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Russia's Kamchatka Peninsula is on high alert after a series of nine aftershocks were recorded in just one hour. According to the Geophysical Institute of the Russian Academy of Sciences, the tremors ranged from 4.8 to 6.0 on the Richter scale. This is not surprising since the region is located on the famous "ring of fire", the most seismically active region on the planet.
The first tremor, measuring 5.0, struck 350 kilometers from Petropavlovsk-Kamchatsky. This was followed by eight more, the strongest reaching 6.0 on the Richter scale. The epicenters of the earthquakes were located at distances of 200 to 400 kilometers from the city, with focal depths ranging from 10 to 88 kilometers.
In total, more than 125 aftershocks with a magnitude above 4.4 were recorded in the first 16 hours after the main quake, according to the U.S. Geological Survey (USGS). Among them, three particularly strong aftershocks exceeded 6.0, with one of them, a magnitude 6.9, occurring about 45 minutes after the initial quake.
Another aftershock, measuring 6.4 on the Richter scale, was recorded about 320 kilometers southwest of the epicenter of the main earthquake, just before 11:00 a.m. (UTC) on Wednesday.
What do statistical models predict?
Seismologists estimate that the sequence of aftershocks after an earthquake of this magnitude could last for weeks or even months. Based on statistical models, the following are expected:
1 aftershock with magnitude 7.0–7.9 Richter
About 10 aftershocks with magnitude 6.0–6.9 on the Richter scale
Approximately 100 aftershocks with magnitude 5.0–5.9 Richter
Approximately 1,000 aftershocks 4.0–4.9 Richter
The frequency and intensity of subsequent tremors are expected to gradually decrease, however, the region's geodynamic instability could lead to new strong tremors.
Rare earthquakes warn of tension
The most worrying element, as seismologists point out, is that nine days before the main earthquake, two aftershocks with magnitudes of 7.4 and 6.6 were recorded. Such tremors are considered extremely rare as foreshocks and are a clear indicator of the high seismic risk of the area.
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