Opera 2015 - Episode 040
(Two seismic events + paroxysm activity)
Event number: 6292591
Magnitude ML 3.8
Date/time:  08-12-2015 - 09:28:31 (UTC)
Area: Catania, Etna Volcano
Coordinates (lat, lon) 37.81, 15.05
Deep: 2 km.

 Event number: 6292741
Magnitude ML 3.2
Date/time:  08-12-2015 - 10:53:55 (UTC)
Area: Catania, Etna Volcano
Coordinates (lat, lon) 37.81, 15.05
Deep: 2 km.

Map taken from Google Map

Seismic events details are reported by INGV:
http://cnt.rm.ingv.it/event/6292591
http://cnt.rm.ingv.it/event/6292741
 

Radioseismic index (RI) and distances :


 
Monitoring St. 03 - ETNA RADIO OBSERVATORY From NICOLOSI (CT), Etna Park, Sicily, S Italy 

Geophone, hourly strips,  6292591 and 6292741 events marked with white vertical arrow on top,  followed by many seismic waves. Paroxysm activity anticipates the two seismic events.


http://www.swpc.noaa.gov/products/notifications-timeline

Intense geomagnetic activity, however it not recognized in such low latitudes such as Sicily. The time of the two event are evidence with two vertical orange line.


http://www.blitzortung.org

Very quite situation on all Europe. Only a small activity in Center Italy, but localized in a very little area.


Monitoring St. 03 - ETNA RADIO OBSERVATORY From NICOLOSI (CT), Etna Park, Sicily, S Italy 

Induction coil,  6292591 and 6292741 events marked with white arrow. Schumann Resonances marked on left part and many main power interharmonics. Local noise, as every day in these hours, evidenced in dashed oval. No RF signals correlated with earthquake event.


Monitoring St. 03 - ETNA RADIO OBSERVATORY From NICOLOSI (CT), Etna Park, Sicily, S Italy 

Induction coil, hourly strips, 6292591 and 6292741 events marked with white arrow. Schumann Resonances are on background, marked also on left part on bottom. No RF signals correlated with earthquake event.

   
Source file, with geophone and induction coil:

Monitoring St. 03 - ETNA RADIO OBSERVATORY From NICOLOSI (CT), Etna Park, Sicily, S Italy 

Source file analyzed with Sonic Visualizer, 1 hours detail focused on first event. Geophone on top, induction coil on bottom. 6292591 event marked with red vertical line. Schumann Resonances on left part. No RF signals correlated with earthquake event.


Monitoring St. 03 - ETNA RADIO OBSERVATORY From NICOLOSI (CT), Etna Park, Sicily, S Italy 

Source file analyzed with Sonic Visualizer, 1 hours detail focused on first event. Geophone on top, induction coil on bottom.  6292741 event marked with vertical red line. Schumann Resonances on left part. No RF signals correlated with earthquake event.

In those days, a strong eruption was taking place, just a few kilometers from our monitoring station:



Here the volcanic tremor as detected by INGV:

http://www.ct.ingv.it/it/tremore-vulcanico.html

And following our recordings.

 Monitoring St. 03 - ETNA RADIO OBSERVATORY From NICOLOSI (CT), Etna Park, Sicily, S Italy 

Geophone on top, induction coil on bottom,  6292591 and 6292741 events marked with two red arrows. Schumann Resonances on left part. Volcanic tremors are evidenced in four rectangle: tremors detected by us coincides with activity recorded by INGV. No RF signals seems to be correlated with volcanic activity.


Monitoring St. 03 - ETNA RADIO OBSERVATORY From NICOLOSI (CT), Etna Park, Sicily, S Italy 

Geophone on top, induction coil on bottom. First volcanic tremor event, 10 hours detail. No RF signals seems to be correlated with volcanic activity.


Monitoring St. 03 - ETNA RADIO OBSERVATORY From NICOLOSI (CT), Etna Park, Sicily, S Italy 

Geophone on top, induction coil on bottom. Second volcanic tremor event, 14 hours detail. Schumann resonances marked on left bottom. No RF signals seems to be correlated with volcanic activity.


Monitoring St. 03 - ETNA RADIO OBSERVATORY From NICOLOSI (CT), Etna Park, Sicily, S Italy 

Geophone on top, induction coil on bottom. Third volcanic tremor event, 15 hours detail. Schumann resonances marked on left bottom. No RF signals seems to be correlated with volcanic activity.
Monitoring St. 03 - ETNA RADIO OBSERVATORY From NICOLOSI (CT), Etna Park, Sicily, S Italy 

Geophone on top, induction coil on bottom. Fourth and longest volcanic tremor event, 58 hours detail. Schumann resonances centre marked on . No RF signals seems to be correlated with volcanic activity.


Two more pictures of the event:


Thermal image detected by INGV monitoring station, and a wonderful long time picture, taken by Marco Restivo.

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