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Location: North-eastern flank of Cleveland volcano, Alaska
Installation Date: September 2022 (AVERT project)
Instrumentation:
- NOVAC scanning Differential Optical Absorption Spectrometer (DOAS)
- Motorised sensor head
- Spectrometer sensitive in the UV band
- UV light absorption measurement system
Data Collection:
- Continuous SO2 monitoring during daytime hours
- UV light absorption measurements at specific frequencies
- Spectral transect through volcanic plume
- Comparison with calibrated spectra for concentration determination
Network Role:
- One of two scanning DOAS instruments at Cleveland volcano
- First continuous monitoring of SO2 in the Aleutians
- Provides important constraints on volcanic activity
Site Characteristics:
- Located on the Islands of Four Mountains in the central Aleutian Arc
- “Open-vent” volcano with persistent gas plume
- Located on typical leeward side of Cleveland
- Part of AVERT super-site with dual hut configuration
Data Access:
Additional Infrastructure:
- Co-located with broadband seismometer
- Co-located with visible and IR cameras
- Co-located with 3-component fluxgate magnetometer
- Co-located with meteorological station
- Co-located with GNSS antenna
- Part of AVERT super-site with dual hut configuration
Monitoring Capabilities:
- SO2 concentration measurement in volcanic plume
- Insights into fresh melt introduction to system
- 3-D volume estimation when combined with second DOAS site
- Integration with wind data for plume tracking
- Continuous monitoring of gas emissions
