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unpredictable. although scientists know which parts of the world are most at risk there is, as yet , no reliable way of pinpointing the precise moment an earthquake will strike. all they can do is increase their understanding of how they occur in the first place. but, as william ellsworth of the united states geological survey explained, this is no easy task. that turns out to be a very tough question. we have some ideas but it s very difficult to get direct evidence. earthquakes occur so deep in the ground we really can t afford to drill there at this point.we d really like to go to an earthquake to understand how it starts but for now we have to use the laboratory. (vo)the world s worst earthquake disaster in recorded history took place in china on the morning of january 23rd 1556. known as the shaanxi earthquake it tore through ten provinces in a great swathe of destruction, wiping out an area more than 500 miles wide. cities, towns and villages were completely obliterate