Earthquake prediction attempt fails

A prolonged attempt to help scientists predict when earthquakes will happen has ended in failure, according to a study reported in Nature, the British science weekly.

    Earthquake prediction is said to be the 'Holy Grail of seismology'

    The paper - whose publication on Thursday coincides with the aftermath of the quake that struck Pakistan and India, killing tens of thousands of people - is based on a long-term project in California.

    Scientists sowed a 40km (25-mile) part of the notorious San Andreas fault, at the city of Parkfield, with scores of seismic sensors to monitor earth rumbles and movement in real time.

    But an earthquake measuring 6.0 on the Richter scale struck that region on 28 September 2004 without any warning. There was not the slightest hint of a buildup of strain or impending landslip.

    Parkfield had long been seen as a good test for earthquake physics as it had experienced seven big quakes since 1857, and these events were evenly spaced apart.

    Because of that, the US Geological Survey (USGS) was confident enough in 1985 to predict that a 6.0 quake would occur in Parkfield before 1993.

    Right place, wrong time

    The South Asian quake  killed
    tens of thousands

    As it happened, the USGS was right when it came to predicting the size of the event and the location, and the data sent back by the sensors was invaluable - but its timing was 11 years off.

    In addition, the absence of any precursor signal meant the local population could not be warned in time.

    "Earthquake prediction is the Holy Grail of seismology," says the report, adding: "The 2004 Parkfield earthquake, with its obvious lack of precursors, demonstrates that reliable short-term earthquake prediction is still not achievable."

    Given the huge task of achieving predictability, the study recommends that resources be devoted to improving computer models to help calculate how big a future quake will be and what kind of ground motion it is likely to cause.

    This would have immediate benefit for people living in the vulnerable area and for rescue services.

    Rare accuracy

    One of the most spectacular cases of earthquake prediction was made earlier this year by University of Ulster seismology professor John McCloskey.

    An 8.5-magnitude quake after the
    December tsunami was predicted

    In an analysis of the enormous 26 December quake off Sumatra that caused the Indian Ocean tsunami, McCloskey said the stress had placed additional strain on a weak part of the same fault farther south.

    On 17 March, McCloskey's team warned that a quake of 8.5 magnitude in this newly stressed region was imminent. Eleven days later, an event measuring 8.7 occurred.

    Such accuracy is extremely rare in seismology. McCloskey, like other experts, said he did not want to make predictions about timing because errors bred scepticism and complacency among the public.



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