John Ristau, a seismologist with GNS Science โ Te Pลซ Ao, said weak to moderate earthquakes were quite common in Marlborough, but to have four measuring ...
* There was [one moderate](https://www.stuff.co.nz/marlborough-express/300813142/magnitude49-earthquake-rocks-top-of-the-south-island) and two weak quakes on February 22 alone.