Indonesia was struck by a very strong 7.5 magnitude earthquake Friday, the US Geological Survey said, and the national disaster agency issued a tsunami warning.

The quake hit central Sulawesi island at a shallow depth of some 10 kilometres (six miles), just hours after a smaller quake killed at least one person in the same part of the country.

Indonesia's disaster agency issued a tsunami warning for the west coast of Sulawesi and east coast of Indonesia's part of Borneo island.