Information message about sensitive earthquake in Kuzbass area, June 18, 2013

     The sensitive earthquake with M=5.2 has occurred in Kuzbass area on June 18, 2013 at 23:02 GMT (June 19, 03:02 Moscow time).
     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 15 min after registration to the Ministry of Emergency of the Russian Federation (EMERCOM).
     Preliminary processing has been done with data from 49 stations, accurate processing - with data 57 stations.
     Fig. 1 presents fragments of records obtained from digital stations Gzhazator (∆ 4.6º), Kurchatov (∆ 5.8º), Borovoe (∆ 9.5º), Talaya (∆ 10.9º), Ala-Archa (∆ 13.9º). Fig. 2 presents fragments of records obtained from digital stations Arti (∆ 15.8º), Tiksi (∆ 25.2º), Obninsk (∆ 28.2º), Kislovodsk (∆ 29.8º), Garni (∆ 31.0º).

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 23-02-07.6 54.24 86.15  10  57  5.2/205.8/197-7.5 52 IPC GS RAS (Accurate)
2 23-02-07.8 54.24 86.14  10  49   5.8/157-7.5 53 IPC GS RAS (Preliminary)
3 23-02-10.9 54.31 86.33  15  339  Mw 5.3 5.4/94 17 CSEM
4 23-02-09.9 54.242 86.149  9.81  85  Mw 5.3   18 NEIC
5 23-02-09.6 54.34 86.16  10    К 14    ASRIPC
6 23-02-10.0 54.27 86.15  10    К 13.5    KNIIGiMS
  • 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
  • ASRIPC - Regional Informational Processing Center of Altai-Saiyany Experimental-Methodical Seismological Expedition Geophysical Survey Siberian Branch Russian Academy of Sciences
  • KNIIGiMS - KNIIGiMS
    • Epicenter
         Fig. 3 presents with red star epicenter of this earthquake which origin was located in Kemerovo Region at the depth of 10 km, 5 km W of Starobachatov, 5 km SE of Bachatsk, 85 km NW of Novokuznetsk, 126 km S of Kemerovo and 225 km ESE of Novosibirsk.

    Figure 3
    Macroseismic manifestations
         According to GS RAS this earthquake was felt in Bachatsk with intensity 6, in Novokuznetsk with intensities 4-5, in Barnaul, Novosibirsk and Kemerovo with intensities 3-4 and in Tomsk with intesity 2 MSK.
    Historical records
         Altai-Sayansk area which includes Kemerovo Region does not belong to seismic active regions of Russian territory. However each event with К>12 may carry significant info about the seismic process in this region. This area of Russian territory includes the northern part of seismic intensive zone – North-Eastern Baikal branch of Alps-Himalayas seismic belt. Seismic activity in this region is quickly attenuating, while the scattered weak seismicity propagates far to the north up to the parallels of Novosibirsk and Krasnoyarsk. This region of Russia is known for the presence of earthquakes with M<6 (K<15). Historical and macroseismic information about small sensitive earthquakes is available for the vast territory of the basins of the river Ob, from its headwaters to Novosibirsk City and from river Yenisei up to Krasnoyarsk City and for the watershed - ore regions of Altai. Some earthquakes in these parts of Russia have reached the intensity of 7 MSK: in Kuznetsk in 1898 and 1903., in Kamen-na-Obi - February 15, 1965 with a magnitude M=5.5. A number of notable earthquakes were registered in the instrumental period near Novokuznetsk. These include the earthquake Prokopevskoe September 14, 1995 with a magnitude Ms=4.7 and intensity 5-6 MSK. It occurred in a densely populated industrial area of Kuzbass and caused wide public resonance. Figure 4 presents the map with epicenters of the earthquakes for the period from 1761 to 2010 [Emanov et al 2011]. The completeness and reliability of information about earthquakes in different intervals of this period varies. However, this figure clearly demonstrates proximity of these earlier registered epicenters of the earthquakes to the epicenter of currently reported earthquake of June 18, 2013.

    Figure 4
    Focal mechanism and seismic moment of the earthquake
         Focal mechanism solution of this earthquake was calculated in IPC GS RAS with signs of initial arrivals of P waves at 27 stations, including 19 stations which registered the waves of compression (plus signs) and 8 stations which registered the waves of extension (minus signs). These stations are located in the interval of epicentral distances 6–90º and in the interval of azimuths 10º–310º. Focal mechanism of the origin in stereographic projection at the lower hemisphere is presented at fig. 5, elements of mechanism are presented in table. 2. This earthquake has occurred under prevailing action of compression stresses oriented to the north-west. One nodal plane NP1 is nearly vertical (DP=71º), is strikes south-east (STK=132º), another plane NP2 is more flat (DP=21º) it strikes almost along the latitude (STK=284º). The type of motion for NP1 is uplift and for NP2 over thrust fault. Seismic moment of the earthquake was obtained in IPC GS RAS with spectra of Р waves at the station «Obninsk» (∆28.19º), it makes Мо=1.0*10**17 N*m, Mw=5.3.
    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
    635725214 930913271100284 2163IPC GS RAS
  • IPC GS RAS - Informational Processing Center, Geophysical Survey, Russian Academy of Sciences

    • Figure 5


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