Earthquakes near super plumes

[fresh_42]

TL;DR Summary

How far away is safe?

Stromboli had a big eruption and more activity than usual this week. Stromboli is roughly 200 miles apart from the Phlegraean Fields. I ask myself

1. Is it a good sign that geological activities are nearby such that tensions decrease?
2. Is it safe to say that both locations are independent of each other as they are 200 miles apart?
3. Is it especially dangerous because the impacts are getting closer?

 

[Astronuc]

INGV reported that activity at Stromboli had been more intense in the past two weeks with a large explosion on 29 September, short-lived lava overflows of the craters during 3-4 October, and collapses with pyroclastic flows and lava flows on 9 October. At 1524 on 29 September an explosion at vent N2 in Area N (North Crater area) generated an ash plume that rose 300 m above the summit and ejected abundant lava fragments, lapilli, and bombs along the Sciara del Fuoco. Activity during 3-9 October generally consisted of ongoing explosions from three vents in Area N and at least two vents in Area C-S (South-Central Crater area). Low-intensity explosions from the N1 vent (Area N) ejected bombs and lapilli 80-150 m high every 10-20 minutes. Explosions ejecting coarse material, along with sometimes intense spattering, occurred at two N2 vents. Explosions from at least two vents in Area C-S, which were not visible due to the camera views, ejected ash and coarse material less than 150 m above the vent at a rate of 1-6 events per hour. At 1108 on 3 October a fissure opened on the outer flank of N2, within the Sciara del Fuoco, and produced a lava flow that traveled to the coast; the flow was cooling by 1800. At 1107 the next morning, 4 October, lava overflowed the N crater (likely N2) and unconsolidated lava rolled down the upper part of the Sciara del Fuoco.

Activity again intensified on 9 October beginning at 0921 when lava overflowed from an area in the N part of N2 and lava effused from the fissure that had opened on 3 October. At 0922 the rim of N2 collapsed and generated a pyroclastic flow that traveled down the Sciara del Fuoco, reached the sea within 30 seconds, and advanced over the water for a few hundred meters. Immediately afterwards a large amount of lava flowed down the Sciara del Fuoco in two main branches and reached the coast within a few minutes. Lava continued to flow to the coast during the rest of the day. The Dipartimento della Protezione Civile raised the Alert Level to Orange (the second highest level on a four-color scale). Collapses of material in the Sciara del Fuoco continued overnight, possibly due to erosion of the channels from lava flows. By 0919 on 10 October lava flows were only reaching part way down the Sciara del Fuoco, stopping about 400 m from the coast. Lava flows continued to stop part way down the flank during 10-12 October. Frequent collapses of material in the channel eroded by the lava flow and material from the lava flow itself descended to the coast. Spattering from Area N was visible.

https://volcano.si.edu/showreport.cfm?wvar=GVP.WVAR20221005-211040

 

[fresh_42]

Yes, but the Stromboli is more or less no big deal. What does it say about the nearby (200 miles) giant magma chamber beneath the Phlegraean Fields?

Edit: Especially as the Phlegraean Fields themselves have a record of smoothly increasing activities within the last couple of years,

 

[Astronuc]

Edit: Especially as the Phlegraean Fields themselves have a record of smoothly increasing activities within the last couple of years,

Apparently there has been an increase in activity since 2017.

In January 2022, DW posted this - https://www.dw.com/en/europes-super-volcano/av-60510172
The crater surface has been uplifting, and CO levels have increased apparently meaning magma has moved closer to the surface.

https://en.wikipedia.org/wiki/Phlegraean_Fields#More_recent_history

 

[Astronuc]

Slab narrowing in the Central Mediterranean: the Calabro-Ionian subduction zone as imaged by high resolution seismic tomography​

https://www.nature.com/articles/s41598-018-23543-8

If eruptions of the volcanoes in the region have increased, along with seismic activity, then perhaps 'something' is happening.

A paper from 2010 - https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2009TC002599 - describing some of the same area.


I believe that Etna is part of the same system, and Etna has had activity recently.
https://www.volcanodiscovery.com/etna/current-activity.html
https://volcano.si.edu/showreport.cfm?wvar=GVP.WVAR20220615-211060