The Indonesian authorities issued a tsunami warning after a shallow undersea quake with magnitude of 7.1 struck off Java island of Indonesia early Monday morning.

There has been no immediate report of damage or casualty, officials said.

Indonesia's Meteorology and Geophysics Agency reported that the quake took place at 03:06 am Jakarta time (2006 GMT Sunday) with epicenter at 293 km southwest of Cilacap, Central Java and with the depth at 10 km.

The intensity of the quake was felt at Cilacap of Central Java and Pangandaran of West Java, as well as Denpasar of Bali island and Bogor town near the capital Jakarta, Jajat Jatmika, an official of the agency, told Xinhua by phone.

Head of the disaster management and mitigation agency in Cilacap, Wasi Ariadi, said that many residents fled their homes after the quake happened.

"But there are no houses or buildings damaged, nor are people injured here," he told Xinhua by phone.

The local authorities have prepared temporary shelters at higher ground for the evacuation in the event of tsunami.

In Pangandaran, the authorities urged local people to return home as no tsunami was triggered, Udwala Pranasigit, head of disaster management and mitigation agency in West Java told Xinhua by phone.

Indonesia is in the "Pacific ring of fire", a highly active tectonic zone that frequently experiences earthquakes and volcanic eruptions.