Information message about the strong earthquake in Sakha Republic on February 14, 2013 |
| The strong earthquake with M=6.9 has occurred on February 14, 2013 at 13:13 GMT (17:13 Moscow time) in Sakha Republic. |
| 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 36 stations, accurate processing - with data 73 stations. |
| Fig. 1 presnts fragments of records obtained from digital stations Seimchan (∆ 6.2º), Magadan (∆ 8.8º), Bilibino (∆ 9º), Severo-Kurilsk (∆ 18.2º), Kuldur (∆ 19.2º). Fig. 2 presnts fragments of records obtained from digital stations Tajon (∆ 32.4º), Lovozero (∆ 35.9º), Borovoe (∆ 36.3º), Arti (∆ 37.9º), Obninsk (∆ 46º). |
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 |
13-13-51.1 |
67.57 |
142.69 |
10 |
73 |
6.9/30 | 6.8/29 | 9.5-10 | 61 | IPC GS RAS (Accurate) | | 2 |
13-13-51.8 |
67.58 |
142.54 |
10 |
36 |
| 6.8/28 | 9.5-10 | 67 | IPC GS RAS (Preliminary) | | 3 |
13-13-53.0 |
67.617 |
142.662 |
10 |
773 |
Mw 6.6 | | | 25 | CSEM | | 4 |
13-13-53.1 |
67.58 |
142.593 |
10.1 |
654 |
| 6.6/593 | | 29 | 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 presents with red star epicenter of this earthquake which origin was located in Sakha Republic, at the depth of 10 km, 97 km S-W of Syagannakh, 125 km N-W of Khonuu. |
Figure 3 |
|
| Aftershock |
| GS RAS registered 9 aftershocks with M≥4.4 within ten 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 |
| 20130619 | 2013-02-14 13:28:04.0 | 67.6 | 141.96 | 10 | 33 | - | 4.9/ 9 | 5-5.5 | Eastern Siberia, Russia | | 20130620 | 2013-02-14 13:44:29.0 | 67.81 | 142.6 | 10 | 23 | - | 4.9/ 8 | 5-5.5 | Eastern Siberia, Russia | | 20130624 | 2013-02-14 13:47:14.0 | 67.58 | 142.74 | 10 | 19 | - | 4.8/ 6 | 4.5-5 | Eastern Siberia, Russia | | 20130631 | 2013-02-14 13:52:14.0 | 67.65 | 142.38 | 10 | 14 | - | 4.6/ 6 | 4.5 | Eastern Siberia, Russia | | 20130616 | 2013-02-14 15:08:33.0 | 67.69 | 142.58 | 10 | 43 | - | 5.1/ 10 | 5.5-6 | Eastern Siberia, Russia | | 20130617 | 2013-02-14 15:14:55.0 | 67.85 | 142.53 | 10 | 35 | - | 5.0/ 11 | 5-5.5 | Eastern Siberia, Russia | | 20130621 | 2013-02-14 16:10:57.0 | 67.79 | 142.78 | 10 | 16 | - | 4.4/ 5 | 4 | Eastern Siberia, Russia | | 20130630 | 2013-02-14 17:17:40.0 | 67.58 | 142.34 | 10 | 39 | - | 4.8/ 10 | 4.5-5 | Eastern Siberia, Russia | | 20130623 | 2013-02-14 20:26:13.0 | 67.63 | 142.74 | 10 | 31 | - | 4.9/ 10 | 5-5.5 | Eastern Siberia, Russia | |
| Macroseismic manifestations |
| In accordance with GS RAS data this earthquake was felt: in Kubergan with intensities 6-7, in Deputatskii, Suturuokha with with intensities 5-6, in Belaya-Gora, Verkhoyansk, Batagai, Ece-Haya and Boronuk with intensity 5, in Khonuu with intensities 4-5, in Saidy with intensity 4 and in Ust-Nera with intensities 3-4 of MSK-64 scale. |
| Focal mechanism and seismic moment of the earthquake |
| Focal mechanism solutions of the origin of this earthquake were obtained in NEIC – USGS, and Global CMT Catalog, USA, they are presented in table 2 and figures 4,5. Both solutions are almost identical. The earthquake has occurred under the action of compression forces oriented N–E (in case of USGS) and S-W (in case of Quick CMT). Nodal planes have N-W (NP1) / S-E (NP2) directions of propagation and intermidiate value od declination angles (DP=40º-56º), that allows to suggest uplift or overthrust nature of motion in the origin, with insiginificant components of right side slip along NP1 and left side slip along NP2. The value of seismic moment Мо in accordance with USGS makes Mo=1.3*10**19 N*m, the value of moment magnitude Mw=6.7; in accordance with Global CMT Catalog – Mo=1.2*10**19 N*m, Mw=6.7. |
| 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 |
| 69 | 291 | 9 | 45 |
19 | 138 | 331 | 56 | 113 | 113 |
40 | 60 | NEIC | | 73 | 327 | 5 | 220 |
17 | 128 | 327 | 42 | 115 | 115 |
52 | 69 | Quick CMT | |
| NEIC - National Earthquakes Information Center of US Geological Service |
| Quick CMT - Quick CMT catalog |
Figure 4 | 
Figure 5 |
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