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Iceland's Katla volcano was hit by two swarms of tremors today. The strongest of the first cluster of small harmonic tremors which rattled the glacier was of a 2.9 magnitude.

A second, more intense swarm of tremors erupted shortly thereafter; including two 3.0 magnitude tremors - one inside the caldera of the volcano and one erupted on the parameter under the Mýrdalsjökull glacier.

Unrest at Katla has been intermittent but almost continuous since April. Geologists are monitoring activity at the volcano closely for any changes which could produce a hazardous flood-threat scenario for people living within the vicinity of the summit.

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