Information message about the devastating earthquake in central Italy, August 24, 2016 |
| The devastating earthquake М=6.2 has occurred on August 24, 2016 at 01:36 GMT (04:36 Moscow time) in central Italy. |
| 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 33 stations, accurate processing - with data 69 stations. |
| Fig. 1 presents fragments of records obtained from digital stations Apeiranthos of Naxos (∆ 11º), Kaliningrad (∆ 12.7º), Isparta (∆ 14.1º), Anapa (∆ 15.6º), Sochi (∆ 19.3º). Fig. 2 presents fragments of records obtained from digital stations Kislovodsk (∆ 21.4º), Khabaz (∆ 21.6º), Belogornoye (∆ 24.9º), Kirov (∆ 27.4º), Arti (∆ 31.8º). |
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 |
01-36-32.2 |
42.74 |
13.25 |
10 |
69 |
6.2/38 | 6.2/48 | 8.5-9 | 149 | IPC GS RAS (Accurate) | | 2 |
01-36-38.9 |
42.76 |
13.46 |
33 |
33 |
| 6.2/11 | 6-6.5 | | IPC GS RAS (Preliminary) | | 3 |
01-36-32.3 |
42.71 |
13.22 |
4 |
210 |
Mw 6.2 | | | 17 | CSEM | | 4 |
01-36-33.6 |
42.71 |
13.17 |
10 |
123 |
Mw 6.2 | 5.9 | | 35 | 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 central part of Italy at the depth of 10 km, 44 km N-N-W of Aquila, 112 km N-E of Rome and 83 km E-S-E of Perugia. |
Figure 3 |
|
| Aftershock |
| GS RAS registered 10 aftershocks М>=4.4 within 27 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 |
| 20163033 | 2016-08-24 01:56:00.0 | 42.63 | 13.2 | 10 | 30 | - | 4.7/ 17 | 4.5-5 | Central Italy | | 20163035 | 2016-08-24 02:05:57.0 | 42.78 | 13.16 | 10 | 13 | - | 4.4/ 7 | 4 | Central Italy | | 20163034 | 2016-08-24 02:33:28.0 | 42.81 | 13.13 | 10 | 65 | - | 5.7/ 40 | 7-7.5 | Central Italy | | 20163036 | 2016-08-24 02:59:34.0 | 42.72 | 13.18 | 10 | 16 | - | 4.5/ 11 | 4-4.5 | Central Italy | | 20163038 | 2016-08-24 03:40:11.0 | 42.83 | 13.16 | 10 | 16 | - | 4.7/ 10 | 4.5-5 | Central Italy | | 20163039 | 2016-08-24 04:06:52.0 | 42.79 | 13.28 | 10 | 32 | - | 5.0/ 16 | 5-5.5 | Central Italy | | 20163044 | 2016-08-24 11:50:31.0 | 42.98 | 13.3 | 10 | 33 | - | 5.2/ 19 | 5.5-6 | Central Italy | | 20163046 | 2016-08-24 17:46:10.0 | 42.87 | 13.26 | 10 | 26 | - | 4.8/ 15 | 4.5-5 | Central Italy | | 20163049 | 2016-08-25 03:17:16.0 | 42.76 | 13.26 | 10 | 33 | - | 5.0/ 21 | 5-5.5 | Central Italy | | 20163050 | 2016-08-25 04:51:40.0 | 42.93 | 13.24 | 10 | 14 | - | 4.4/ 9 | 4 | Central Italy | |
| Macroseismic manifestations |
| According to ITAR-TASS 297 persons were killed. The worst affected towns were located in the highlands - Amatrice, Pescara del Tronto, Akkumuli. The city center was completely destroyed in Amatrice. It was reported about the damage to buildings, roads and bridges (Fig. 4). Shocks were felt in Rome, Perugia, Rieti, Norcia, Florence and Bologna.
Fig. 5 was obtained from USGS NEIC , it presents USGS Community Internet Intensity Map based on 754 responses in 258 cities. |
Figure 4 | 
Figure 5 |
|
| Historical records |
| Epicenter of this earthquake was located 28 km N-N-W of destructive earthquake of April 6, 2009 М=6.4. On that day 295 persons were killed and 1000 suffered in Aquila town, nearly 50 persents of buildings were destroyed or damaged. |
| Focal mechanism and seismic moment of the earthquake |
| Focal mechanism solution of this earthquake is presented at figure 6 in stereographic projection of the lower hemisphere, elements of this mechanism are given in Table 2. Solutions were obtained in USGS NEIC with W-phase Moment Tensor (Mww) technique. This earthquake has occurred under the action of tensile stresses oriented south-west. Both nodal planes stike along meridian, both of them are dipping under the same angle (DP=43-48º). The motion in origin is characterized as fault with left latteral slip for NP1 and right latteral slip for NP2. According to USGS NEIC – Мо=2.45*10**18N*m, Mw=6.2. |
| 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 |
| 3 | 247 | 81 | 140 |
9 | 337 | 165 | 49 | -78 | 328 |
43 | -103 | NEIC | |
| NEIC - National Earthquakes Information Center of US Geological Service |
Figure 6 |
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