Aerial photo taken on Feb. 21, 2019 shows the remains of a church damaged by earthquake in Christchurch, New Zealand. A ceremony was held on Friday in New Zealand's second largest city of Christchurch to mark the 8th anniversary of a devastating quake that claimed 185 lives spanning more than 20 nationalities, including 23 Chinese students. A 6.3-magnitude quake struck the city on Feb. 22, 2011, with a depth of only 4 km. Then-Prime Minister John Key described the disaster as "New Zealand's darkest day." (Xinhua/Guo Lei)