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We are using Trillium Compact (120s post-hole) seismometers manufactured by Nanometrics. For more information, please see the Nanometrics webpage. The voltage signals output by the analogue seismometers are digitised using the 24-bit Nanometrics Centaur datalogger, which we also use to digitise the signals from our analogue fluxgate magnetometers.
Seismicity captures caldera unrest cycles and eruption precursors.
Seismic monitoring supports eruption detection at one of the Aleutians’ most active volcanoes.
Seismic records capture both volcanic and hydrothermal system activity.

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Example data plots

An example of a drumplot (/helicorder) showing a day of seismic data.
Drum plot showing seismic data at AV.CLNE, an AVO site on Cleveland volcano.