Videos that inadvertently caught one of the two powerful aftershocks that struck Christchurch, New Zealand on Monday are surfacing on YouTube, giving just a glimpse of what it's like to experience an earthquake of this magnitude.The two tremors -- a magnitude 5.2 and 6.0, respectively -- damaged several buildings, injured dozens and left almost 50,000 homes without power.In February, a 6.3-magnitude tremor in Christchurch devastated the city and left more than 180 dead.Read More... More on New Zealand Earthquake