Hypo-theses

The second large earthquake in two days, this time in the Andaman Islands region, at felt around the north east Indian Ocean coastal areas.

This earthquake was unusual in that it had a ‘normal’ faulting mechanism rather that the ‘reverse’ or ‘thrust’ fault mechanism, like the earthquake that which caused the Boxing Day 2004 tsunami. Because [...]

The first of two large earthquakes in two days, this earthquake occurred south of Japan and was felt extensively there. At about 300km depth, there was no chance of a tsunami being generated.

More details from the USGS here.

Part of the Seismometers for Schools Project