Information message about sensitive earthquake in Dagestan on April, 2013

     The sensitive earthquake with M=5.1 has occurred in Dagestan on April 16, 2013 at 12:26 GMT (16:26 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 14 min after registration to the Ministry of Emergency of the Russian Federation (EMERCOM).
     Preliminary processing has been done with data from 42 stations, accurate processing - with data 50 stations.
     Fig. 1 presents fragments of records obtained from digital stations Derbent (∆ 0.6º), Akhty (∆ 0.9º), Botlikh (∆ 1.2º), Vedeno (∆ 1.3º), Grozny (∆ 1.6º). Fig. 2 presents fragments of records obtained from digital stations Garni (∆ 3.3º), Neitrino (∆ 3.8º), Kislovodsk (∆ 4º), Dombai (∆ 4.6º), Arkhyz (∆ 4.9º).

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 12-26-57.8 42.45 47.78  10  50   5.1/17652 IPC GS RAS (Accurate)
2 12-26-57.8 42.43 47.77  10  42   5.1/13652 IPC GS RAS (Preliminary)
3 12-27-00.0 42.608 47.811  10  279   4.9  86 CSEM
4 12-26-59.7 42.523 47.698  10  142   4.8/125 104 NEIC
5 12-26-57.8 42.26 47.68  10  24  4.4   128 NCOB GSRAS
6 12-26-57.4 42.239 47.744  3.4  29   4.8 ML  256 RSSC
  • 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
  • NCOB GSRAS - Northern Caucasus operative bulletin of GS RAS
  • RSSC - Republican Seismic Survey Center of Azerbaijan National Academy of Sciences
    • Epicenter
         Fig. 3 presents with red star epicenter of this earthquake, which origin was located in Dagestan at the depth of 10 km, 6 km E-N-E of Murego, 13 km N-E of Kichi-Gamri, 17 km S-W of Izberbash and 65 km S-S-E of Makhachkala.

    Figure 3
    Macroseismic manifestations
         In accordance with GS RAS this earthquake was felt in Mamaaul, Baltamakhi, Murguk, Kanasiragi, Burdeki and Kichi-Gamri with intensity 6, in Murego, Nizhny Makharchimakhi, Alkhadzhakent, Gasha, Urakhi, Verkhny Makharchimakhi and Utamysh with intensity 5-6, in Sergokala and Kayakent with intensity 5 and in Makhachkala with intensity 3.
    Historical records
         This eaerhqaueke of April 16, 2013 has occurred near epicenter of the strong 7-8 MSK Kichigamrinsk earthquake of 3.05.1988 (fig.4). Histrorically this place is known as the region of the earthquakes with intensity 6-7.

    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 41 station including 22 stations which registered compression waves (plus signs) and 19 stations which registered expansion waves (minus signs). These stations are located in the interval of epicentral distances of 0.5-60 º and dispersed along the azimuth rather evenly. Focal mechanism solution in stereographic projection at the lower hemisphere is presented at figures 4, 5, this figure also presents focal solution for the origin of another earthquake of 03.05.1988 with Мw=5.3 which was obtained by Harvard Center (USA). Elements of focal solution mechanism of currently reported earthquake of April 16, 2013 are presented in table 2. This earthquake has occurred under the action of compression forces oriented N-N-E. One nodal plane NP2 is steeply falling (DP=75) and propagates N-W, the type of motion along it – uplift with right hand slip component. Another plane NP1 is laying rather flat (DP=40) and propagates N-E, the type of motion along it – left hand slip.
    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
    472572011 36117574024308 75128IPC GS RAS
  • IPC GS RAS - Informational Processing Center, Geophysical Survey, Russian Academy of Sciences

    • Figure 5


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