It's easy to go up but hard to go down: Why can't humans accurately predict earthquakes?

At 14:28 Beijing time on May 12, a 7.8-magnitude earthquake occurred in Wenchuan County, Sichuan (31 degrees north latitude, 103.4 degrees east longitude).

At 14:28 on May 12, Beijing time, a 7.8 magnitude earthquake struck Wenchuan County, Sichuan Province. According to Xinhua News Agency data, as of 18:00 on the 14th, the earthquake had caused 14,962 deaths in eight provinces and municipalities: Sichuan, Gansu, Shaanxi, Chongqing, Yunnan, Shanxi, Guizhou, and Hubei. As the entire nation's military and civilians are urgently engaged in earthquake relief efforts, many people may wonder why this earthquake was not accurately predicted? With today's advanced technology, is it still impossible to accurately forecast earthquakes?