High aftershock risk for Haiti in next 30 days: USGS

Jan 22, 2010
A Haitian worker (L) inspects the port in Port-au-Prince on January 22 following the massive 7.0-magnitude quake that shattered the country. Earthquake-hit Haiti faces a high risk of possibly damaging aftershocks for at least 30 days and is set to suffer further tremors for months or even years to come, the US Geological Survey said Friday.

Earthquake-hit Haiti faces a high risk of possibly damaging aftershocks for at least 30 days and is set to suffer further tremors for months or even years to come, the US Geological Survey said Friday.

The capital Port-au-Prince was hit by two fresh aftershocks on Friday, 10 days after the initial 7.0-magnitude quake killed at least 75,000 people and left half a million others homeless.

"The aftershock sequence of the magnitude-7 that struck near Port-au-Prince, Haiti, on January 12, 2010, will continue for months, if not years," the USGS warned in a bulletin on its website.

"The frequency of events will diminish with time, but damaging earthquakes will remain a threat."

There was only a three percent chance of another 7.0-magnitude quake in the next 30 days but there was a 25 percent chance of at least one 6.0-magnitude tremor and a 90 percent likelihood of at least one 5.0-magnitude quake.

Any above 5.0-magnitude will be widely felt and "has the potential to cause additional damage, particularly to vulnerable, already damaged structures," the USGS said.

Nearly 50 aftershocks have rocked Haiti since the initial earthquake, the strongest being a 5.9-magnitude tremor on Wednesday.

The strongest of Friday's new shocks was of magnitude 4.4, the USGS said.

The geological fault responsible for the January 12 is part of a seismic zone located between the American and Carribbean .

Explore further: Radioisotope studies show the continental crust formed 3 billion years ago

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