Opera 2015 - Episode 015

Event-ID:  4005298341 renamed as (5298251)
Magnitude (Ml): 3.6
Date/time: 20/04/2015 - 01:07:42 (UTC)
Coordinates:   37.797°N, 15.116°E
Deep:  2.7 km
Seismic district: Etna

 
Map taken from Google Map:

Seismic event details are reported by INGV:  http://cnt.rm.ingv.it/event/5298251


Radioseismic index (RI) and distances:



Source files:
Wave file recording by st. 03 - ETNA RADIO OBSERVATORY , from 20APR15-0000  to 20APR15-0400 UTC:
20APR15-0000_coil.wav

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

Geophone, 4005298341 event marked with white arrow. At 05:14 UTC (07:14 local time) starts the local human activity.


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

Induction coil, 4005298341 event marked with white arrow. Schumann resonances marked on Right part. Noise background increasing below 6 Hz, some minutes before but not correlated with earthquake event.


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

Induction coil, hourly multistrip, 4005298341 event marked with white arrow. Schumann resonances marked on Right part. Noise background increasing below 6 Hz, some minutes before but not correlated with earthquake event.


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

Induction coil, daily strips, 4005298341 event marked with white arrow. No RF signals correlated with earthquake event. 1st Schumann resonance marked on left part. Noise background increasing below 6 Hz, some minutes before but not correlated with earthquake event. It is clear that it is a daily local interference, like in the same way during every evening, starting from 18 UTC.

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

Sonic analyzer elaboration of wave source file on top, 4005298341 event marked with white arrows. No RF signals correlated with earthquake event. Here an example how a local daily interference can be wrongly recognized as precursor.

Return to OPERA home page