Information message about sensitive earthquake in Tuva on Augist 4, 2009 |
| THe sensitive earthquake with М=5.1 has happened on Augist 4, 2009 at 16:20 GMT (20:20 Moscow time) in Tuva 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 27 min after
registration to the Ministry of Emergency of the Russian Federation (EMERCOM). |
| Preliminary processing has been done with data from 44 stations, accurate processing - with data 61 stations. |
| Fig. 1 presents fragments of three component record from digital station Talaya(∆ 4.4º). Fig. 2 presents fragments of records obtained from digital stations Borovoe (∆ 16.5º), Ala Archa (∆ 17.3º), Yakutsk (∆ 21.2º), Arti (∆ 23.2º), Obninsk (∆ 35.6º). |
Figure 1
| 
Figure 2
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|
| 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 |
16-20-38.0 |
50.71 |
96.84 |
15 |
61 |
5.1/24 | 5.4/28 | 6.5 | 101 | IPC GS RAS (Accurate) | | 2 |
16-20-37.4 |
50.66 |
96.87 |
15 |
44 |
5.1/23 | 5.4/23 | 6.5 | 104 | IPC GS RAS (Preliminary) | | 3 |
16-20-37.4 |
50.63 |
96.87 |
2 |
241 |
| 5.1/99 | | 96 | CSEM | | 4 |
16-20-38.7 |
50.59 |
96.88 |
10 |
87 |
| 5.0/67 | | 79 | NEIC | | 5 |
16-20-40.7 |
50.91 |
96.8 |
15 |
|
5.2 | | | | ASRIPC | | 6 |
16-20-38.1 |
50.8 |
96.7 |
15 |
|
К14.2 | | | | BB SD GS RAS | |
| 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 |
| BB SD GS RAS - Baikal Branch of Siberian Division of GS RAS |
| Epicenter |
| Fig.3 depicts with red star epicenter of this earthquake, which was located on the territory of Tuva Republic at the depth of 15 km., in 50 km. W-N-W from Kungurtuga, in 203 km. E-S-E from Kizil, in 498 km. S-E from Abakan and in 547 km. W-S-W from Irkutsk.
|
Figure 3 |
|
| Macroseismic manifestations |
| This earthquake was felt in Kizil with intensity 4 MSK, in Zakamensk with 3-4 MSK, in Irkutsk - with 2 MSK. |
| Historical records |
| This earthquake on August 4, 2009 has happened in seismic active region, which in accordance with the map of general seismic regionalization OCP-97-A belongs to 8-MSK zone of activity [Dr. Ulomov V.I., Dr. Shumilina L.S., 1999]. This regions is known for historical strong earthquakes, most significant of them are:
The earthquake on May 27, 1991 with M=4.9 – on the territory of Mongolia, which was felt in some living places of Tuva republic with intensity of 3-4 MSK.
Busingol earthquake on December 27, 1991 with M=6.5 – one of the most intensive for the whole period of instrumental observations in the eastern part of Busingol Region near Mongolian border. It was felt on the vast territory including Tuva Republic, some part of Irkutsk Region, Krasnoyarsk Region and Mongolia. This earthquake was accompanied with series of powerful aftershocks. [Publ. «USSR earthquakes in 1991», Moscow, 1997].
Aginsk earthquake on October 27,2000 – in the mouth region of Kann river, approximately 200 km S-E from Krasnoyarsk, felt around the whole southern part of the region with intensities from 2 to 6-7 MSK [Publ. «North Eurasia Earthquakes in 2000», Obninsk, 2006]. The earthquake on August 16, 2008 with M=5.4 – at the border between Russia and Mongolia, felt on the territory of Irkutsk region with intensities up to 5-6 MSK (Irkutsk 3-4 MSK, Orlik 5-6 MSK) [Alert Service GS RAS, Obninsk, 2008].
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