Information message about destructive earthquake in Kyrgyzstan on October 5, 2008.

     The earthquake with М=6.6 has occurred on October 5, 2008 at 3:52 pm. GMT (19:52 Moscow time) in the Southern part of Tian Shan mountains, on the territory of Kyrgyzstan, which 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 22 min after registration to the Ministry of Emergency of the Russian Federation (EMERCOM).
     Preliminary processing has been done with data from 36 stations, accurate processing - with data 47 stations.
     Fig. 1 presents fragments of records from digital stations Ala Archa (∆ 3.2º), Kurchatov (∆ 11.7º), Garni (∆ 22.3º), Kislovodsk (∆ 23.5º), Obninsk (∆ 29.2º). Fig. 2 presents fragments of records from digital stations Yakutsk (∆ 40.3º), Kashpersky Gori (∆ 43.1º), Vladivostok (∆ 43.1º), Seimchan (∆ 50.7º), Petropavlovsk (∆ 56.9º).

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 15-52-49.2 39.5 73.72  40  47  6.6/176.4/197-7.5 157 IPC GS RAS (Accurate)
2 15-52-49.2 39.49 73.75  40  36  6.6/126.4/137-7.5 209 IPC GS RAS (Preliminary)
3 15-52-49.6 39.58 73.76  40  362   6.3  31 CSEM
4 15-52-50.9 39.54 73.77  35  205   6.3/193  NEIC (Preliminary)
5 15-52-49.3 39.52 73.77  28  299  6.9/1876.3/241 22 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 (yellow star on fig. 3) was located in the border area between Kyrgyzstan – Tajikistan - China, at 195 km ESE of Fergana, at 390 km S of Bishkek, at 430 km E of Dushanbe, at 495 km SE of Alma-Ata. Epicenter of this earthquake on October 5, 2008 was located within the margins of South-Gissar deep rupture (fig. 4), being the border line between South Tian-Shan and Tajik depression. It runs along the whole Tajikistan, passing Dushanbe and Garm and over the southern part of Kyrgyzstan to Afghanistan. Fig. 4 Seismic active zones of Tajikistan and deep ruptures I–IV – seismic active zones: South-Western Tian-Shan, Southern Tian-Shan, Pamir-Gindukush (crust), Pamir-Gindukush (deep) respectively; 5 – deep rupture and it’s number. The most important deep ruptures of Tajikistan and Northern Afghanistan by [Achilov G.Sh., Babaev A.M., Mirzoev K.M., Mikhailova R.S. Seismo generation zones of Pamir // Geology and geophysics of Tajikistan. – № 1. – Dushanbe: Donish, 1985. pp. 117–138.]: 1 - North-Fergana; 2 - Zaamin-Khaidarakansky (South-Fergana); 3 - South-Gissarsk; 4 - Iliasko-Vakhshsky; 5 - Darvaz-Zaalaisky; 5 - Afghan-North-Pamir; 6 - Vanch-Akbaitalsky; 7 - Karakulsko-Sarezsky; 8 - Bartang-Pshartsky; 8 - Rushano-North-Pshartsky; 9, 10 - Afghan-South-Pamir; 11 - Alburz-Mormulsky; 12 - Andarab-Mirzavalangsky.

