People in Port-au-Prince said the brief trembler Thursday night was not as strong as several others since the magnitude-7.0 earthquake that devastated the city Jan. 12. Ensuing aftershocks have reached as high as magnitude-5.9.
The U.S. Geological Survey did not immediately have a measurement of the aftershock. Geophysicist Susan Potter said people can feel aftershocks that register as little as magnitude-2.0, but the service has yet to detect anything weaker than a magnitude-4.5 trembler in Haiti, where detection equipment is not densely concentrated.
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