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Location: Eastern side of the main caldera, Okmok volcano, Alaska
Installation Date: July/August 2021 (AVERT project)
Instrumentation:
- Trillium Compact 120 s posthole analogue seismometer
- 24-bit Centaur digitiser (Nanometrics Incorporated)
- Direct burial method at ~1 m depth
- Aligned with true north using compass compensated for magnetic declination
Data Collection:
- Continuous broadband seismic data
- High sensitivity for detecting micro-earthquakes
- Part of permanent monitoring network
Network Role:
- Part of the expanded seismic network at Okmok volcano
- Helps constrain seismic activity within the caldera
- Located inside the caldera to better constrain deformation signals
- Contributes to analog-to-digital upgrade as part of AVO A2D project
Site Characteristics:
- Located on Umnak Island in the central Aleutian Arc
- “Closed-system” volcano with cycles of inflation and deflation
- Currently re-inflating since last eruption in 2008
- Inside caldera location for direct monitoring
Data Access:
Additional Infrastructure:
- Co-located with 3-component fluxgate magnetometer
- Co-located with GNSS antenna
- Part of AVO permanent monitoring network
Monitoring Capabilities:
- Detection of volcano-tectonic earthquakes
- Long-period event monitoring
- Tremor detection and analysis
- Integration with deformation and magnetic monitoring
