 11 min after
registration to the Ministry of Emergency of the Russian Federation (EMERCOM). |
| Preliminary processing has been done with data from 38 stations, accurate processing - with data 80 stations. |
| Fig. 1 presents fragments of records obtained from digital stations Ala-Archa (∆ 17.2º), Garni (∆ 21.6º), Nalchik (∆ 24.2º), Kislovodsk (∆ 25º), Kurchatov (∆ 25.7º). Fig. 2 presents fragments of records obtained from digital stations Borovoe (∆ 26.2º), Arti (∆ 29.8º), Obninsk (∆ 35.1º), Talaya (∆ 37.8º), Lovozero (∆ 44.9º). |
Figure 1
| 
Figure 2
|
|
| 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 |
11-29-47.9 |
27.03 |
65.52 |
20 |
80 |
7.7/45 | 6.9/39 | 9.5-10 | 82 | IPC GS RAS (Accurate) | | 2 |
11-29-50.3 |
27.41 |
65.57 |
10 |
38 |
| 6.7/28 | 9.5-10 | 82 | IPC GS RAS (Preliminary) | | 3 |
11-29-49.4 |
27.07 |
65.561 |
20 |
467 |
Mw 7.7 | | | 23 | CSEM | | 4 |
11-29-48.9 |
27 |
65.514 |
20 |
216 |
Mw 7.7 | | | 22 | NEIC | |
| 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 |
| Fig. 3 presnts epicenter of this earthquake with red star, it's origin was located on the territory of Pakistan, at the depth of 20 km, 278 km N-N-E of Karachi, Pakistan, 340 km N-E of Hyderabad, Pakistan and 533 km S-E of Zahedan, Iran. |
Figure 3 |
|
| Aftershock |
| GS RAS registered 11 aftershocks with М>=4.7 within 11 hours after 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 |
| 20133363 | 2013-09-24 11:36:29.0 | 27.3 | 65.66 | 20 | 39 | - | 6.0/ 24 | 6.5-7 | Pakistan | | 20133364 | 2013-09-24 12:07:04.0 | 27.23 | 65.65 | 10 | 21 | - | 4.9/ 14 | 5-5.5 | Pakistan | | 20133365 | 2013-09-24 12:42:11.0 | 27.32 | 65.6 | 20 | 39 | - | 5.2/ 28 | 4.5-5 | Pakistan | | 20133366 | 2013-09-24 13:01:39.0 | 27.44 | 65.72 | 20 | 55 | - | 5.8/ 42 | 6-6.5 | Pakistan | | 20133367 | 2013-09-24 14:08:33.0 | 27.65 | 65.76 | 20 | 50 | - | 5.4/ 28 | 5-5.5 | Pakistan | | 20133368 | 2013-09-24 15:12:22.0 | 27.13 | 65.7 | 20 | 31 | - | 5.0/ 17 | 4-4.5 | Pakistan | | 20133370 | 2013-09-24 17:20:13.0 | 27.2 | 65.58 | 20 | 46 | - | 5.6/ 32 | 5.5-6 | Pakistan | | 20133371 | 2013-09-24 19:54:06.0 | 27.5 | 65.71 | 20 | 27 | - | 4.7/ 16 | 3.5-4 | Pakistan | | 20133372 | 2013-09-24 21:59:02.0 | 27.57 | 65.83 | 20 | 36 | - | 5.0/ 25 | 4-4.5 | Pakistan | | 20133373 | 2013-09-24 22:38:16.0 | 27.26 | 65.49 | 20 | 23 | - | 4.8/ 17 | 3.5-4 | Pakistan | |
| Macroseismic manifestations |
| According to RIA-Novosti as a result of this earthquake 348 persons were killed. Nearly 20 thousand houses were destroyed or seriously damaged. Almost 90% of buildings were damaged in Avaran town. Chief minister of Balochistan Province Mr. Abdul Ballodge announced emergency situation in the region. Military personnel and border guards were sent to support the rescue teams.
The shocks were felt in Hyderabad, Larkana and other settlements. Indian media reported about weak shocks which were felt in New-Delhi and other parts of northern India.
Fig. 4 obtained from USGS NEIC presents the USGS Community Internet Intensity Map made by 50 responses in 20 cities. |
Figure 4 |
|
| Historical records |
| This earthquake has occurred 361 km E-S-E of strong earthquake on April 16, 2013 with mb=7.8 (yellow star on fig. 5). |
Figure 5 |
|
| Focal mechanism and seismic moment of the earthquake |
| Focal mechanism of this earthquake was calculated in IPC GS RAS on the P-wave first-motions at 125 stations, 79 stations registered compression waves (plus signs) and 46 stations registered expansion waves (minus signs) at distances 8–95º and dispersed rather evenly along the azimuths. The fig.6 shows a focal mechanism solution in stereographic projection at the lower hemisphere, elements of focal mechanism are presented in table.2.
Fig. 7, 8 show focal mechanism derived with W-phase from the estimated moment tensor in USGS NEIC and focal mechanism derived from the estimated CMT in Quick CMT Catalog, USA.
Both solutions are close. This earthquake has occurred under the action of close in value compression stresses oriented to the south and expansion stresses oriented to the east. One nodal planeь NP2 in all solutions is almost vertical (DP=86-89º) and it is oriented north-west (STK=309-322º) – south-east (STK=134º), another nodal plane NP1 is more flat (DP=46-47º) and oriented south-west. The type of motion along NP2 is right hand slips with fault components (IPC GS RAS and СМТ solutions) and reverse fault (USGS NEIC solution). For NP1 – left hand slips (with fault components for IPC GS RAS, reverse fault components for USGS NEIC) and «pure» slip for CMT.
Averaged value of seismic moment was obtained in IPC GS RAS with Р wave spectra registered at two stations: «Obninsk» (∆35.07º) and «Talaya» (∆37.77º) Мо=1.0*10**20 N*m, Mw=7.3. According to USGS NEIC – Мо=1.42*10**20 N*m, Mw=7.7; according to Quick CMT – Мо=4.81*10**20 N*m, Mw=7.7. |
| 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 |
| 26 | 87 | 32 | 194 |
47 | 326 | 228 | 48 | -5 | 322 |
86 | -137 | IPC GS RAS | | 33 | 81 | 45 | 309 |
45 | 309 | 228 | 46 | 6 | 134 |
86 | 136 | NEIC | | 27 | 75 | 30 | 183 |
47 | 312 | 218 | 47 | -2 | 310 |
86 | -137 | Quick CMT | |
| IPC GS RAS - Informational Processing Center, Geophysical Survey, Russian Academy of Sciences |
| NEIC - National Earthquakes Information Center of US Geological Service |
| Quick CMT - Quick CMT catalog |
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