Information message about sensitive earthquake occurred in Chechen Republic on January 13, 2011 | | Sensitive earthquake with М=4.5 has occurred in Chechen Republic of Russia on January 13, 2011 at 2:50 GMT (5:50 Moscow time). | | Preliminary processing has been done with data from 17 stations, accurate processing - with data 29 stations. | | Fig. 1 presents fragments of records obtained from digital stations Grozny (∆ 0.4º), Lesken (∆ 1.8º), Nalchik (∆ 2º). Fig. 2 presents fragments of records obtained from digital stations Neitrino (∆ 2.6º), Kislovodsk (∆ 2.7º), Gofitskoe (∆ 2.9º). |
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 |
02-50-10.7 |
43.38 |
46.33 |
10 |
29 |
| 4.5/4 | 4-5 | 83 | IPC GS RAS (Accurate) | | 2 |
02-50-11.0 |
43.4 |
46.33 |
10 |
17 |
| 4.5/5 | 4-4.5 | 142 | IPC GS RAS (Preliminary) | | 3 |
02-50-13.8 |
43.4 |
46.27 |
10 |
79 |
| 4.3 | | 65 | CSEM | | 4 |
02-50-11.6 |
43.3 |
46.29 |
10 |
24 |
| 4.2/11 | | 72 | NEIC | | 5 |
02-50-09.3 |
43.41 |
46.37 |
1 |
4 |
ML 4.4 | | | | UNSSPG | | | 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 | | UNSSPG - United National Survey for Seismic Protection , Georgia | | Epicenter | | Fig. 3 depicts with red star epicenter of this earthquake, which origin was located on the territory of Chechen Republic at the depth of 10 km, this is 15 km N-E from Oyskhara, 20 km E-N-E from Gudermes, 60 km S-W from Kizlyar. | 
Figure 3 |
| | Aftershock | | GS RAS registered 4 foreshocks with М>=3.7 and 2 aftershocks: with М=3.9 in 32 minutes after the main shock and with М=4 in 25.5 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 |
| 20110151 | 2011-01-12 16:11:25.0 | 43.22 | 46.28 | 10 | 11 | - | 3.7/ 1 | 2-2.5 | Eastern Caucasus | | 20110153 | 2011-01-12 22:05:38.0 | 43.16 | 46.27 | 10 | 15 | - | 4.0/ 3 | 3 | Eastern Caucasus | | 20110154 | 2011-01-12 22:32:05.0 | 43.15 | 46.24 | 10 | 13 | - | 3.7/ 2 | 2-2.5 | Eastern Caucasus | | 20110155 | 2011-01-12 22:34:27.0 | 43.15 | 46.29 | 10 | 10 | - | 3.7/ 2 | 2-2.5 | Eastern Caucasus | | 20110158 | 2011-01-13 03:22:43.0 | 43.18 | 46.24 | 10 | 14 | - | 3.9/ 2 | 2.5-3 | Eastern Caucasus | | 20110182 | 2011-01-14 04:27:22.0 | 43.37 | 46.38 | 10 | 13 | - | 4.0/ 2 | 3 | Eastern Caucasus | | | Macroseismic manifestations | | This earthquake was felt in Kurchaloy, Oyskhara, Mayrtup with intensities 4-5 MSK. | | Historical records | | This earthquake has occurred in origin zone of Kurchaloy earthquke which happened on October 11, 2008 , this is the place of Tersk-Sunzhensk seismic generating area of Tersk-Caspian marginal basin.
Tersk-Sunzhensk seismic generating area is characterized by increasing activity in mantle and crust in 2000–2008. Most of this activity is observed in two zones [Dr. Nesmeyanov and others., 1996]: in Benoisk-Eldarovsk zone and in Gudermes zone. The bunches of weak earthquakes were registered in Mozdok subzone since 2001 till 2008. Goragorsk node is located in the intersection between fault buried zone, stretching along Mozdok subzone and buried Paleozoic fault, the earthquakes are registered here at two depths: in lower-upper mantle and upper and average crust. Gudermes zone is located to the west and has identical direction of propagation. The strong 7-8 MSK crust earthquake has occurred here on October 11, 2008, it was called Kurchaloisk earthquake with Мw=5.8 – this was the strongest earthquake of Northern Caucasus in this century. Seismic tectonics location of it’s origin is determined by belonging to Gudermes buried stretch-shift seismic generation zone of along latitudinal direction of propagation [Dr.Nesmeyanov and others, 1996].
Tersk-Sunzhensk seismic generation zone ia highly seismic active [Dr. Nikonov, 1989; Dr. Ulomov, 2006, 2007; Dr. Rogozhin, 2002]. In 1976 it was the place of Chernogorsk earthquake with intensity in epicenter of 8–9 MSK and М=6.4, and since the end of XIX century and up to XXI century this was the zone of more than 20 earthquakes with intensities of I06 MSK. Most significant of them is 8-MSK Tersk (Eldarovsk) earthquake of 1912 with М=5.7 and origin located in upper mantle; 7–8-MSK Vedenovskoe earthquake of 1933 with М=5.2 and a few 7-MSK earthquakes, which happened in 1785 (Dagestan-I), 1868, 1928 (Argun), 1966 (Argun-II), 1969 (Achkhoi-Martan), 1971 (Starogroznensk), 1974 (Salataussk). Chernogorsk earthquake of 1976 was accompanied with aftershocks. In 1984 two other earthquakes have occurred in the same epicentral zone with difference in time of nine hours and intensities 6–7 MSK and М=5.2–5.3, they were accompanied with numerous secondary shocks. After that less intensive earthquakes were registered in 100 km to the west and east from epicenter of the earthquake which happened on October 11: on August 3, 1989 with М=5.0, on January 31, 1999 with М=5.1, on October 12, 2006 with М=4.5 and origin in upper mantle. The nearest to the origin zone significant in intensity earthquakes happened here on March 31, 1950 called Gudermes-I with М=4.2, I0=6–7 MSK; on November 9, 1950 called Gudermes-II, М=5.0, I0=6 MSK.
|
|
|
