By Susan Kraemer
There has been an increase in the numbers of earthquakes over 6.0, over the last few years. For the first half decade till 2006, there were about 13 earthquakes a year over 6.0 according to statistics at the USGS (13, 13, 13, 12, 13).
After the Haiti earthquake in 2010, followed by one of the largest earthquakes ever recorded in Chile in January, at 7.1, followed by two averaging 6.7 in February, and also in February a 6.3 in February in New Zealand (in a part of the country not prone to earthquakes), now we have the 9.0 mega quake with a 7.2 aftershock in Japan, in March.
At last yearâ€™s American Geophysical Union meeting geologists were already questioning whether there was a climate change link underlying the increasing frequency of unusually large earthquakes, according toÂ Mathew McDermott at Treehugger. The Haiti earthquake was then just the latest example.