The South Island has rocked and wobbled to more than 20 earthquakes near Hanmer Springs in the past month, but scientists say such a sudden increase in activity is normal. Since September 30, 22 earthquakes and aftershocks have shaken communities across the South Island. Thirteen tremors registered magnitudes of between three and five on the Richter scale – five were … [Read more...] about Cluster of quakes ‘normal’ for Hanmer Springs