Information message about the tangible earthquake in Kyrgyzstan December 1, 2015

     The tangible earthquake M=5.3 occurred December 1, 2015 at 06:13 GMT (09:13 Moscow time) in Kyrgyzstan.
     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 7 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 Ala-Archa (∆ 2.6º), Makanchi Array (∆ 8.5º), Borovoe (∆ 11.9º). Fig. 2 presents fragments of records obtained from digital stations Jazator (∆ 13º), Zalesovo Array (∆ 14.8º), Arti (∆ 17.8º).

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 06-13-41.0 41.35 73.21  33  50   5.3/225-6150 IPC GS RAS (Accurate)
2 06-13-44.6 41.62 73.17  60  42   5.3/204-5 IPC GS RAS (Preliminary)
3 06-13-44.2 41.4 73.27  50  301   5.2  37 CSEM
4 06-13-44.4 41.4 73.19  48  96   5.2/66 46 NEIC
5 06-13-42.0 41.36 73.25  26  18  K 12.5 5.6   IS NAS KR
6 06-13-44.0 41.64 72.36  7  17  K 12.2 5.5  238 KNDC
  • 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
  • IS NAS KR - Institute of Seismology National Academy of sciences of the Kyrgyz Republic
  • KNDC - Kazakhstan National Data Center
    • Epicenter
         Fig. 3 presents with red star the epicenter of this earthquake, its origin was located in Kyrgyzstan, at a depth of 33 km, 95 km N-E of Andizhan, 214 km S-W of Bishkek, the Capital of Kyrgyzstan, and 233 km W of Naryn.

    Figure 3
    Macroseismic manifestations
         According to Institute of Seismology of the National Academy of Sciences of the Kyrgyz Republic the earthquake was felt: in Kyzyl-Unkur, Jaz-Quechua Sites Ortok, Kara-Alma, Alma Kok - 5 MSK, Arslanbob, Ak-Took - 4-5, Kok Jangak, Kara-Kul - 4 MSK, Jalal-Abad, Toktogul- 3-4 MSK, Osh - 3 MSK. According to Kazakhstan National Data Center the earthquake was felt on the territory of Kazakhstan in Taraz - 3 MSK.
    Historical records
         The epicenter of this earthquake was located 110 km N of tangible earthquake November 17, 2014 М=5.5.
    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 37 stations, including 25 stations which registered compression waves (plus signs) and 12 stations which registered tensile waves (minus sign). These stations are located in the interval of epicentral distances of 0.9-96º and azimuth alignment Az=2-357º. Focal mechanism in stereographic projection at lower hemisphere is shown in Fig. 4, elements of the mechanism - in Table 2. This eathquake has occurred under the action of prevailing compression stress oriented south and tensile stress oriented east. Nodal plane NP1 is nearly vertical (DP=63º) and NP2 plane is flatter (DP=42º). Nodal plane NP1 strikes S-E, NP2 plane strikes S-W. The type of motion along NP1 - reverse fault with right latteral slip component along NP2 plane - left latteral slip with reverse fault components.
    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
    586512174 2927110763123232 4243IPC GS RAS
  • IPC GS RAS - Informational Processing Center, Geophysical Survey, Russian Academy of Sciences

    • Figure 4


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