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Scientists have detected a flash of light from across the Galaxy so powerful that it bounced off the Moon and lit up the Earth's upper (http://www.everything-science.com/mambots/content/mosinfopop/info.gif)atmosphere (http://www.everything-science.com/javascript:void(0) onmouseover=return overlib('Any gaseous layer surrounding an object such as a planet or moon.', CAPTION, 'atmosphere',BELOW,RIGHT, WIDTH, 300, FGCOLOR, '#CCCCFF', BGCOLOR, '#333399', TEXTCOLOR, '#000000', CAPCOLOR, '#FFFFFF', OFFSETX, 10, OFFSETY, 10); onmouseout=return nd();
  onclick=return overlib('Any gaseous layer surrounding an object such as a planet or moon.', STICKY, CLOSECLICK, CAPTION, 'atmosphere',BELOW,RIGHT, WIDTH, 300, FGCOLOR, '#CCCCFF', BGCOLOR, '#333399', TEXTCOLOR, '#000000', CAPCOLOR, '#FFFFFF', OFFSETX, 10, OFFSETY, 10);). This giant flare was the brightest explosion ever detected from beyond the Solar System. For over a tenth of a second the remarkable . . .

Is it possible that this event was preceded by some sort of gravity wave, and if so, could this have triggered the earthquake that led to the tsunami just a few hours earlier?

Steve W

No, what triggered the earthquake was a fault slippage, a common occurance along fault-lines

Dingo,
 The fault line where the earthquake that triggered the tsunami in the eastern Indian Ocean is a subduction fault, where one plate slides under another, and is marked by a trench.  Q