The magnitude 6.7 quake struck 70 miles south of Sapporo on the island of Hokkaido, according to the US Geological Survey (USGS).
Seismic event confirmed. But what was it? An ice quake? An earthquake?
Raises fears the Canary Island's volcano is about to erupt.
With hundreds of tremors daily, authorities have raised the threat level at Mt Agung to its highest, fearing an imminent eruption.
See video of building collapsing (below).
I talk about earthquake lights in Not by Fire but by Ice … and here they are.