Information message about the strong earthquake in Tarapaca, Chile on June 13, 2005.

     The strong earthquake has happened on June 13, 2005 in the Northern Part of Chile, Tarapaca mountain area close to the border with Bolivia at 22:44 GMT with magnitude Đœ=7.5.
     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 1 ÷ 30 min after registration to the Ministry of Emergency of the Russian Federation (EMERCOM).
     Figure 1 presents fragments of records for this earthquake obtained from digital stations Obninsk (delta 115 degrees), Kislovodsk (delta 119 degrees), Bilibino (delta 121 degrees), Arti (delta 127 degrees), Petropavlovsk (delta 131 degrees). Figure 2 presents fragments of records for this earthquake obtained from digital stations Magadan (delta 131 degrees), Yakutsk (delta 136 degrees), Ala-Archa (delta 142 degrees), South-Sakhalinsk (delta 143 degrees), Talaya (delta 148 degrees).

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 22-44-31.60 -19.86 -69.12  100  21  7.50/116.80/17-7.5126 IPC GS RAS (Accurate)
2 22-44-31.3 -20.14 -69.38  100  13  7.4/9 7-7.5143 IPC GS RAS (Preliminary)
3 22-44-27.8 -19.85 -69.33  100  491  7.9Mw   57 CSEM
4 22-44-33.5 -19.9 -69.13  111  184   7.0/124  NEIC (Preliminary)
5 22-44-33.3 -19.9 -69.13  108  211  7.8Mw 6.9/115 29 NEIC (Accurate)
6 22-44-58.0 -13.77 -65.05  30  50   6.5/45 32 ORFEUS
7 22-44-33.54 -19.9 -69.13  111    7.9Mw    SSUCh
  • 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
  • ORFEUS - Observatories and Research Facilities for EUropean Seismology
  • SSUCh - Seismological Service, Departamento de Geopfisica, Universidad de Chile
    • Epicenter
         In accordance with NEIC data epicenter of this earthquake has been located in the zone of subduction of oceanic plate Naska and South American plate known as Peru-Chilean subduction (fig. 3). Subduction in this zone results in numerous earthquakes and volcano activity with active process of mountains formation of Ands. Zones of subduction generate the most significant earthquakes on the planet. The strongest earthquake of the last centuryis the earthquake in Chile in 1960 with magnitude 9.5. It has happened in Peru-Chilean zone of subduction. That earthquake resulted in formation of the earth’s surface rupture with the length of 900 km along the coastline located at the distance of 2000 km to the south from the earthquake on June 13, 2005. Figure 4 shows location of epicenter for the reported here earthquake with one of it’s foreshocks, which was registered on June 8 at 10:50 GMT and one of it’s most significant aftershocks, which was registered at 01:07 GMT with magnitude 4.8. The map has been downloaded from information site of Chilean Seismological Service - http://ssn.dgf.uchile.cl/home/.

    Figure 3
    Figure 4
    Aftershock
         In accordance with NEIC information 5 aftershocks from this earthquake has been registered by June 15 with magnitudes from 4.0 to 4.8 and origin depths from 108 to 130 km. A few preliminary strikes have been registered and they may be considered as foreshocks, the strongest of them were with magnitudes more than 4: 2005/06/08 at 12:50, 2005/06/13 at 00:1 GMT. These foreshocks also had origin depths more than 100 km.
    Macroseismic manifestations
         From ITAR TASS data more than 8 people have been killed and 17 houses destroyed as a result of the earthquake in the North of Chile on June13, 2005.Epicenter of this earthquake has been located in 19 kilometers to the West from Iquique town (fig. 5). From data of Seismological Service of Chilean University this earthquake has been felt in the following points: Iquique – with intensity VI-VII MSK from 12 MSK scale of Merkalli, Tokopilia - VI MSK, Kalama - V-VI MSK, Arica - V, Chakaral , El Salvador - IV-V, Kopiapo, Kaldera - IV, Antofagasta - III-IV MSK. Ministry of emergency situations of Chile obtains more detailed data on the scale of this disaster. "Danger of tsunami is absent, as this earthquake has happened on the continental part", - is said in information message of Hydrographical and Oceanic service of Chilean Navy. Panic among the population has been observed in Arica and Iquique towns, water and electricity supply as well as telephone communication have been interrupted there.

    Figure 5
    Focal mechanism and seismic moment of the earthquake
         Focal mechanism solutions for this earthquake have been obtained from two sources (NEIC and HARVARD) and are presented in table 2 and on figures 6-7 in stereographical projection of the lower hemisphere. These solutions are almost the same as the type of the motion is thrust and the motion in the origin has happened under the action of prevailing strengths of expansion. In both solutions one of the nodal planes NP1 was flat with South Western spread direction. In accordance with NEIC left side drift has been observed along with this thrust. NP2 planes have almost meridional spread directions and steep falling angles equal to 68-75 degrees, the type of motion along them is trap down.
    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
    2510053229 2535723130-33350 75-116NEIC
    238566249 635218623-75350 68-96HARVARD
  • NEIC - National Earthquakes Information Center of US Geological Service
  • HARVARD - Harvard Geophysical Center (USA)

    • Figure 6
    Figure 7


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