A 2.8-magnitude earthquake with its epicentre in Deep Bay rattled Shenzhen and Hong Kong at 2.42pm yesterday. The Hong Kong Observatory received more than 100 reports from members of the public, jamming its hotline briefly. Most of the calls were from people living or working in Tuen Mun, Tai Po and Sheung Shui in the New Territories, near Shenzhen. Observatory scientific officer Woo Wang-chun said the tremor was a minor one that lasted a few seconds with at least one aftershock. The epicentre was about 30 kilometres northwest of the Tsim Sha Tsui-based Observatory. One woman working in a Kwai Chung office when the quake hit, said: 'My colleagues and I were petrified for a brief moment before we recovered our composure and realised it was an earthquake.' A Tuen Mun resident said: 'The shake lasted for about two seconds. I thought a train had just passed by but the shake was less intense so I knew it was a quake.' At the Hong Kong Open golf tournament in Fanling, some of the world's top players also felt the tremor. 'I felt it on the 14th tee box and, to be honest, my legs were like jelly over the tee shot,' world No10 Rory McIlroy told Agence France-Presse. '(I've) never felt one of those before.' World No 14 Ian Poulter, the clubhouse leader after the second round, said: 'I bent over on the 14th tee and wondered what it was. I was just about to peg my ball up so I did feel a little tremor. 'It just felt tiny. It was a bit strange but it didn't put me off.' Lawmaker Miriam Lau Kin-yee s aid she felt the tremor when chairing a meeting at the Legislative Council Building. At first she felt dizzy, thinking she may have been ill but later learned that it was a quake. Woo said the quake was the second tremor to hit Hong Kong this year, following one in March. He said Hong Kong had recorded six tremors with epicentres within Hong Kong since 1979 and 57 quakes centred elsewhere that were felt locally. A spokeswoman for Guangdong's Seismological Station said the epicentre originated from a depth of about 23km. Shenzhen authorities released a press release an hour after the quake saying that it had not caused any damage and asked the public to stay calm. In central Shenzhen, thousands of students and white collar workers were evacuated from school and office buildings, fearing a stronger earthquake might follow. An office worker at the Great China International Exchange Square in Futian district said many of his colleagues left the building after the quake, and stayed outdoors for more than half an hour. 'The building shook for about two to three seconds and we left our seats to go downstairs immediately,' he said.