A small earthquake hit Shanghai's Baoshan District early yesterday.

With a magnitude of 0.9, it was too small to be felt by humans, the city's seismological bureau said, adding that it didn't receive any reports from residents living in the area.

The bureau reported the earthquake, which took place at 6:38am with the epicenter in Baoshan at a depth of 3 kilometers, on its microblog immediately after detecting it. The bureau said three to four small earthquakes occur in Shanghai each year.