A magnitude 5.5 quake rocked Christchurch today at 1pm local time, it was followed eight minutes later by a second quake that measured 4.4. Geonet recorded the quake, with the epicentre just off the beach at Sumner. Reference Number 3528810 Universal Time June 13 2011 at 1:00 NZ Standard Time Monday, June 13 2011 at…