Two minor earthquakes have occurred in north Donegal in the past 24 hours.

The School of Cosmic Physics at the Dublin Institute for Advanced Studies confirmed the tremors, saying the one recorded last night measured 1.5 on the Richter scale while another this morning measured 1.7.

This brings to three the number of small earthquakes in the county this month.

According to Thomas Blake, Experimental Officer at the Institute, the small tremors are 'natures way of releasing the stresses and strains built up over time in very deep faults.'

Mr Blake stressed that while having a few together is unusual, it is not remarkable.