Information message about the earthquake at the Eastern coast of Kamchatka peninsula on June 16, 2003

     The strong and sensitive earthquake has happened on June 16, 2003 at 22:08 GMT or June 17, 2003 at 02:08 Moscow time at the Eastern coast of Kamchatka peninsula.
     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 2 ÷ 0 min after registration to the Ministry of Emergency of the Russian Federation (EMERCOM).
     Preliminary processing has been done with data from 25 stations, accurate processing - with data 42 stations.
     Figure 1 represents fragments of records from digital stations Petropavlovsk-Kamchatsky (delta 2,5 degrees), Magadan (delta 6.5 degrees), Bilibino (delta 13,0 degrees), South-Sahalinsk (delta 13,7 degrees), Tixi (delta 21 degrees), Talaya (delta 33 degrees). Figure 2 represents fragments of records from digital stations Borovoe (delta 49 degr.), Lovozero (delta 50 degr.), Arti (delta 52 degr.), Obninsk (delta 61 degr.), Kislovodsk (delta 68 degr.), Garni (delta 70 degr.).

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 22-08-03.70 55 159  200  42  6.40/176.50/13 79 IPC GS RAS (accurate)
2 22-08-03.20 55 159  200  25  6.30/96.60/8 133 IPC GS RAS (preliminary)
3 22-08-04.50 55 160  200  379   5.4-6.7  42 CSEM
4 22-08-01.61 55 159  173  167   6.3/89  NEIC (accurate)
5 22-07-46.04 55 159  33  153   6.6/79  NEIC (preliminary)
6 22-08-00.80 55 160  205     6.6   KRIPC
  • 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
  • KRIPC - Regional Informational Processing Center of Kamchatka
    • Epicenter
         Epicenter of the earthquake on June 17 has been located at the Eastern coast of Kamchatka peninsula, in the valley of Storozh river, at the distance of 280 km to the North-East from Petropavlovsk-Kamchatsky and in 130 mk to the South from Kluchi town. Epicenter is associated with Benioff zone.
    Macroseismic manifestations
         The earthquake has been felt in Kamchatka Region: in Ust-kamchatsk and Krutoberegovo – intensity 5 MSK, Petropavlovsk-Kamchatsky - up to 4-MSK, Kluchi – 3 MSK, Elizovo - 2 MSK with use of twelve balls scale MSK-64.
    Historical records
         Locations of the strongest earthquakes of Kamchatka region for the period since 1962 till now are shown on figure 3 in accordance with data from Information site of Kamchatka EMSP of GS RAS. The map has been copied from this site and represents most significant events (with magnitudes from 6.8 to 7.9) happened at peninsula and in it's coastal area. As it is seen the location of reported here event is inside the zone, where within the last 40 years no significant (magnitude) earthquakes have been registered.

    Figure 3
    Focal mechanism and seismic moment of the earthquake
         Fault-plane solution of this earthquake 16.06.2003 has been calculated by CEME GS RAS from first motion of Р-wave arrivals at 147 stations, 26 of them have registered compression waves in initial arrivals (signs "plus"), 121 stations have registered of dilatation waves (signs "minus"). These stations are located in epicentral distance intervals of 2,5-86 degr. at rather uniform dispersion along the azimuth from 4 to 351 degrees. Parameter obtained by IPC GS RAS, as well as Fault-plane solution parameters determined with CMT method in National Earthqakes Information Center of the US Geological Service (NEIC), are presented in table 2 and shown on fig. 4, 5. Fault-plane solutions obtained by different centers are very close to each other. The motion in origin has occured under the action of prevailing stretching forces with almost latitudinal orientation. The type of motion along the plane NP1 of South-East spread direction is characterized by right sided shift (strike slip) and along the plane NP2, having steep falling and North-Eastern spread direction - normal fault.
    Table 2
    Axes of main strengths Nodal planes Center
    T P N NP1 NP2
    Pl Azm Pl Azm Pl Azm Stk Dp Slip Stk Dp Slip
    118458335 2918014242-13717 62-56IPC GS RAS
    249151328 2919513933-15124 74-60NEIC
  • IPC GS RAS - Informational Processing Center, Geophysical Survey, Russian Academy of Sciences
  • NEIC - National Earthquakes Information Center of US Geological Service

    • Figure 4
    Figure 5


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