Dhaka, July 3 -- More than 900 earthquakes have shaken a remote and underpopulated island chain in southern Japan over two weeks, keeping residents apprehensive and awake all night.

There have been no reports of damage and no tsunami awareness has been raised but authorities have advised residents to prepare to evacuate if needed.

"It's very scary to even fall asleep," one resident told the regional broadcaster MBC. "It feels like it's always shaking."

The Tokara area has experienced many earthquakes formerly but the frequency of the most recent tremors has been abnormal, according to local media.

Japan is one of the most seismically active nations on Earth as it is located on the so-called Pacific Ring of Fire, where many tectonic pl...