The first earthquake , which struck offshore Poverty Bay on 26 March is estimated to have been between 7 -- 7.1 M .
The first earthquake , which struck offshore Poverty Bay on 26 March is generated a tsunami with a maximum measured run up height of 10 metres .
The first earthquake , which struck offshore Poverty Bay on 26 March is estimated to have been between 7 -- 7.1 M , and generated a tsunami with a maximum measured run up height of 10 metres .