CLES

Cleveland East

Station Information

Location: Eastern flank of Cleveland volcano, Alaska

Installation Date: May 2023 (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 AVO permanent monitoring network

Data Access:

• Data continuously telemetered to AVO
• Archived at Cascades Volcano Observatory
• Available at global NOVAC site (Chalmers University, Sweden)
• Most recent data: https://novac-community.org/data/cleveland

Additional Infrastructure:

• Co-located with broadband seismometer
• Co-located with single infrasound sensor
• Part of AVO permanent monitoring network

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