Information message about the tangible earthquake in the western part of Sakhalin Island on August 14, 2016 |
| The tangible earthquake M=5.6 has occurred on August 14, 2016 at 11:15 GMT (14:15 Moscow time) in the western part of Sakhalin Island. |
| 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 27 stations, accurate processing - with data 51 stations. |
| Fig. 1 presents fragments of records obtained from digital stations Yuzhno-Sakhalinsk (∆ 3.5º), Kurilsk (∆ 6.4º), Yuzhno-Kurilsk (∆ 6.8º), Kuldur (∆ 7º), Severo-Kurilsk (∆ 8.8º). Fig. 2 presents fragments of records obtained from digital stations Bilibino (∆ 21.3º), Tiksi (∆ 22.2º), Norilsk (∆ 31.9º), Makanchi (∆ 38.9º), Arti (∆ 47.3º). |
Figure 1
| 
Figure 2
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|
| 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 |
11-15-14.5 |
50.41 |
142.33 |
25 |
51 |
5.6/23 | 5.8/21 | 6.5 | 43 | IPC GS RAS (Accurate) | | 2 |
11-15-14.2 |
50.51 |
142.08 |
33 |
27 |
| 6.1/12 | 6.5 | | IPC GS RAS (Preliminary) | | 3 |
11-15-15.7 |
50.38 |
142.37 |
20 |
609 |
Mw 5.8 | | | 43 | CSEM | | 4 |
11-15-14.7 |
50.43 |
142.26 |
10 |
191 |
| 5.9/99 | | 83 | 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 the epicenter of this earthquake, its origin was located in the western part of Sakhalin Island, at a depth of 25 km, 56 km S of Aleksandrovsk, 149 km N of Uglegorsk, 166 km S-S-W of Nogliki. |
Figure 3 |
|
| Aftershock |
| GS RAS registered one aftershock М=4.9 in 21 hours after the main shock. It was felt in Aleksandrovsk-Sakhalinskiy, Tymovskoye with intensity 3-4 MSK, in Honore - 3 MSK, in Poronaisk - 2 MSK. |
| 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 |
| 20162921 | 2016-08-15 08:23:07.0 | 50.43 | 142.41 | 10 | 31 | - | 4.9/ 12 | 5-5.5 | Sakhalin, Russia | |
| Macroseismic manifestations |
| According to GS RAS the earthquake was felt in Aleksandrovsk-Sakhalinskiy with intensity 5 MSK, in Uglegorsk - 4 MSK, in Poronaisk, Tymovskoye - 3 MSK, in Nogliki 2-3 MSK. Information on individual responses is collected in the new section of the site, "You feel the earthquake? Tell us about it" (DyfitWeb). |
| Historical records |
| The epicenter of this earthquake was located 220 km S-S-W of tangible earthquake of February 19, 2014 М=5.4 near the north-eastern coast of Sakhalin Island and 150 km S-S-W of tangible earthquake of June 30, 2014 М=5 in the north-eastern part of Sakhalin Island. |
| Focal mechanism and seismic moment of the earthquake |
| Focal mechanism solutions of the origin are presented in fig. 4,5, they were obtained in USGS NEIC with W-phase Moment Tensor (Mww) technique and in Quick CMT Catalog Center, USA with CMT technique. Elements of mechanism are given in table.2. These solutions obtained in different centers are close. The earthquake has occurred under prevailing action of compression stresses oriented S-W (AZ=243º-244º). Nodal plane NP1 is nearly vertical (DP=55º-62º), it strikes S-E (STK=144º-155º). NP2 plane is flat, it strikes N-W (STK=332º-345º). The type of motion – reverse fault for NP1 and thrust for NP2.
According to USGS Mo=4.64 *10**17 N*m, Mw=5.7, according to CMT Catalog – Mo=5.7 *10**17 N*m, Mw=5.8. |
| 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 |
| 76 | 14 | 9 | 243 |
10 | 151 | 144 | 55 | 78 | 345 |
37 | 107 | NEIC | | 73 | 70 | 17 | 245 |
1 | 335 | 156 | 62 | 92 | 332 |
28 | 87 | Quick CMT | |
| NEIC - National Earthquakes Information Center of US Geological Service |
| Quick CMT - Quick CMT catalog |
Figure 4 | 
Figure 5 |
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