Information message about the strong earthquake off the Eastern coast of Kamchatka, May 19, 2013 |
| The strong earthquake with M=6.3 has occurred on May 19, 2013 at 18:44 GMT (22:44 Moscow time) off the Eastern coast of Kamchatka. |
| 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 20 min after
registration to the Ministry of Emergency of the Russian Federation (EMERCOM). |
| Preliminary processing has been done with data from 32 stations, accurate processing - with data 51 stations. |
| Fig. 1 presents fragments of records obtained from digital stations Petropavlovsk (∆ 1.4º), Severo-Kurilsk (∆ 3º), Kurilsk (∆ 10.7º), Seimchan (∆ 11.7º), Yuzhno-Kurilsk (∆ 12.6º). Fig. 2 presents fragments of records obtained from digital stations Borovoe (∆ 51.2º), Arti (∆ 54.2º), Obninsk (∆ 63.4º), Kislovodsk (∆ 70.3º), Garni (∆ 72.6º). |
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 |
18-44-09.5 |
52.1 |
160.35 |
33 |
51 |
6.3/30 | 6.2/32 | 7-7.5 | 77 | IPC GS RAS (Accurate) | | 2 |
18-44-13.6 |
52.37 |
160.16 |
33 |
32 |
| 6.4/22 | 6.5-7 | 77 | IPC GS RAS (Preliminary) | | 3 |
18:44:10.0 |
52.299 |
160.202 |
10 |
365 |
| 6.0 | | 71 | CSEM | | 4 |
18:44:10.7 |
52.278 |
160.09 |
16.5 |
102 |
5.9/697 | 5.9/434 | | 96 | NEIC | | 5 |
18:44:08.1 |
52.06 |
160.67 |
39.5 |
|
6.4 | К 13.8 | | | 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 |
| Fig. 3 presents with red star epicenter of this earthqauake which origin was located in Pacific Ocean off the Eastern coast of Kamchatka, at the depth of 33 km, 160 km S-E of Petropavlovsk-Kamchatrsky, 275 km E-N-E of Ozernovsky and 333 km E-N-E of Severo-Kurilsk. |
Figure 3 |
|
| Aftershock |
| GS RAS registered 19 earthquakes with M≥4 since May 18, 2013 when the activation of seismic process started off the Eastern coast of Kamchatka, including 6 foreshocks with М≥5.
Fig.4 presents the map of aftershocks. GS RAS registered 22 aftershocks with M≥4.5 within 6 hours after the main shock. These aftershocks are presented below.
According to GS RAS six aftershocks were felt in Petropavlovsk-Kamchatsky: on May 18 at 19:21 M=5.3, at 19:53 M=5.4, at 23:50 M=5.2 and at 23:51 M=5.7 – intensity 2 MSK, at 20:20 M=5.4 – intensity 2-3 MSK and at 22:38 M=5.6 – intensity 4-5 MSK. |
Figure 4 |
|
| 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 |
| 20131857 | 2013-05-19 19:05:54.0 | 52.06 | 160.51 | 33 | 15 | - | 4.8/ 8 | 3-3.5 | Off east coast of Kamchatka | | 20131872 | 2013-05-19 19:11:19.0 | 52.33 | 160.06 | 50 | 33 | - | 4.5/ 12 | - | Off east coast of Kamchatka | | 20131873 | 2013-05-19 19:11:57.0 | 53.09 | 158.87 | 50 | 23 | - | 5.1/ 12 | 3-3.5 | Near east coast of Kamchatka | | 20131858 | 2013-05-19 19:21:20.0 | 52.06 | 160.66 | 33 | 47 | - | 5.3/ 15 | 4-4.5 | Off east coast of Kamchatka | | 20131859 | 2013-05-19 19:37:24.0 | 52.12 | 160.67 | 33 | 28 | - | 5.3/ 15 | 4-4.5 | Off east coast of Kamchatka | | 20131860 | 2013-05-19 19:43:18.0 | 52.22 | 160.35 | 50 | 30 | - | 5.2/ 12 | 3-3.5 | Off east coast of Kamchatka | | 20131861 | 2013-05-19 19:48:03.0 | 52.11 | 160.45 | 50 | 20 | - | 5.0/ 13 | 3 | Off east coast of Kamchatka | | 20131863 | 2013-05-19 19:51:25.0 | 52.32 | 160.19 | 50 | 26 | - | 5.2/ 14 | 3-3.5 | Off east coast of Kamchatka | | 20131862 | 2013-05-19 19:53:08.0 | 52.23 | 160.04 | 60 | 34 | - | 5.4/ 12 | 3.5-4 | Off east coast of Kamchatka | | 20131865 | 2013-05-19 20:06:52.0 | 52.13 | 160.21 | 70 | 20 | - | 4.9/ 11 | 2-2.5 | Off east coast of Kamchatka | | 20131866 | 2013-05-19 20:15:50.0 | 51.84 | 160.74 | 50 | 15 | - | 4.8/ 7 | 2.5 | Off east coast of Kamchatka | | 20131867 | 2013-05-19 20:20:08.0 | 52.1 | 160.42 | 50 | 30 | - | 5.4/ 13 | 3.5-4 | Off east coast of Kamchatka | | 20131868 | 2013-05-19 21:05:13.0 | 52.16 | 160.49 | 50 | 44 | - | 5.4/ 15 | 3.5-4 | Off east coast of Kamchatka | | 20131869 | 2013-05-19 21:12:54.0 | 52.31 | 159.92 | 60 | 28 | - | 4.9/ 14 | 2-2.5 | Off east coast of Kamchatka | | 20131864 | 2013-05-19 22:38:48.0 | 52.25 | 160.32 | 40 | 43 | - | 5.6/ 20 | 4.5-5 | Off east coast of Kamchatka | | 20131870 | 2013-05-19 22:40:25.0 | 52.26 | 160.1 | 50 | 29 | - | 5.5/ 20 | 4-4.5 | Off east coast of Kamchatka | | 20131871 | 2013-05-19 23:50:16.0 | 52.22 | 159.8 | 50 | 30 | - | 5.2/ 16 | 3-3.5 | Off east coast of Kamchatka | | 20131878 | 2013-05-19 23:51:32.0 | 52.26 | 159.92 | 50 | 24 | - | 5.7/ 13 | 4.5-5 | Off east coast of Kamchatka | | 20131875 | 2013-05-19 23:58:12.0 | 52.3 | 159.87 | 50 | 35 | - | 5.3/ 18 | 3.5-4 | Off east coast of Kamchatka | | 20131876 | 2013-05-20 00:05:00.0 | 52.11 | 160.46 | 50 | 32 | - | 5.1/ 14 | 3-3.5 | Off east coast of Kamchatka | | 20131877 | 2013-05-20 00:13:16.0 | 52.28 | 160.18 | 50 | 48 | - | 6.0/ 18 | 5-5.5 | Off east coast of Kamchatka | | 20131879 | 2013-05-20 00:22:13.0 | 52.4 | 159.93 | 40 | 23 | - | 5.3/ 10 | 4 | Off east coast of Kamchatka | |
| Macroseismic manifestations |
| According to GS RAS the earthquake was felt in Petropavlovsk-Kamchatsky with intensity 3-4 MSK. |
| Historical records |
| Epicenter of this earthquake was located 43 km S-E from epicenter of strong earthquake which occurred on July 30, 2010 M=6.7 |
| Focal mechanism and seismic moment of the earthquake |
| Focal mechanism solution was obtained in IPC GS RAS with signs of initial arrivals of P-waves at 151 stations including 122 stations which registered the waves of compression (plus signs) and 122 stations which registered the waves of extension (minus signs). These stations are located in the interval of epicentral distances of 8–97º and are distributed evenly by the azimuth. Focal mechanism solution in stereographic projection at the lower hemisphere is presented at fig.5, its’ elements are presented in table 2.
Figures 6, 7 present focal mechanism solutions obtained in USGS NEIC with Centroid Moment Solution technique and in Quick CMT Catalog, USA with CMT technique.
All solutions are close. This earthquake has occurred under the action of compression stresses oriented to the south-east. One nodal plane NP1 in all solutions is nearly vertical (DP=58-71º), it strikes north-east (STK=7-39º), another nodal plane is more flat (DP=19-43º) and strikes south-west. The type of motion is uplift for NP1 and thrust for NP2 in all solutions.
Seismic moment of the earthquake was calculated in IPC GS RAS with P-wave spectra obtained at the “Obninsk” station (∆63.44º) Мо=3.0*10**18 N*m, Mw=6.3. According to USGS NEIC Мо=9.3*10**17 N*m, Mw=5.9, according to Quick CMT Мо=1.21*10**18 N*m, Mw=6.0. |
| 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 |
| 64 | 287 | 26 | 119 |
5 | 27 | 25 | 71 | 85 | 220 |
20 | 104 | IPC GS RAS | | 63 | 225 | 8 | 119 |
26 | 25 | 7 | 58 | 59 | 234 |
43 | 130 | NEIC | | 64 | 312 | 26 | 128 |
2 | 219 | 39 | 71 | 92 | 214 |
19 | 85 | 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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