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Etna volcanic tremor

Etna volcanic tremor: current level and live chart

Check Etna's tremor level and trend. The chart updates every 10 minutes from INGV seismic signals and includes recent history.

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Current value
853 nm/s
station ECPN
Trend
decreasing
average 1181 nm/s
HF 4-10 Hz
111 nm/s
level moderate
Updated
09/11, 01:41 AM UTC
Eruptive activity in progress
RMS 0.5-2.5 Hz

Volcanic tremor chart

Live tremor chart· Logarithmic scale · nm/sNanometres per secondMeasures ground oscillation. Quiet: 10–100 nm/s · Moderate: 100–1000 nm/s · High amplitude: >1000 nm/s · INGV source

Volcanic tremor curve

Station
Station index:Ordinary(852.9 nm/s)
🔒 CSV
Bands:Low< 100Moderate100 – 1000High> 1000RMS 10 minaverage 1 hour· Tap the curve for details
Current
852.9 nm/s
Min (7d)
344.7 nm/s
Max (7d)
3802.6 nm/s
Average (7d)
1181.2 nm/s
Samples (range)
966
Updated
1:41:10 AM UTC
nm/s= nanometres per second · measures ground oscillation. Typical quiet range 10–100 · Moderate activity 100–1000 · High amplitude >1000. Tremor alone does not confirm an eruption.
RSAM 4-10 Hz

Complementary HF signal

HF activity · 4–10 Hz
—
RSAM banda 4–10 Hz · HHZ · normalised (relative)Source: INGV FDSN

How EtnaMonitor calculates tremor

INGV FDSN source

The system retrieves raw seismic waveforms from Etna's IV network stations and automatically selects the most reliable active station.

ObsPy processing

The signal is detrended, filtered at 0.5–2.5 Hz and converted to RMS over 10-minute windows, after removing the instrument response when available.

Units: nm/s

Values are nanometres per second: ground velocity. Indicative ranges: quiet 10–100, moderate 100–1000, high activity above 1000 nm/s.

Important note: Tremor is an important technical indicator, but alone it cannot establish an alert or predict an eruption. INGV Osservatorio Etneo remains the official source for volcano monitoring.
Frequently asked questions

What to know

What is a normal tremor level for Mount Etna?

There is no universal normal value. Levels vary by station and period, so the recent baseline and trend are more informative.

Can tremor predict an eruption?

Tremor can reveal escalation, but it cannot reliably predict an eruption by itself.

Where do the tremor data come from?

EtnaMonitor processes public seismic information associated with the INGV Catania monitoring network and clearly identifies the active station.

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