The U.S. Geological Survey estimated its magnitude at 6.8, but the Moroccan geological institute put it at 7.2. That would make it more than twice as large, according to the logarithmic scale on which earthquakes are measured. The U.S. agency said local estimates can often be more accurate, but initial readings of magnitude are measured automatically and need to be reviewed by seismologists. But it was clear that the scope of the catastrophe was extensive, with the rural provinces outside of Marrakesh the hardest hit. Moroccan architects say the area near the epicenter has many earthen houses that are not built to withstand an earthquake of this strength.

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Persons: Omar Farkhani Organizations: Geological Survey, seismologists, United Nations ’ Office, Humanitarian Affairs, UNESCO, of Architects Locations: U.S, Moroccan, Marrakesh, Marrakesh’s Medina