Since mid-April, small earthquakes have been cropping up deep beneath Mount St Helens at ‘relatively high rates,’ bringing roughly one tremor every few hours.

In the last 30 days, scientists have located 55 seismic events in the vicinity, and say there may be well over 100 earthquakes linked to the swarm so far. The activity falls in line with magma recharge thought to be underway since 2008.

Scientists with the Cascades Volcano Observatory and the Pacific Northwest Seismic Network first detected the earthquakes on April 21. Deep snow this past winter left the monitoring sites buried, and knocked out telemetry and power.

But, once everything had been restored to nearly full capacity, the network immediately began picking up signs of small earthquakes at a rate of one quake every few hours.

The scientists have found ‘good evidence’ to suggest this swarm began as early as April 16, and was definitely underway by the 18th.

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