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It is not possible to predict the time and magnitude of an earthquake, but certain places on the Earth know they are always at risk from big tremors. Chile is one of those places.It lies on the "Ring of Fire", the line of frequent quakes and volcanic eruptions that circles virtually the entire Pacific rim. The magnitude 8.8 event that struck the country at 0634GMT on Saturday occurred at the boundary between the Nazca and South American tectonic plates, just off shore and at a depth of about 35km (20 miles).

The Nazca plate, which makes up the Pacific Ocean floor in this region, is being pulled down and under the South American coast. It makes the region one of the most seismically active on the globe. Since 1973, there have been 13 events of magnitude 7.0 or greater.

French and Chilean seismologists had recently completed a study looking at the way the land was moving in response to the strain building up as a result of the tectonic collision. Their analysis suggested the area was ripe for a big quake. "This earthquake fills in an identified seismic gap," Dr Roger Musson, who is the British Geological Survey's Head of Seismic Hazard, told BBC News.

And yet, there's an additional heartache for Haiti in hearing this news. Why was it so much worse here? Chile's quake registered at 8.8, about 500 times more powerful than Haiti's. But the numbers of Haitian dead have already surpassed 220,000 – close to the horrendous toll of the 2004 Indian Ocean tsunami. Chile's dead, at last report, number some 700 – a tragic loss, but orders of magnitude fewer than Haiti's. What explains this deadly disparity?

Where Chile had strict building codes, Haiti suffered from haphazard construction. Poor, rural people had for years flooded into the capital, living in precariously built shantytowns. Lack of enforcement, corruption and weak governance all contributed to grossly magnify the proportions of the catastrophe. It's easy enough to see the exceptions here, which might have been the rule if earthquake-resistant building codes had been enforced: a few solid structures still tower above the rubble – scarred and cracked, to be sure, but standing all the same.

I worry that, as so many times in the past, Haiti will quickly fade from public consciousness, once the world's TV screens are no longer broadcasting terrifying pictures from Port-au-Prince. All the more important that those of us who are working hand in hand with the Haitian people maintain our commitment for the long term, not just with material support but with the determination to rebuild safely and prudently.