A deep hole has appeared in a hill near the epicenter of the earthquake which on Wednesday shook Dengchen county, Qamdo city of southwest China's Tibet Autonomous Region. The hole has a depth of 20 meters and a diameter of three meters. It was generated due to a land collapse triggered by the earthquake, according to experts. The local department of land resources has conducted an investigation at the site. Rescue workers on Saturday started filling the hole, as the accident site is near a main road which links local villages.