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(googletranslation) After the 3.5 magnitude earthquake yesterday afternoon, Etna seems started a veritable swarm: last night there was a new shock at 21:37 with a magnitude of 2.0 at a depth of 5.6km, then in a night new quake of magnitude 2.1 to 1.2km depth to 0:34, and then again magnitude 2.2 to 9.1km depth to 04:40 followed within a few minutes, at 4:47, a shock stronger, magnitude 2.9 to 3.5km deep, felt by the population.
This earthquake swarm could be linked to the "stress" due to the new volcanic bulge in place, after the deflation that had occurred in recent weeks. The last paroxysm, in fact, it was almost a month ago, on April 27. But perhaps these shocks are signs of a new business coming in the next days ...
Volcanic Riddle: Burst in Mount Etna Eruptions Puzzles Experts
Mount Etna is spitting lava more violently than it has in years, and scientists are baffled as to why. Despite being the world's most-studied volcano, the Sicilian mountain is also its most unpredictable.
The volcano is raging. Fountains of lava, some taller than the Eiffel Tower, shoot from its mouth every few weeks, flowing in red-hot streams into the surrounding valleys. There have been 13 eruptions since the beginning of February.
- American scientists have discovered that some volcanoes 'scream' just before they erupt
- The noise is created by a tremor caused by a swarm of mini earthquakes that precedes this eruption
- The University of Washington believe that a rise in the frequency of earthquakes could be used to predict when eruptions will happen
...researchers also believe that this research and the rise in the frequency of earthquakes and the tremors they cause in the ground could be used to predict future volcanic eruptions.
The study said that it is not unusual for swarms of small earthquakes to precede a volcanic eruption. They can reach a point of such rapid succession that they create a signal called a 'harmonic tremor' that is inaudible to humans as it is such a low frequency. They found that the harmonic tremor rose to substantially higher frequencies and then stopped abruptly just before six of the eruptions.
The awakening of Etna lava ash from the new crater south-east
The activity is not supported by great energy, so much so that experts INGV Catania speak of eruption "is not currently structured." The pyroclastic material issued by the "mouth" falls under the summit area of the highest active volcano in Europe'