Information message about earthquake on January 31 1999

     On January the 31-st 1999 at 8:07 am Moscow time (5:07 am GMT) strong earthquake has happened in Dagestan, which was felt in a number of places with intensity 5-6 MSK.
     Parameters of this earthquake have been determined in Alert Service (AS) of Information Processing Center (IPC) of Geophysical Survey of RAS in Obninsk with the use of stationary data, obtained from digital and analog seismic stations of Russia,countries of CIS and from abroad As it is seen the identity of data in determination of parameters of the earthquake by different centers is satisfactory, the biggest difference is in coordinates of epicenter, which makes 0.09 degr. for latitude and 0.29 degr. for longitude. The values for source's depth determined by IPC centers (AS GS RAS and SBNC (preliminary variant os seismic bulletin of Northern Caucasus)) and RSCD, are very close and make 19 - 20 km, according to NEIC and CSEM data the source was located within the Earth's crust, and only data of рphp mean that the source was deep in the Earth. We prefer determinations done by IPC and RSCD cause they had information from the nearest stations. Magnitudes MS from data of different centers are stable and make M=5.5-5.6.
     IPC GS RAS also has obtained information with parameters of this event from some seismological centers, these data are given in table 1:
Note: AB - Alarm Service, SBNC - summary bulletin of Northern Caucasus.
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 05-07-10.9 43 46  19        IPC GS RAS (SBNC)
2 05-07-11.5 43 46  25  35  5.6/16 6.5 IPC GS RAS (AS)
3 05-07-14.8 43 46    131