Seismic listening
Fourteen broadband seismometers hear the mountain crack, breathe and settle. We pick every event by hand before it reaches a bulletin.
Volcano observatory, est. 1961
Thirty instruments on the flanks of Kessa, read every minute by a duty team that has not missed a night in sixty-five years.
Tremor RSAM
312
counts · 10 min mean
SO₂ flux
1 840
t / day · DOAS traverse
Summit inflation
+4.2
mm since 1 Sep · GNSS
Crater floor
386
°C max · thermal cam
What we watch
No single signal is a forecast. We read them together, every hour, and only then change a word in the bulletin.
Fourteen broadband seismometers hear the mountain crack, breathe and settle. We pick every event by hand before it reaches a bulletin.
Scanning spectrometers read sulphur dioxide in the plume twice an hour. A rising ratio of CO₂ to SO₂ is often the first word of fresh magma.
GNSS stations and satellite radar measure the summit swelling in millimetres. The volcano inflates like a lung before it speaks.
The network
Every sensor on the mountain reports to a single control room at 1 100 m, staffed around the clock by one analyst and a kettle.
14stations
Broadband and short-period, 100 samples per second, telemetered by radio to the valley.
9GNSS points
Continuous positioning on the flanks plus two tiltmeters bolted to the crater rim.
4spectrometers
Scanning DOAS arrays downwind of the plume, cross-checked by a monthly road traverse.
3cameras
Radiometric infrared on the crater floor, one frame a minute, day and night.
Network uptime · last 365 days
99.62 %
Visit & data
Field nights fund the network. Data partnerships keep it honest. Civil protection gets everything first, always free.
Night at the rim
€42per guest
An evening on the observation deck with a duty volcanologist, the live seismograph and the crater glow through the thermal scope.
Research feed
Most requested€180per month
Raw and processed streams for universities and hazard modellers, with the analyst picks behind every bulletin.
Civil protection
Partnerby agreement
A direct line for the valley municipalities: alert-level changes pushed to your duty officer before they are public.
Bulletins
Tremor steady at elevated background; two shallow long-period events beneath the north vent.
SO₂ flux 1 840 t/day on the evening traverse, up from 1 310 last week. Plume drifting south-east.
Alert level held at 2 (Advisory). Exclusion zone remains 1.5 km from the active crater.
KR-11 seismometer replaced after ash abrasion; the station is back in the network.
Duty line open 24 h
Next field night
Thu 9 Oct
7 of 12 places left · sunset 18:51