    Figure 3
    Figure 4
    Aftershock
         GS RAS has registered 14 aftershocks with magnitudes from 3.8 to 5.8 within 18 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
    200832452008-10-05 16:11:09.039.5473.924026-5.8/ 105-5.5 Tajikistan-Xinjiang border reg.
    200832462008-10-05 16:36:18.039.6673.933312-4.9/ 33-3.5 Tajikistan-Xinjiang border reg.
    200832472008-10-05 16:52:54.039.5374.05338-4.9/ 43-3.5 Southern Xinjiang, China
    200832482008-10-05 17:33:54.039.8673.533311-4.4/ 72-2.5 Tajikistan-Xinjiang border reg.
    200832492008-10-05 18:27:41.039.6573.433328-5.4/ 84.5 Tajikistan-Xinjiang border reg.
    200832512008-10-05 21:46:04.039.5373.833310-4.9/ 33-3.5 Tajikistan-Xinjiang border reg.
    200832562008-10-05 22:52:12.039.5373.66338-4.3/ 3-Tajikistan-Xinjiang border reg.
    200832572008-10-05 23:08:03.039.8373.47336-4.0/ 3-Tajikistan-Xinjiang border reg.
    200832522008-10-05 23:47:38.039.773.563312-4.5/ 52-2.5 Tajikistan-Xinjiang border reg.
    200832542008-10-06 00:50:55.039.7173.62338-4.5/ 42-2.5 Tajikistan-Xinjiang border reg.
    200832552008-10-06 02:14:55.039.3573.413314-4.0/ 4-Tajikistan-Xinjiang border reg.
    200832582008-10-06 02:25:45.039.5973.393314-3.8/ 2-Tajikistan-Xinjiang border reg.
    200832592008-10-06 07:50:30.039.6573.813315-5.1/ 103.5-4 Tajikistan-Xinjiang border reg.
    200832622008-10-06 09:30:51.039.7973.513330-4.7/ 92.5-3 Tajikistan-Xinjiang border reg.
    Macroseismic manifestations
         In accordance with mass media the half of the nearest to the earthquake Nura settlement was destroyed, this is 115 houses. More than 70 people were killed and hundreds injured. More accurate information will be obtained after the end of rescue works. This earthquake was felt in Tajik capital Dushanbe – with intensity 3-4, In Kazakh settlement Taraz – with intensity 3-4, in Alma Ata – with intensity 2-3.
    Historical records
         Fig.5 presents the strongest earthquakes of Southern Tian Shan with М>=6 in accordance with "New catalogue of the strongest earthquakes of USSR territory " and Seismological bulletin of GS RAS (Obninsk). The earthquake on October 5 has happened in highly seismic active area of Southern Tian Shan. In this region there were registered numerous sensitive earthquakes with М>6: 18.12.1895, М=6.0 Io=5, 19.10.1903 М=6.2 Io=5, 1.12.1918 at 02-35 and at 10-35 with М=6.5, Io=5, 5.04.1943 with М=6.5, Io=5, 15.03.1944 with М=6, Io=5, 29.08.1963 with М=6.4, 11.05.1967 with М=6.3, Io=4. The most significant earthquake of Pamir area has occurred on 11.08.1974 with М=7.3, Io=6-7 and was accompanied with series of repeating shocks, some of them had magnitudes М=6.3 and 6.0. Epicentral zone of this strongest earthquake was located approximately at 20 km to the south from epicenter of the earthquake on October 5, 2008. After this strongest earthquake at least three earthquakes with magnitudes 6 and more have happened close to the reported here event: 1.11.1978 М=6.8, 16.12.1983 М6.1 and 17.04.1990 М=6.

    Figure 5
    Focal mechanism and seismic moment of the earthquake
         Focal mechanism solutions of the earthquake 5.10.2008 have been calculated with TMC method in NEIC USA, USGS and Harvard Center USA (Global CMT Catalog), they are presented in table 2 and shown on fig. 6, 7. These solutions are close to each other, the type of motion along both planes – uplift. The earthquakes has occurred and the action of compression forces oriented north-south (for USGS the axis of compression was oriented to the north, for HRVD – to the south). Both nodal planes have north-east direction of propagation and rather steep falling. The value of seismic moment Мо obtained in IPC GS RAS from Р-wave spectra at two stations: Obninsk (Δ 29.2º), Yakutsk (Δ 40.2º) makes Мо=1.0* 10** 19 n*m, the value of moment magnitude calculated from Kanamori formula makes Mw = 6.6; The value of seismic moment Мо of the earthquake 5.10.2008 in accordance with USGS makes 1.0* 10** 19 n*m, the value of moment magnitude Mw = 6.6; and in accordance with HRVD Мо=1.11* 10** 19 n*m, Mw = 6.6.
    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
    812520343 873654578262 46102NEIC
    85492162 5252774797247 4383HARVARD
  • NEIC - National Earthquakes Information Center of US Geological Service
  • HARVARD - Harvard Geophysical Center (USA)

    • Figure 6
    Figure 7


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