Another strong earthquake hit Christchurch at 1.35pm today. The mag 4.2 quake, only 12km deep, was centred 20km east of the city. Geonet described it as “strong” and said it was followed by a smaller 3.8 quake at 2:01pm. Public Id: 2012p713691itNZST: Friday, September 21 2012 at 1:35:03 pm Intensity: strong Depth: 12 km Magnitude:…