Information report about the strong earthquake in the central part of Kuril ridge on January, 13, 2007.

     The strong earthquake with М=8.2 has taken place on January 13, 2007 at 04:23 a.m. GMT (07:23 a.m. Moscow time) in the central part of Kuril ridge. Epicenter of this earthquake was located in 100 kilometers to the east from epicenter of the earthquake on November, 15, 2006
     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 40 min after registration to the Ministry of Emergency of the Russian Federation (EMERCOM).
     Preliminary processing has been done with data from 26 stations, accurate processing - with data 41 stations.
      Figure 1 presents fragments of records obtained from digital stations Petropavlovsk (∆ 7.3º), Yuzhno-Sakhalinsk (∆ 8.1º), Erimo(∆ 9.2º), Magadan(∆ 13.5º), Yakutsk (∆ 21.2º). Figure 2 presents fragments of records obtained from digital stations Arti (∆ 56º), Lovozero (∆ 58º), Obninsk(∆ 66º), Vasula (∆ 67º), Kislovodsk (∆ 72º).

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 04-23-19.4 46.25 154.46  10  41  8.2/197.3/1411.5-1283 IPC GS RAS (Accurate)
2 04-23-18.9 46.22 154.45  10  26  8.1/97.5/711.5-1283 IPC GS RAS (Preliminary)
3 04-23-22.3 46.29 154.56  30  320  8.2Mw   39 CSEM
4 04-23-21.0 46.29 154.45  10  224  8.2Mw 7.3/108 29 NEIC
  • 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
    • Epicenter
         Epicenter of the earthquake on January, 13 2007г. and it’s aftershocks have taken place in the eastern part of aftershock clouds of the strong earthquake on November, 15 2006. On the map (fig. 3) the main shock is shown with red star, and aftershocks registered before 3 p.m. GMT on January 15, 2007 are shown with red circles. Aftershock process of the earthquake on November 15 is shown in the yellow color.

    Figure 3
    Aftershock
         Землетрясение сопровождалось множественными афтершоками. Наиболее сильные приведены ниже:
    N Date   &   Time (GMT)
    yy-mm-dd hh:mm:sec    		 Lat
    degr.    		 Lon
    degr.    		 Depth
    km    		 N
    station    		 Ms/ N mb/ N Io
    calc.    		 Region
    200701032007-01-13 05:27:12.045.98153.693314-5.3/ 74-4.5 East of Kuril Islands
    200701042007-01-13 05:34:40.046.6154.891021-5.2/ 95.5-6 East of Kuril Islands
    200701052007-01-13 05:51:04.045.88154.441014-5.1/ 55.5-6 East of Kuril Islands
    200701062007-01-13 06:06:14.047.39155.431015-5.2/ 95.5-6 East of Kuril Islands
    200701072007-01-13 06:09:49.046.04153.741016-5.3/ 86-6.5 Kuril Islands
    200701082007-01-13 06:44:25.047.39155.111018-5.8/ 77-7.5 East of Kuril Islands
    200701092007-01-13 08:00:53.046.37153.881011-5.3/ 66-6.5 Kuril Islands
    200701102007-01-13 08:14:25.047.45155.331015-5.1/ 85.5-6 East of Kuril Islands
    200701112007-01-13 08:20:24.046.15154.291019-5.7/ 67-7.5 East of Kuril Islands
    200701122007-01-13 08:29:19.046.38154.91020-5.2/ 45.5-6 East of Kuril Islands
    200701132007-01-13 08:55:58.047.96154.71013-5.0/ 55-5.5 Kuril Islands
    200701142007-01-13 09:18:31.045.8153.681030-6.1/ 148 East of Kuril Islands
    200701152007-01-13 09:38:00.047.2156.231018-5.8/ 77-7.5 East of Kuril Islands
    200701172007-01-13 10:58:31.047.32155.641010-5.2/ 55.5-6 East of Kuril Islands
    200701182007-01-13 11:01:36.047.16153.33109-4.9/ 45-5.5 Kuril Islands
    200701192007-01-13 11:29:45.048.4154.671013-4.8/ 54.5-5 Kuril Islands
    200701202007-01-13 12:10:03.046.09153.941011-5.5/ 66.5-7 Kuril Islands
    200701212007-01-13 12:22:19.047.01155.91013-5.1/ 65.5-6 East of Kuril Islands
    200701222007-01-13 12:32:28.047.22155.361014-5.5/ 76.5-7 East of Kuril Islands
    200701232007-01-13 12:53:16.047.34155.421017-5.0/ 75-5.5 East of Kuril Islands
    Macroseismic manifestations
         This earthquake has been felt from Kamchatka to Japan along the all Kuril Islands: in Severo-Kurilsk – with intensity 5-6 MCK, in Kurilsk - with intensity 4-5 MCK, in Petropavlovsk - with intensity 3-4 MCK, in Yuzhno-Kurilsk and Malokurilsk - with intensity 3 MCK of 12 scale МСК-64. The alert of tsunami was announced along all Kuril islands. Nevertheless tsunami did not happen. The alert of tsunami was also sent to Hokkaido, Japan.
    Focal mechanism and seismic moment of the earthquake
          Focal mechanism solutions of the earthquake 13.01.2007 have been calculated with tensor method in NEIC, USA and with tensor method of centroid (TMC) in Harvard Center (HARVARD), USA. They are presented in table 2 and shown on figures 4-5. Both methods used in these different centers demonstrated that the type of motion in the origin was the same – fault (with shift components). However some differences exist. In accordance with NEIC the motion in origin has happened under the action of almost equal forces of compression and expansion oriented to the north. Flat nodal plane NP1 has along meridian direction of propagation, steep falling nodal plane NP2 has latitudinal direction of propagation. The type of motion along NP1 plane – left side shift with vertical components, along NP2 plane – fault with right sided shift components. In accordance with HARVARD the motion in origin has happened under the action of prevailing forces of expansion oriented to the south-east. Both nodal planes have rather steep and equal falling angles to the horizon (DP=40 and DP=58 degr.). Nodal plane NP1 has latitudinal direction of propagation and NP2 plane – north-eastern direction. The type of motion along both planes – the normal fault (for NP1 – with right sided shift components, for NP2 – with left sided shift components). Seismic moment Мо of the earthquake 13.01.2007 has been determined in GS RAS with Р-wave spectra registered by IRIS equipment at seismic stations Talaya (TLY), Arti (ARU), Obninsk (OBN) and Kislovodsk (KIV) located at the distances of 33, 56, 66 and 72 degrees respectively. Averaged value of Мо makes 9.4* 10** 20 n*m . Averaged value of Mw calculated from Kanamori formula makes Мw=7.9. The value of seismic moment Мо from NEIC makes 7.8* 10** 20 n*m, the value of moment magnitude - Mw = 7.9. The value of seismic moment Мо from HARVARD makes 1.65* 10** 21 n*m, the value of moment magnitude - Mw = 8.1.
    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
    3919747347 159434816-1693 86-106NEIC
    1015067264 21564258-114263 40-57HARVARD
  • NEIC - National Earthquakes Information Center of US Geological Service
  • HARVARD - Harvard Geophysical Center (USA)

    • Figure 4
    Figure 5


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