Authorities in Seoul, South Korea, ordered the evacuation of a 39-story office building Tuesday after occupants reported that it shook for about 10 minutes, local media reported.
There was no seismic activity reported at the time of the tremors, which began about 10:10 a.m., according to a report in The Korea Times.
"I fled the building with everyone else while it was shaking up and down. It almost made me feel dizzy," Lim Joon-hee, who works on the 20th floor of the building, told the Yonhap News Agency.
http://news.blogs.cnn.com/2011/07/05/korean-office-tower-evacuated-after-mysterious-shaking/?hpt=hp_t2
Korean office tower evacuated after mysterious shaking - This Just In - CNN.com Blogs