19 Jul 2009

Aftershocks in Fiordland seen as normal

2:11 pm on 19 July 2009

A seismologist says the growing number of aftershocks, following a magnitude 7.8 earthquake in Fiordland on Wednesday night, is nothing to worry about.

More than 100 aftershocks have since been recorded.

The latest was at 3.33am on Sunday and measured 5.4 on the Richter scale. It was centred about 90km west of Te Anau at a focal depth of 8km.

Wednesday's quake occurred at 9.22pm at a focal depth of 12km. It was followed by another measuring 6.1 at 9.41pm, at a depth of 5km.

The most recent was at 3.30am on Sunday, with a 5.4 magnitude quake centred 90 kilometres west of Te Anau.

GNS seismologist Bill Fry says the aftershocks are becoming weaker and more frequent.

Dr fry says that shows the energy released by the first earthquake is being redistributed and the area is settling down again.