The Rock Doesnt Shift News Today

Calling it 9.0 was a surprise. the fact that there were magnitude up to 7.2fore shocks two days before this earthquake is interesting. fore shocks is something wed like to recognize as an imminent warning of strong earthquakes. we will be studying these earthquakes in detail. jenna: what is a difference between a fore shock, an aftershock and a main shock which we would say is the earthquake. >> the largest event is what we call the main shock, that is the one with the biggest magnitude. because...