With hundreds still missing, and 75 already confirmed dead, rescuers struggled to find survivors on the second night after a devastating earthquake struck Christchurch, New Zealand's second largest city Tuesday. Buildings crumbled into the streets after the 6.3 magnitude earthquake, which geologists consider an aftershock to a 7.1 earthquake that caused no casualties in September. Tuesdayâs temblor was more devastating and deadly because it was centered only six miles from the city's center and hit during the middle of a workday. The Government has declared a national state of emergency. Officials estimated there could be 100 people trapped in the CTV building alone. -- Lane Turner ( 36 photos total