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Geotechnical reconnaissance of earthquake damage is performed following major earthquakes worldwide in order to document and assess how large earthquakes affect the land and build infrastructure.
The primary M6.6 tremor of the Niigata Chuetsu Oki (offshore) earthquake occurred at 10:13 a.m local time on July 16, 2007, http://earthquake.usgs.gov/eqcenter/eqinthenews/2007/us2007ewac/#details and was followed by a sequence of aftershocks that were felt during the entire time of the reconnaissance effort.
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