The Canadian Encyclopedia notes a rockslide can move up to 100 km/hr.

E arthquakes are a reminder of the planet’s immense and unpredictable power. While some cause minimal damage, others leave behind widespread destruction and loss. Click through the following gallery ...

Haiyuan County, China (1920) - This earthquake struck on December 16, 1920, in China's Ningxia Province, with a magnitude of between 7.8 and 8.5 on the Richter scale. According to reports, between 200 ...