|Observatories and Research Facilities for EUropean Seismology|
|Volume 4, no 1||May 2002||Orfeus Newsletter|
The seismic network of the Geophysical Survey of the Russian Academy of SciencesO. Starovoit and V. Mishatkin
Geophysical Survey of Russian Academy of Science, 249020, Kaluga region, Obninsk, Lenin str. 189
The teleseismic network of the GS RAS operates around 30 seismic stations and a data center in Obninsk. All stations have broadband recording channels. Approximately half of them (14) have digital equipment; the others use shortperiod and longperiod channels with records on photographic paper. The equipment of 12 digital stations is made available by IRIS and is part of the Global Seismograph Network (GSN). The characteristics of the 12 stations are similar to those of the other GSN stations. The data of the digital stations are transmitted to the data center in Obninsk by telephone in a mode close to real time. Further, the datacenter of the teleseismic network regularly obtains data from other GSN stations and has access to a number of databases outside Russia. The computer network consists of 20 SUN computers and tens of PC's for data processing. The software that is used in the datacenter is developed by the staff of the GS RAS and allows all modern methods of data processing, including data collection in various modes, automatic detection and association of phases, definition of event parameters in an interactive mode and production of the bulletin of seismic events. Figure 1 illustrates the different procedures and data streams within the network and throughput to the archive, other networks and users.
An important component of the teleseismic network is the 24-hour-a-day service to determine the location and magnitude of significant earthquakes in Russia and around the world as rapidly and accurately as possible. Figure 3 shows all the BB stations integrated within the Alert Service of Geophysical Survey RAS.
This alert information is communicated to federal and regional government agencies which are responsible for emergency response and to scientific groups. Within less than 30 minutes after an earthquake the "URGENT WARNING" message is send to the Emercom of the Russian Federation, thus providing essential information in emergency situations where urgent measures are required. This includes assistance to stricken areas, life rescue operations and other hazard mitigation measures. Within less than 2 hours an "ALERT MESSAGE" is composed, which contains the origin time of the earthquake, the coordinates of the epicenter, depth of the source, the magnitude and possible destructive impact. For all earthquakes that are felt the intensity distribution is also shown. This "ALERT MESSAGE" is sent to the organizations of the Ministry of Emergency of the Russian Federation, the regional seismological centres of Russia and the countries of the CIS, interested state organizations of Russia and international datacentres. The datacenter of the teleseismic network archives the information of each earthquake in a database, which is accessible through its webpages.web together with the digital waveform data of the "Novosibirsk" station.
Baykal region. In the region between 48°-60° N and 96°-122° E the seismic monitoring is carried out by the Baykal regional network (networkcode BYKL). The BYKL network incorporates 24 stations, 13 of which have digital recording equipment, that operates within the frequency range of 0,5-10 Hz and a dynamic resolution of 15-17 bit. The network records annually more than 4000 earthquakes of all sizes. The datacenter of this network is situated in Irkutsk and the seismic events are published in "the Bulletin of earthquakes of Baykal".
Seismic monitoring of the republic Dagestan in the eastern part of
Northern Caucasus is provided by the Dagestan regional network
(networkcode DRS). The datacenter of the DRS network is situated in
The network consists of 17 stations equipped with shortperiod
seismometers and analog recording.
Figure 5. Map of the Kamchatka regional network.
Kola peninsula region.
Seismic monitoring of the Kola peninsula, Karelia, the Arkhangelsk
area and Spitsbergen is carried out by the
Kola regional network (networkcode
KORS). The KORS network includes two digital broadband stations (APA and AMDR) and
two seismic arrays. The datacenter is situated in Apatity. Each month a
catalogue of earthquakes with the results of the processing is send by email to Obninsk.
Northern Caucasus region.
The regional network of the Northern Caucasus includes 7 permanent
stations, a local network with 5 radio telemetry stations and a
seismic array in the area of Kislovodsk. Two stationary stations, the local
network and the seismic array have digital recording. Besides the
data of the given networks also data from the Dagestan region network (DRS)
is used. The datacenter is situated in Obninsk.
The results of the data processing are presented in
"the Regional catalogue on the region of Northern Caucasus".
Yakut region. Seismic monitoring of the region of the republic Sakha is provided by the Yakut regional network (networkcode YARS). The YARS network consists of 13 stations. 2 broadband (TIXI and YAK) and 5 short-period stations covering the frequency range 0,02-7 Hz and a dynamic resolution of 16 bit have digital recording. The datacenter is situated in Yakutsk. Results of data processing are presented every 10 days.
GS RAS cooperates with international and national seismological centers especially for data exchange and integration in the global system of seismic monitoring. The Geophysical Survey of the RAS provides, with its scientific experts in the field of seismic monitoring and instrumentation, the rapid warning services for the central and local authorities and other departments with respect to earthquakes and its possible consequences. The GS RAS collects and archives the data in an extensive seismic database that is available for scientists and researchers: