The graph which shows evidence of a major tremor in Donegal in recent days.
Scientists are trying to determine the cause of a tremor which shook Donegal in recent days.
The investigation follows reports by residents in the Ramelton area of a large bang and then shaking which resulted in doors banging and the ground shaking.
The entire episode lasted around five seconds.
The Irish National Seismic Network have examined the data left by the tremor on April 22nd which is published alongside this article.
Teacher Brendan O'Donoghue, a physics teacher at St Columba's College in Stranorlar, who operates a seisometer, examined the data.
"I used some more sophisticated signal filtering software and isolated this signal. Shaking seems to last for about 5 seconds here in Stranorlar.
"The INSN reports the possible location as Ramelton," he confirmed.
The exact cause of the tremor has still yet to be determined.