Schematic diagram of the updated Tremv routine, including the Tremv-ALERT module.
Figure 4. Graph of the tremor signal preceding the eruption of Hekla on February 26, 2000
for the station closest to Hekla (hau) in three frequency bands, a) 2.0–4.0 Hz,
b) 1.0–2.0 Hz,
c) 0.5–1.0 Hz. Tremor detections by Tremv-ALERT are shown by red lines.
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Each minute, the ALERT module is called by the Tremv
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