Strong earthquakes shake West Papua

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A series of strong inland earthquakes has shaken Indonesia's easternmost province, but there were no immediate reports of serious damage or casualties.

The Indonesian Meteorology, Climatology and Geophysics Agency said at least four land-based earthquakes between 6.2 and 5.5 magnitude were centred 37 kilometres northwest of Central Mamberamo district of West Papua province at a depth up to 16km.

Those earthquakes posed no danger of triggering a tsunami, said Daryono, who heads the Earthquake and Tsunami Mitigation Division.

He said the earthquakes were triggered by a thrust in the Memberamo Anjak fault.

"There is no report on the impact of damage," said Daryono, who goes by a single name.

The US Geological Survey measured the quakes between 6.1 and 5.9 magnitude at a depth of 19-33km. Variations in early measurements are common.

With a population of about 1.2 million, West Papua is one of Indonesia's least-populous provinces.

Indonesia is a seismically active archipelago of 270 million people that is frequently struck by earthquakes, volcanic eruptions and tsunamis.