Information message about the strong earthquake in Greece, January 26, 2014. |
| The strong earthquake with M = 6.1 has occurred on January 26, 2014 at 13:55 GMT (17:55 Moscow time) on the island of Kefalonia, Greece. |
| 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 10 min after
registration to the Ministry of Emergency of the Russian Federation (EMERCOM). |
| Preliminary processing has been done with data from 45 stations, accurate processing - with data 54 stations. |
| Fig. 1 presents fragments of records obtained from digital stations Apeiranthos of Naxos (∆ 4.3º), Keskin Array (∆ 10.4º), Malin Array (∆ 13.8º), Kislovodsk (∆ 17.7º), Khabaz (∆ 17.8º). Fig. 2 presents fragments of records obtained from digital stations Obninsk (∆ 20º), Vasula (∆ 20.5º), Pulkovo (∆ 22.4º), Ala-Archa (∆ 40.8º), Zalesovo (∆ 45.7º). |
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 |
13-55-41.5 |
38.35 |
20.4 |
10 |
54 |
6.1/20 | 6.1/24 | 8.5-9 | 155 | IPC GS RAS (Accurate) | | 2 |
13-55-41.1 |
38.36 |
20.36 |
10 |
45 |
| 6.1/24 | 8 | 155 | IPC GS RAS (Preliminary) | | 3 |
13-55-45.0 |
38.22 |
20.39 |
24.1 |
320 |
| 6/45 | | 54 | CSEM | | 4 |
13-55-42.8 |
38.169 |
20.431 |
12.35 |
554 |
Mw 6.1 | | | 36 | 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 |
| Fig. 3 presents with red star epicenter of this earthquake which origin was located on the western Greek island of Kefalonia, at a depth of 10 km, 13 km W of Neokhorion, 16 km N of Lixoúrion and 290 km W-N-W of Athens, the Greek capital. |
Figure 3 |
|
| Aftershock |
| Geophysical Survey registered seven aftershocks M≥4.5 within 8 hours after the main shock. |
| 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 |
| 20140278 | 2014-01-26 14:08:35.0 | 38.2 | 20.22 | 10 | 20 | - | 5.0/ 5 | 5-5.5 | Greece | | 20140279 | 2014-01-26 14:24:01.0 | 38.22 | 20.59 | 10 | 15 | - | 4.7/ 7 | 4.5-5 | Greece | | 20140280 | 2014-01-26 14:59:30.0 | 38.8 | 20.51 | 33 | 19 | - | 4.9/ 14 | 3-3.5 | Greece | | 20140282 | 2014-01-26 18:45:06.0 | 38.48 | 20.2 | 10 | 42 | - | 5.6/ 22 | 6.5-7 | Greece | | 20140283 | 2014-01-26 19:03:07.0 | 38.37 | 20.26 | 10 | 16 | - | 4.5/ 5 | 4-4.5 | Greece | | 20140284 | 2014-01-26 19:12:03.0 | 38.32 | 20.23 | 10 | 24 | - | 4.9/ 12 | 5-5.5 | Greece | | 20140287 | 2014-01-26 21:15:33.0 | 38.29 | 20.01 | 10 | 26 | - | 4.9/ 12 | 5-5.5 | Greece | |
| Macroseismic manifestations |
| According to ITAR-TASS Greek authorities declared a state of emergency on the island of Kefalonia, in many homes of Lixoúrione there are cracks in the walls, damaged roofs and ceilings. The damage is done to the buildings in the nearby island capital Argostoli. The Minister Mr. Yannis Mihelakis said: "There were no casualties in accordance with inital information, only seven people injured, mostly from falling objects during the earthquake".
Fig. 4 presents USGS Community Internet Intensity Map USGS NEIC, based on 31 responses in 24 cities. |
Figure 4 |
|
| Historical records |
| The epicenter was located 40 km N-W of the epicenter of the devastating earthquake of August 12, 1953 M=7.2. |
| Focal mechanism and seismic moment of the earthquake |
| Focal mechanism was obtained in IPC GS RAS with signs of initial arrivals of P waves at 53 stations, including 32 stations which registered the waves of compression (plus signs), and 21 stations which registered the waves of expansion (minus signs). These stations are located in the interval of epicentral distances of 3–91º and 9-355º along the azimuth. Focal mechanism solution in stereographic projection at the lower hemisphere is presented at fig. 5, elements of mechanism are presented in table 2. Fig. 6,7 present focal mechanism solutions of the origin obtained in USGS NEIC based on the method Body-wave Moment Tensor (Mwb) and in Quick CMT Catalog, USA with CMT technique. Both solutions are close.
This earthquake has occurred under the action of close in value compression and expansion stresses oriented south-west and north-north-west respectively. Nodal plane NP1 in both solutions is vertically dipping (DP=86-88º), another plane NP2 in IPC GS RAS solution (DP=48º) is laying more flat than in USGS and Quick CMT (DP=65-80º) solutions. NP1 plane strikes south-east–north-west (STK=119-291º) and NP2 plane strikes north-east (STK=20-25º).
The type of motion along both planes – slip with reverse fault components – left hand slip for NP1 and right hand for NP2.
Seismic moment of the earthquake was obtained in IPC GS RS with Р-waves spectra at «Talaya» station (∆57.28º), Мо=2.2*10**18 N*m and Mw=6.2. According to USGS NEIC – Mo=1.83*10**18 N*m, Mw=6.1, according to Quick CMT Mo=2.04*10**18 N*m, Mw=6.1. |
| 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 |
| 32 | 351 | 25 | 244 |
47 | 124 | 119 | 86 | 43 | 25 |
48 | 174 | IPC GS RAS | | 5 | 336 | 8 | 246 |
80 | 100 | 291 | 88 | -10 | 21 |
80 | -178 | NEIC | | 19 | 339 | 15 | 243 |
65 | 117 | 111 | 87 | 25 | 20 |
65 | 177 | Quick CMT | |
| IPC GS RAS - Informational Processing Center, Geophysical Survey, Russian Academy of Sciences |
| NEIC - National Earthquakes Information Center of US Geological Service |
| Quick CMT - Quick CMT catalog |
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