Information message about seismic process development in Koryak region within last month since main strike on April 20, 2006

     Geophisical Survey of GS RAS reports about continued seismic activity in Koryak region. Within last month since the main strike, which happened on April 20, 2006 with magnitude М=7.8 73 aftershocks with magnitudes М>4.0 have been registered here, two of them with М=7.0 (on April 29 and May 22 мая), three - with М >=5.6 (April 21 at 04:32, April 21 at 11:14, May 9 at 11:02 GMT). Aftershock on May 22 has been felt in nine settlements of Olutorsk region, and in Tilichiki settlement being the nearest to the epicenter with intensity 7-8 on МСК-64 scale.
     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 28 min after registration to the Ministry of Emergency of the Russian Federation (EMERCOM).
     Preliminary processing has been done with data from 46 stations, accurate processing - with data 50 stations.
     Fig. 1 presents fragments of records obtained from digital stations Bilibino (∆ 7.3º),Petropavlovsk (∆ 8.8º), Yakutsk (∆ 17.1º), Tiksi (∆ 18º), Yuzhno-Sakhalinsk (∆ 19.2º), College Outpost (∆ 21.2º). Fig. 2 presents fragments of records obtained from digital stations Borovoe (∆ 48º), Arti (∆ 50º), Ala-Archa (∆ 54.5º), Obninsk (∆ 57.6º), Kislovodsk (∆ 65.8º), Garni (∆ 68.6º).

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 11-11-