The Feb 22nd earthquake in Christchurch was 6.3 on the Richter scale yet it did much more damage than the 7.1 earthquake on Sept 4th 2010. There are several reasons for this but the main ones are the depth of the epi-centre and the distance from the...
Here are some facts about the earthquake which struck the Canterbury region on Saturday. It measured 7.1 on the Richter scale. At first we were told it was 7.4. That would mean nearly three times stronger. Each 0.2 means double the strength. On avera...
