A PREVIOUSLY unknown active fault may have caused the magnitude-6.3 earthquake in western Japan this weekend, a government committee says.
Twenty-four people were injured and around 1930 houses were damaged by the 0533 quake on Saturday (0633 AEST), which was centred around Awaji Island at a depth of 15 kilometres, the Japan Meteorological Agency said on Sunday.
The active fault is believed to extend about 10 kilometres from north to south in the region, the government earthquake research committee told reporters, the Kyodo News agency reported.
"There are many as yet unrecognised active faults," Yoshimori Honkura, the committee chief, was quoted by Kyodo as saying.
The committee also said 390 aftershocks were recorded in the 25 hours since the main quake and the largest one with a magnitude of 3.8 jolting the area at 5:41 am Saturday.
In 1995, a magnitude-7.3 quake hit the same region, including the city of Kobe, killing more than 6400 people.
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