Monster aftershock could strike within days

The director, Kevin McCue, said there had been more than 100 smaller quakes since Friday, but a larger aftershock was likely. ''Normally they happen within days,'' he said. ''The rule of thumb is that you would expect the main aftershock to be one magnitude smaller than the main shock, so you would be expecting a 7.9. Advertisement: Story continues below ''That's a monster again in its own right that is capable of producing a tsunami and more damage.''